{"id":70709,"date":"2026-02-02T09:17:25","date_gmt":"2026-02-02T01:17:25","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/70709.html"},"modified":"2026-02-02T09:17:25","modified_gmt":"2026-02-02T01:17:25","slug":"%e7%ac%ac9%e7%ab%a0-%e6%8c%87%e9%92%88","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/70709.html","title":{"rendered":"\u7b2c9\u7ae0 \u6307\u9488"},"content":{"rendered":"

9.1 \u6307\u9488\u7684\u7406\u89e3<\/h3>\n

9.1.1 \u53d8\u91cf\u7684\u8bbf\u95ee\u65b9\u5f0f<\/h4>\n

1\u3001\u76f4\u63a5\u8bbf\u95ee，\u76f4\u63a5\u901a\u8fc7\u53d8\u91cf\u540d\u8fdb\u884c\u8bbf\u95ee
\n2\u3001\u95f4\u63a5\u8bbf\u95ee，\u901a\u8fc7\u6307\u9488\u8fdb\u884c\u8bbf\u95ee<\/p>\n

9.1.2 \u5185\u5b58\u5730\u5740<\/h4>\n

\u4e3a\u4e86\u80fd\u591f\u6709\u6548\u5730\u8bbf\u95ee\u5230\u6bcf\u4e2a\u5185\u5b58\u5355\u5143，\u5c31\u7ed9\u5185\u5b58\u5355\u5143\u8fdb\u884c\u4e86\u7f16\u53f7，\u8fd9\u4e9b\u7f16\u53f7\u88ab\u79f0\u4e3a\u5185\u5b58\u5730\u5740<\/p>\n

32\u4f4d\u7cfb\u7edf，\u5185\u5b58\u5730\u5740\u901a\u5e38\u662f32\u4f4d\u4e8c\u8fdb\u5236\u6570\u5b57，\u53734\u4e2a\u5b57\u8282，\u6700\u5927\u5bfb\u5740232<\/sup>
\n64\u4f4d\u7cfb\u7edf，\u5185\u5b58\u5730\u5740\u901a\u5e38\u662f64\u4f4d\u4e8c\u8fdb\u5236\u6570\u5b57，\u53738\u4e2a\u5b57\u8282，\u6700\u5927\u5bfb\u5740264<\/sup><\/p>\n

9.1.3 \u6307\u9488\u7684\u5b9a\u4e49<\/h4>\n

\u5982\u679c\u4e00\u4e2a\u53d8\u91cf\u4e13\u95e8\u7528\u6765\u5b58\u653e\u5185\u5b58\u5730\u5740，\u5219\u79f0\u4e3a\u6307\u9488\u53d8\u91cf，\u5373\u6307\u9488，\u6307\u9488\u7684\u5b58\u50a8\u5927\u5c0f\u901a\u5e38\u4e0e\u7cfb\u7edf\u7684\u5185\u5b58\u5730\u5740\u5927\u5c0f\u6709\u5173，64\u4f4d\u7cfb\u7edf\u6307\u9488\u7684\u5b58\u50a8\u5927\u5c0f\u4e3a8\u5b57\u8282<\/p>\n

\u6570\u636e\u7c7b\u578b *<\/span>\u6307\u9488\u53d8\u91cf\u540d
\nint<\/span> *<\/span>ptr;<\/span>
\nint<\/span>*<\/span> ptr;<\/span>
\nint<\/span> *<\/span> ptr;<\/span><\/p>\n

\u53d6\u5740\u8fd0\u7b97\u7b26：\u2018&\u2019 ，\u53d6\u51fa\u53d8\u91cf\u7684\u5185\u5b58\u5730\u5740，\u5bf9\u5e94\u7684\u683c\u5f0f\u5360\u4f4d\u7b26 %p
\n\u53d6\u503c\u8fd0\u7b97\u7b26：\u2018*\u2019 ，\u53d6\u51fa\u6307\u9488\u6307\u5411\u7684\u5185\u5b58\u5730\u5740\u91cc\u7684\u503c，\u7528\u5185\u5b58\u5730\u5740\u91cc\u7684\u503c\u5bf9\u5e94\u7684\u683c\u5f0f\u5360\u4f4d\u7b26<\/p>\n

\/\/\u5b9a\u4e49int\u7c7b\u578b\u7684\u53d8\u91cf<\/span>
\nint<\/span> num =<\/span> 5<\/span>;<\/span>
\n\/\/\u5b9a\u4e49\u6b64\u53d8\u91cf\u5bf9\u5e94\u7684\u6307\u9488<\/span>
\nint<\/span> *<\/span>ptr =<\/span> &<\/span>num;<\/span>
\n\/\/\u901a\u8fc7\u53d8\u91cf\u540d\u76f4\u63a5\u8bbf\u95ee\u53d8\u91cf\u7684\u503c\u548c\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"num\u7684\u503c = %d \\\\n"<\/span> ,<\/span> num)<\/span>;<\/span>\/\/5<\/span>
\nprintf<\/span>(<\/span>"num\u7684\u5730\u5740: %p \\\\n"<\/span> ,<\/span> &<\/span>num)<\/span>;<\/span>\/\/\u5b58\u653e\u53d8\u91cfnum\u7684\u5185\u5b58\u5730\u5740<\/span>
\n\/\/\u901a\u8fc7\u6307\u9488\u95f4\u63a5\u8bbf\u95ee\u53d8\u91cf\u7684\u503c\u548c\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"ptr\u6307\u9488\u7684\u503c = %p \\\\n"<\/span> ,<\/span> ptr)<\/span>;<\/span>\/\/\u5b58\u653e\u53d8\u91cfnum\u7684\u5185\u5b58\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"ptr\u6307\u5411\u7684\u503c: %d \\\\n"<\/span> ,<\/span> *<\/span>ptr)<\/span>;<\/span>\/\/\u53d8\u91cfnum\u7684\u503c：5<\/span>
\nprintf<\/span>(<\/span>"\u6307\u9488ptr\u7684\u5730\u5740: %p \\\\n"<\/span> ,<\/span> &<\/span>ptr)<\/span>;<\/span>\/\/\u6307\u9488\u4e5f\u6709\u4e00\u4e2a\u81ea\u5df1\u7684\u5b58\u653e\u5730\u5740<\/span>
\n\/\/\u901a\u8fc7\u53d8\u91cf\u540d\u4fee\u6539\u53d8\u91cf\u503c<\/span>
\nnum =<\/span> 10<\/span>;<\/span>
\n*<\/span>ptr =<\/span> 15<\/span>;<\/span><\/p>\n

9.2 \u6307\u9488\u8fd0\u7b97<\/h3>\n

9.2.1 \u6307\u9488\u52a0\u51cf\u6574\u6570<\/h4>\n

\u6307\u9488\u4e0e\u6574\u6570\u7684\u52a0\u51cf\u8fd0\u7b97，\u8868\u793a\u6307\u9488\u6240\u6307\u5411\u7684\u5185\u5b58\u5730\u5740\u7684\u79fb\u52a8（\u52a0：\u5411\u540e\u79fb\u52a8；\u51cf：\u5411\u524d\u79fb\u52a8），\u6307\u9488\u79fb\u52a8\u591a\u5c11\u548c\u6240\u6307\u5411\u7684\u6570\u636e\u7c7b\u578b\u6709\u5173，int\u7c7b\u578b\u6307\u9488+1\u5411\u540e\u79fb\u52a84\u4e2a\u5b57\u8282<\/p>\n

\/\/\u6570\u7ec4\u5728\u5185\u5b58\u4e2d\u662f\u8fde\u7eed\u5b58\u50a8<\/span>
\nint<\/span> nums[<\/span>]<\/span> =<\/span> {<\/span>10<\/span>,<\/span> 20<\/span>,<\/span> 30<\/span>,<\/span> 40<\/span>,<\/span> 50<\/span>}<\/span>;<\/span>
\n\/\/\u5b9a\u4e49\u6307\u9488，\u6307\u5411\u6570\u7ec4\u7684\u9996\u5143\u7d20<\/span>
\nint<\/span> *<\/span>ptr =<\/span> &<\/span>nums[<\/span>0<\/span>]<\/span>;<\/span>
\nprintf<\/span>(<\/span>"ptr\u7684\u503c: %p \\\\n"<\/span> ,<\/span> ptr)<\/span>;<\/span>\/\/\u5143\u7d2010\u7684\u5185\u5b58\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"ptr\u6307\u5411\u7684\u503c: %d \\\\n"<\/span> ,<\/span> *<\/span>ptr)<\/span>;<\/span>\/\/10<\/span>
\n\/\/ \u6307\u9488\u52a0\u51cf\u6574\u6570 ptr + 1 <\/span>
\nprintf<\/span>(<\/span>"ptr+1\u7684\u503c: %p \\\\n"<\/span> ,<\/span> ptr+<\/span>1<\/span> )<\/span>;<\/span>\/\/\u5143\u7d2020\u7684\u5185\u5b58\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"ptr+1\u6307\u5411\u7684\u503c: %d \\\\n"<\/span> ,<\/span> *<\/span>(<\/span>ptr+<\/span>1<\/span>)<\/span> )<\/span>;<\/span>\/\/20<\/span>
\nptr +=<\/span> 2<\/span>;<\/span>
\nprintf<\/span>(<\/span>"ptr\u7684\u503c: %p \\\\n"<\/span> ,<\/span> ptr)<\/span>;<\/span>\/\/\u5143\u7d2030\u7684\u5185\u5b58\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"ptr\u6307\u5411\u7684\u503c: %d \\\\n"<\/span> ,<\/span> *<\/span>ptr)<\/span>;<\/span>\/\/30<\/span>
\nptr -=<\/span> 1<\/span>;<\/span>
\nprintf<\/span>(<\/span>"ptr\u7684\u503c: %p \\\\n"<\/span> ,<\/span> ptr)<\/span>;<\/span>\/\/\u5143\u7d2020\u7684\u5185\u5b58\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"ptr\u6307\u5411\u7684\u503c: %d \\\\n"<\/span> ,<\/span> *<\/span>ptr)<\/span>;<\/span>\/\/20<\/span><\/p>\n

9.2.2 \u6307\u9488\u81ea\u589e\u81ea\u51cf<\/h4>\n

\u6307\u9488\u81ea\u589e\u3001\u81ea\u51cf\u672c\u8d28\u4e0a\u5c31\u662f\u6307\u9488\u52a0\u51cf\u6574\u6570，\u81ea\u589e\u5730\u5740\u540e\u79fb，\u81ea\u51cf\u5730\u5740\u524d\u79fb\u3002<\/p>\n

\/\/ \u6307\u9488\u81ea\u589e\u81ea\u51cf<\/span>
\n\/\/ \u5b9a\u4e49double\u7c7b\u578b\u7684\u6570\u7ec4<\/span>
\nint<\/span> len =<\/span> 5<\/span>;<\/span>
\ndouble<\/span> nums[<\/span>]<\/span> =<\/span> {<\/span>10.1<\/span>,<\/span> 20.2<\/span>,<\/span> 30.3<\/span>,<\/span> 40.4<\/span>,<\/span> 50.5<\/span>}<\/span>;<\/span>
\n\/\/ \u5b9a\u4e49\u6307\u9488，\u6307\u5411\u6570\u7ec4\u9996\u5143\u7d20<\/span>
\ndouble<\/span> *<\/span>ptr =<\/span> &<\/span>nums[<\/span>0<\/span>]<\/span>;<\/span>
\nprintf<\/span>(<\/span>"ptr\u7684\u503c: %p \\\\n"<\/span> ,<\/span>ptr )<\/span>;<\/span>\/\/\u5143\u7d2010.1\u7684\u5185\u5b58\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"pter\u6307\u5411\u7684\u503c: %.2lf \\\\n"<\/span> ,<\/span> *<\/span>ptr)<\/span>;<\/span>\/\/10.1<\/span>
\n\/\/\u6307\u9488++<\/span>
\nptr++<\/span>;<\/span>
\nprintf<\/span>(<\/span>"ptr\u7684\u503c: %p \\\\n"<\/span> ,<\/span>ptr )<\/span>;<\/span>\/\/\u5143\u7d2020.2\u7684\u5185\u5b58\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"pter\u6307\u5411\u7684\u503c: %.2lf \\\\n"<\/span> ,<\/span> *<\/span>ptr)<\/span>;<\/span>\/\/20.2<\/span>
\n\/\/\u6307\u9488–<\/span>
\nptr—<\/span>;<\/span>
\nprintf<\/span>(<\/span>"ptr\u7684\u503c: %p \\\\n"<\/span> ,<\/span>ptr )<\/span>;<\/span>\/\/\u5143\u7d2010.1\u7684\u5185\u5b58\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"pter\u6307\u5411\u7684\u503c: %.2lf \\\\n"<\/span> ,<\/span> *<\/span>ptr)<\/span>;<\/span>\/\/10.1<\/span>
\n\/\/ \u901a\u8fc7\u6307\u9488\u81ea\u589e\u81ea\u51cf\u904d\u5386\u6570\u7ec4<\/span>
\n\/\/ \u9996\u5143\u7d20<\/span>
\ndouble<\/span> *<\/span>ptr_index =<\/span> &<\/span>nums[<\/span>0<\/span>]<\/span>;<\/span>
\nprintf<\/span>(<\/span>"\\\\n\\\\n\u6b63\u5e8f\u904d\u5386\u6570\u7ec4:\\\\n"<\/span>)<\/span>;<\/span>
\nfor<\/span>(<\/span> int<\/span> i =<\/span> 0<\/span> ;<\/span> i <<\/span> len ;<\/span> i++<\/span>)<\/span>
\n{<\/span>
\n printf<\/span>(<\/span>"%.2lf "<\/span> ,<\/span> *<\/span>ptr_index)<\/span>;<\/span>
\nptr_index ++<\/span>;<\/span>
\n}<\/span>
\nprintf<\/span>(<\/span>"\\\\n\\\\n\u5012\u5e8f\u904d\u5386\u6570\u7ec4:\\\\n"<\/span>)<\/span>;<\/span>
\nfor<\/span>(<\/span> int<\/span> i =<\/span> 0<\/span> ;<\/span> i <<\/span> len ;<\/span> i++<\/span>)<\/span>
\n{<\/span>
\n ptr_index—<\/span>;<\/span>
\n printf<\/span>(<\/span>"%.2lf "<\/span> ,<\/span> *<\/span>ptr_index)<\/span>;<\/span>
\n}<\/span><\/p>\n

9.2.3 \u540c\u7c7b\u578b\u6307\u9488\u76f8\u51cf<\/h4>\n

\u76f8\u540c\u7c7b\u578b\u7684\u6307\u9488\u53ef\u4ee5\u8fdb\u884c\u51cf\u6cd5\u8fd0\u7b97，\u8fd4\u56de\u5b83\u4eec\u4e4b\u95f4\u7684\u8ddd\u79bb，\u5373\u76f8\u9694\u591a\u5c11\u4e2a\u6570\u636e\u5355\u4f4d\u3002\u9ad8\u4f4d\u5730\u5740\u51cf\u53bb\u4f4e\u4f4d\u5730\u5740，\u8fd4\u56de\u7684\u662f\u6b63\u503c；\u4f4e\u4f4d\u5730\u5740\u51cf\u53bb\u9ad8\u4f4d\u5730\u5740，\u8fd4\u56de\u7684\u662f\u8d1f\u503c\u3002<\/p>\n

\u540c\u7c7b\u578b\u6307\u9488\u76f8\u51cf\u7684\u7ed3\u679c\u662f\u4e00\u4e2a ptrdiff_t \u7c7b\u578b\u6570\u636e，ptrdiff_t \u7c7b\u578b\u662f\u4e00\u4e2a\u5e26\u7b26\u53f7\u7684\u6574\u6570，\u683c\u5f0f\u8f93\u51fa\u4e2d\u5bf9\u5e94\u7684\u683c\u5f0f\u5360\u4f4d\u7b26\u662f%td<\/p>\n

\/\/ \u540c\u7c7b\u578b\u6307\u9488\u76f8\u51cf<\/span>
\nint<\/span> nums[<\/span>]<\/span> =<\/span> {<\/span>10<\/span>,<\/span> 20<\/span>,<\/span> 30<\/span>,<\/span> 40<\/span>,<\/span> 50<\/span>}<\/span>;<\/span>
\n\/\/\u5b9a\u4e49\u6307\u9488，\u6307\u5411\u9996\u5143\u7d20<\/span>
\nint<\/span> *<\/span>ptr_first =<\/span> &<\/span>nums[<\/span>0<\/span>]<\/span>;<\/span>
\nprintf<\/span>(<\/span>"ptr_first\u7684\u503c: %p \\\\n"<\/span> ,<\/span> ptr_first )<\/span>;<\/span>\/\/\u5143\u7d2010\u7684\u5185\u5b58\u5730\u5740<\/span>
\n\/\/\u5b9a\u4e49\u6307\u9488，\u6307\u5411\u7b2c\u4e09\u4e2a\u5143\u7d20<\/span>
\nint<\/span> *<\/span>ptr_third =<\/span> &<\/span>nums[<\/span>2<\/span>]<\/span>;<\/span>
\nprintf<\/span>(<\/span>"ptr_third\u7684\u503c: %p \\\\n"<\/span> ,<\/span> ptr_third )<\/span>;<\/span>\/\/\u5143\u7d2030\u7684\u5185\u5b58\u5730\u5740<\/span>
\n\/\/ ptr_third – ptr_first<\/span>
\nptrdiff_t<\/span> tf =<\/span> ptr_third –<\/span> ptr_first ;<\/span>
\nprintf<\/span>(<\/span>"ptr_third – ptr_first\u7684\u503c: %td \\\\n"<\/span> ,<\/span> tf)<\/span>;<\/span> \/\/ 2<\/span>
\n\/\/ ptr_first – ptr_third<\/span>
\nptrdiff_t<\/span> ft =<\/span> ptr_first –<\/span> ptr_third ;<\/span>
\nprintf<\/span>(<\/span>"ptr_first – ptr_third\u7684\u503c: %td \\\\n"<\/span> ,<\/span> ft)<\/span>;<\/span> \/\/ -2<\/span><\/p>\n

9.2.4 \u6307\u9488\u7684\u6bd4\u8f83\u8fd0\u7b97<\/h4>\n

\u6307\u9488\u4e4b\u95f4\u53ef\u4ee5\u8fdb\u884c\u6bd4\u8f83\u8fd0\u7b97，\u5982 ==\u3001<\u3001 <= \u3001 >\u3001 >=，\u6bd4\u8f83\u7684\u662f\u5404\u81ea\u6307\u5411\u7684\u5185\u5b58\u5730\u5740\u7684\u5927\u5c0f，\u8fd4\u56de\u503c\u662f int \u7c7b\u578b\u6574\u6570 1(true)\u6216 0 (false)<\/p>\n

\/\/\u6307\u9488\u6bd4\u8f83\u5927\u5c0f<\/span>
\nint<\/span> nums[<\/span>]<\/span> =<\/span> {<\/span>10<\/span>,<\/span> 20<\/span>,<\/span> 30<\/span>,<\/span> 40<\/span>,<\/span> 50<\/span>}<\/span>;<\/span>\/\/\u6570\u7ec4\u5728\u5185\u5b58\u4e2d\u662f\u8fde\u7eed\u5b58\u50a8\u7684<\/span>
\n\/\/\u5b9a\u4e49\u6307\u9488，\u6307\u5411\u9996\u5143\u7d20<\/span>
\nint<\/span> *<\/span>ptr_first =<\/span> &<\/span>nums[<\/span>0<\/span>]<\/span>;<\/span>
\nint<\/span> *<\/span>ptr_first1 =<\/span> &<\/span>nums[<\/span>0<\/span>]<\/span>;<\/span>
\n\/\/\u5b9a\u4e49\u6307\u9488，\u6307\u5411\u5c3e\u5143\u7d20<\/span>
\nint<\/span> *<\/span>ptr_last =<\/span> &<\/span>nums[<\/span>4<\/span>]<\/span>;<\/span>
\nprintf<\/span>(<\/span>"ptr_first > ptr_last ? %d \\\\n"<\/span> ,<\/span> ptr_first ><\/span> ptr_last)<\/span>;<\/span>\/\/\u5185\u5b58\u5730\u574010\u572850\u524d\u9762：0<\/span>
\nprintf<\/span>(<\/span>"ptr_first < ptr_last ? %d \\\\n"<\/span> ,<\/span> ptr_first <<\/span> ptr_last)<\/span>;<\/span>\/\/\u5185\u5b58\u5730\u574010\u572850\u524d\u9762：1<\/span>
\nprintf<\/span>(<\/span>"ptr_first == ptr_first1? %d \\\\n"<\/span> ,<\/span> ptr_first ==<\/span> ptr_first1)<\/span>;<\/span>\/\/\u90fd\u6307\u541110\u7684\u5185\u5b58\u5730\u5740：0<\/span>
\nprintf<\/span>(<\/span>"ptr_first == (ptr_last-4)? %d \\\\n"<\/span> ,<\/span> ptr_first ==<\/span> (<\/span>ptr_last –<\/span> 4<\/span>)<\/span> )<\/span>;<\/span>\/\/\u90fd\u6307\u541110\u7684\u5185\u5b58\u5730\u5740：0<\/span>
\n\/\/ \u65e0\u610f\u4e49，\u65e0\u6cd5\u786e\u5b9anum1 \u548c num2\u5728\u5185\u5b58\u4e2d\u7684\u5730\u5740，\u5206\u522b\u5b9a\u4e49\u7684\u53d8\u91cf\u5728\u5185\u5b58\u5b58\u50a8\u65f6\u5730\u5740\u4e0d\u4e00\u5b9a\u76f8\u90bb<\/span>
\nint<\/span> num1 =<\/span> 100<\/span>;<\/span>
\nint<\/span> *<\/span>ptr_num1 =<\/span> &<\/span>num1;<\/span>
\nint<\/span> num2 =<\/span> 200<\/span>;<\/span>
\nint<\/span> *<\/span>ptr_num2 =<\/span> &<\/span>num2;<\/span>
\nprintf<\/span>(<\/span>"ptr_num1 > ptr_num2 ? %d \\\\n"<\/span> ,<\/span> ptr_num1 ><\/span> ptr_num2)<\/span>;<\/span><\/p>\n

9.3 \u6307\u9488\u548c\u6570\u7ec4<\/h3>\n

9.3.1 \u6570\u7ec4\u540d\u548c\u6307\u5411\u6570\u7ec4\u9996\u5143\u7d20\u7684\u6307\u9488<\/h4>\n

\u6570\u7ec4\u540d\u5728\u5927\u591a\u6570\u60c5\u51b5\u4e0b\u4f1a\u88ab\u9690\u5f0f\u5730\u8f6c\u6362\u4e3a\u6307\u5411\u6570\u7ec4\u7b2c\u4e00\u4e2a\u5143\u7d20\u7684\u6307\u9488，\u5728\u7279\u5b9a\u60c5\u51b5\u4e0b\u6570\u7ec4\u540d\u53ef\u4ee5\u88ab\u89c6\u4e3a\u4e00\u4e2a\u6307\u9488，\u5177\u6709\u4e00\u4e9b\u6307\u9488\u7684\u7279\u6027\u3002<\/p>\n

\u4e0d\u540c\u70b9：<\/p>\n

1\u3001sizeof \u8fd0\u7b97\u7b26\u8fd4\u56de\u7684\u662f\u6574\u4e2a\u6570\u7ec4\u7684\u5927\u5c0f，\u800c\u6307\u9488\u8fd4\u56de\u7684\u662f\u672c\u8eab\u7684\u5927\u5c0f<\/p>\n

int<\/span> nums[<\/span>5<\/span>]<\/span> =<\/span> {<\/span>10<\/span>,<\/span> 20<\/span>,<\/span> 30<\/span>,<\/span> 40<\/span>,<\/span> 50<\/span>}<\/span>;<\/span>
\nint<\/span> *<\/span>ptr =<\/span> &<\/span>nums[<\/span>0<\/span>]<\/span>;<\/span>\/\/\u5b9a\u4e49\u6307\u9488，\u6307\u5411\u6570\u7ec4\u9996\u5143\u7d20<\/span>
\nprintf<\/span>(<\/span>"sizeof\u8ba1\u7b97nums\u7684\u5b58\u50a8\u5927\u5c0f: %zu \\\\n"<\/span> ,<\/span> sizeof<\/span> nums )<\/span>;<\/span> \/\/20<\/span>
\nprintf<\/span>(<\/span>"sizeof\u8ba1\u7b97ptr\u7684\u5b58\u50a8\u5927\u5c0f: %zu \\\\n"<\/span> ,<\/span> sizeof<\/span> ptr)<\/span>;<\/span> \/\/ 8<\/span><\/p>\n

2\u3001\u6570\u7ec4\u540d\u4e0d\u80fd\u8fdb\u884c\u81ea\u589e\u3001\u81ea\u51cf\u8fd0\u7b97<\/p>\n

3\u3001\u6570\u7ec4\u540d\u672c\u8d28\u662f\u6807\u8bc6\u7b26\u5e38\u91cf，\u4e0d\u80fd\u66f4\u6539；\u6307\u9488\u672c\u8d28\u4e0a\u662f\u53d8\u91cf，\u53ef\u4ee5\u4fee\u6539<\/p>\n

\u76f8\u540c\u70b9：\u2014\u2014(\u5c06\u6570\u7ec4\u540d\u5f53\u6210\u6307\u9488\u5bf9\u5f85)<\/p>\n

\u672c\u8d28\u4e0a：
\n1\u3001\u6570\u7ec4\u540d\u52a0\u4e0b\u6807\u672c\u8d28\u4e0a\u5c31\u662f\u6307\u9488\u7684\u89e3\u5f15\u7528
\nnum[0] == (nums + 0) == ptr[0] == (ptr + 0) \u90fd\u8868\u793a\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u7684\u503c
\n2\u3001\u6570\u7ec4\u540d\u3001\u6307\u9488\u540d\u548c\u5bf9\u6570\u7ec4\u5143\u7d20\u53d6\u5740\u90fd\u80fd\u8868\u793a\u5143\u7d20\u7684\u5730\u5740
\nnums == ptr == &nums[0] \u90fd\u8868\u793a\u6570\u7ec4\u7684\u5730\u5740<\/p>\n

1\u3001\u901a\u8fc7 %p \u683c\u5f0f\u5316\u8f93\u51fa\u5730\u5740<\/p>\n

printf<\/span>(<\/span>"ptr\u7684\u503c: %p \\\\n"<\/span> ,<\/span> ptr)<\/span>;<\/span>\/\/\u8f93\u51fa\u4e3a\u6570\u7ec4nums\u7b2c\u4e00\u4e2a\u5143\u7d20\u7684\u5185\u5b58\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"nums\u7684\u503c: %p \\\\n"<\/span> ,<\/span> nums)<\/span>;<\/span>\/\/\u8f93\u51fa\u4e3a\u6570\u7ec4nums\u7b2c\u4e00\u4e2a\u5143\u7d20\u7684\u5185\u5b58\u5730\u5740<\/span><\/p>\n

2\u3001\u90fd\u53ef\u4ee5\u901a\u8fc7\u89e3\u5f15\u7528\u8f93\u51fa\u6570\u7ec4\u4e2d\u7684\u5143\u7d20<\/p>\n

printf<\/span>(<\/span>"ptr\u6307\u5411\u7684\u503c: %d \\\\n"<\/span> ,<\/span> *<\/span>ptr)<\/span>;<\/span>\/\/10<\/span>
\nprintf<\/span>(<\/span>"nums\u6307\u5411\u7684\u503c: %d \\\\n"<\/span> ,<\/span> *<\/span>nums)<\/span>;<\/span>\/\/10<\/span><\/p>\n

3\u3001\u90fd\u53ef\u4ee5\u901a\u8fc7\u52a0\u51cf\u8fd0\u7b97\u5207\u6362\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u5730\u5740\u548c\u503c<\/p>\n

\/\/\u8f93\u51fa\u90fd\u662f\u6570\u7ec4\u4e2d\u7b2c\u4e8c\u4e2a\u5143\u7d20\u7684\u5730\u5740\u548c\u503c<\/span>
\nprintf<\/span>(<\/span>"ptr+1\u7684\u503c: %p , ptr+1\u6307\u5411\u7684\u503c: %d \\\\n"<\/span> ,<\/span> ptr +<\/span> 1<\/span>,<\/span> *<\/span>(<\/span>ptr+<\/span>1<\/span>)<\/span>)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"nums+1\u7684\u503c: %p , nums+1\u6307\u5411\u7684\u503c: %d \\\\n"<\/span> ,<\/span> nums +<\/span> 1<\/span>,<\/span> *<\/span>(<\/span>nums+<\/span>1<\/span>)<\/span>)<\/span>;<\/span> <\/p>\n

4\u3001\u90fd\u53ef\u4ee5\u7528\u4e8e\u8868\u793a\u6570\u7ec4\u4e2d\u7684\u5143\u7d20<\/p>\n

\/\/\u4ee5\u4e0b\u65b9\u5f0f\u90fd\u53ef\u4ee5\u8f93\u51fa\u6570\u7ec4\u4e2d\u7684\u7b2c\u4e09\u4e2a\u5143\u7d20<\/span>
\nprintf<\/span>(<\/span>"nums[2]\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20: %d \\\\n"<\/span> ,<\/span> nums[<\/span>2<\/span>]<\/span>)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"ptr[0]\u6570\u7ec4\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20: %d \\\\n"<\/span> ,<\/span> ptr[<\/span>2<\/span>]<\/span>)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"*(ptr+2)\u53d6\u6570\u7ec4\u7684\u5143\u7d20: %d \\\\n"<\/span> ,<\/span> *<\/span>(<\/span>ptr +<\/span> 2<\/span>)<\/span> )<\/span>;<\/span>
\nprintf<\/span>(<\/span>"*(nums+2)\u53d6\u6570\u7ec4\u7684\u5143\u7d20: %d \\\\n"<\/span> ,<\/span> *<\/span>(<\/span>nums +<\/span> 2<\/span>)<\/span> )<\/span>;<\/span><\/p>\n

9.3.2 \u6307\u9488\u6570\u7ec4<\/h4>\n

\u6307\u9488\u6570\u7ec4：\u662f\u4e2a\u6570\u7ec4，\u6570\u7ec4\u4e2d\u7684\u6bcf\u4e00\u4e2a\u5143\u7d20\u90fd\u662f\u6307\u9488（\u5b58\u50a8\u6307\u9488\u7684\u6570\u7ec4）<\/p>\n

\/\/ \u82e5\u4f7f\u7528\u4e8c\u7ef4\u5b57\u7b26\u6570\u7ec4，\u5fc5\u987b\u660e\u786e\u884c\u548c\u5217，\u800c\u4e14\u6bcf\u4e00\u884c\u7684\u957f\u5ea6\u5fc5\u987b\u76f8\u540c<\/span>
\n\/\/ \u4f7f\u7528\u6307\u9488\u6570\u7ec4，\u7ef4\u62a4\u4e0d\u540c\u957f\u5ea6\u7684\u5b57\u7b26\u4e32(\u5b57\u7b26\u6570\u7ec4)<\/span>
\nchar<\/span> str1[<\/span>]<\/span> =<\/span> "ShenZhen1"<\/span>;<\/span>
\nchar<\/span> str2[<\/span>]<\/span> =<\/span> "ShangHaiHai1"<\/span>;<\/span>
\nchar<\/span> str3[<\/span>]<\/span> =<\/span> "BeiJingTianAnMen1"<\/span>;<\/span>
\nchar<\/span> str4[<\/span>]<\/span> =<\/span> "WuHan1"<\/span>;<\/span>
\n\/\/ \u5b9a\u4e49\u6307\u9488\u6570\u7ec4<\/span>
\nchar<\/span> *<\/span>citys2[<\/span>]<\/span> =<\/span> {<\/span> str1 ,<\/span> str2 ,<\/span> str3 ,<\/span> str4}<\/span>;<\/span>
\nfor<\/span>(<\/span> int<\/span> i=<\/span> 0<\/span> ;<\/span>i <<\/span> 4<\/span> ;<\/span> i ++<\/span>)<\/span>
\n{<\/span>
\n printf<\/span>(<\/span>"%s \\\\n"<\/span> ,<\/span> citys2[<\/span>i]<\/span>)<\/span>;<\/span>
\n}<\/span>
\nprintf<\/span>(<\/span>"citys2\u7684\u5b58\u50a8\u957f\u5ea6: %zu \\\\n"<\/span> ,<\/span> sizeof<\/span> citys2)<\/span>;<\/span><\/p>\n

9.3.3 \u6570\u7ec4\u6307\u9488<\/h4>\n

\u6570\u7ec4\u6307\u9488：\u662f\u4e2a\u6307\u9488，\u6307\u5411\u4e00\u4e2a\u6570\u7ec4（\u6307\u5411\u7684\u662f\u6574\u4e2a\u6570\u7ec4）<\/p>\n

int<\/span> arr[<\/span>5<\/span>]<\/span> =<\/span> {<\/span>10<\/span>,<\/span> 20<\/span>,<\/span> 30<\/span>,<\/span> 40<\/span>,<\/span> 50<\/span>}<\/span>;<\/span>
\n\/\/int *ptr = &arr[0];\/\/\u5b9a\u4e49\u6307\u9488，\u6307\u5411\u6570\u7ec4\u9996\u5143\u7d20，\u6307\u9488\u7684\u7c7b\u578b\u662f：int *<\/span>
\nint<\/span> (<\/span>*<\/span>ptr)<\/span>[<\/span>5<\/span>]<\/span> =<\/span> &<\/span>arr;<\/span>\/\/\u5b9a\u4e49\u6570\u7ec4\u6307\u9488，\u6307\u5411 int [5] \u7c7b\u578b，\u6307\u9488\u7684\u7c7b\u578b：int *[5]<\/span>
\n\/\/\u904d\u5386\u6570\u7ec4，\u53d6\u6570\u7ec4\u4e2d\u7684\u5143\u7d20<\/span>
\nfor<\/span>(<\/span> int<\/span> i =<\/span> 0<\/span> ;<\/span>i <<\/span> 5<\/span> ;<\/span> i ++<\/span>)<\/span>
\n{<\/span>
\nprintf<\/span>(<\/span>"arr\u6307\u9488\u53d6\u6570\u7ec4\u7684\u5143\u7d20: %d \\\\n"<\/span> ,<\/span> arr[<\/span>i]<\/span>)<\/span>;<\/span> \/\/ *(arr + i)<\/span>
\nprintf<\/span>(<\/span>"ptr\u6307\u9488\u53d6\u6570\u7ec4\u7684\u5143\u7d20: %d \\\\n"<\/span>,<\/span> (<\/span>*<\/span>ptr)<\/span>[<\/span>i]<\/span>)<\/span>;<\/span> \/\/ *((*ptr) + i)<\/span>
\nprintf<\/span>(<\/span>"ptr\u6307\u9488\u53d6\u6570\u7ec4\u7684\u5143\u7d20: %d \\\\n"<\/span>,<\/span> *<\/span>(<\/span>(<\/span>*<\/span>ptr)<\/span> +<\/span> i)<\/span>)<\/span>;<\/span>
\n}<\/span><\/p>\n

arr[i] == (*arr + i) == (ptr)[i] == ((*ptr) + i)<\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

9.3.4 \u5b57\u7b26\u6307\u9488<\/h4>\n

\u5b57\u7b26\u6307\u9488，\u662f\u4e00\u4e2a\u6307\u9488，\u53ef\u4ee5\u6307\u5411\u4e00\u4e2a\u666e\u901a\u5b57\u7b26，\u4e5f\u53ef\u4ee5\u6307\u5411\u4e00\u4e2a\u5b57\u7b26\u4e32(\u5b57\u7b26\u6570\u7ec4)<\/p>\n

1\u3001\u5b57\u7b26\u6307\u9488\u662f\u53ef\u53d8\u7684，\u5141\u8bb8\u4f7f\u7528\u4e0b\u9762\u65b9\u6cd5\u91cd\u65b0\u8d4b\u503c，\u6307\u5411\u65b0\u7684\u5b57\u7b26\u4e32\u3002\u800c\u5b57\u7b26\u6570\u7ec4\u4e0d\u5141\u8bb8\u91cd\u65b0\u8d4b\u503c，\u53ea\u5141\u8bb8\u5bf9\u6570\u7ec4\u4e2d\u7684\u5143\u7d20\u8fdb\u884c\u5355\u72ec\u91cd\u65b0\u8d4b\u503c<\/p>\n

\/\/ \u5b9a\u4e49\u5b57\u7b26\u6307\u9488，\u6307\u5411\u5b57\u7b26\u4e32\u5e38\u91cf(\u5b57\u9762\u91cf)<\/span>
\nchar<\/span> *<\/span>ptr =<\/span> "How Are You"<\/span>;<\/span>
\nptr =<\/span> "How Old Are You?"<\/span>;<\/span>\/\/\u6307\u9488\u672c\u8eab\u7684\u503c\u53ef\u4ee5\u4fee\u6539<\/span>
\n\/\/ \u5b9a\u4e49\u5b57\u7b26\u6570\u7ec4(\u5b57\u7b26\u4e32)<\/span>
\nchar<\/span> arr[<\/span>12<\/span>]<\/span> =<\/span> "Hello World"<\/span>;<\/span>
\narr[<\/span>0<\/span>]<\/span> =<\/span> 'L'<\/span>;<\/span>\/\/\u53ea\u80fd\u5355\u72ec\u5bf9\u5404\u4e2a\u5143\u7d20\u8fdb\u884c\u91cd\u65b0\u8d4b\u503c<\/span><\/p>\n

9.4 \u6307\u9488\u548c\u51fd\u6570<\/h3>\n

9.4.1 \u503c\u4f20\u9012\u548c\u6307\u9488\u4f20\u9012<\/h4>\n

1\u3001\u503c\u4f20\u9012: \u5c06\u5b9e\u53c2\u7684\u503c\u4f20\u9012\u7ed9\u51fd\u6570\u7684\u5f62\u53c2\u3002\u53ef\u4ee5\u7406\u89e3\u4f4d\u5c06\u5b9e\u53c2\u7684\u503c\u62f7\u8d1d\u4e00\u4efd\u4f20\u9012\u7ed9\u51fd\u6570\u7684\u5f62\u53c2\u3002\u5b9e\u53c2\u672c\u6765\u7684\u503c\u548c\u51fd\u6570\u4e2d\u5f62\u53c2\u7684\u503c\u6ca1\u6709\u5173\u7cfb\u3002\u5728\u51fd\u6570\u5185\u6539\u53d8\u53c2\u6570\u7684\u503c，\u4e0d\u5f71\u54cd\u51fd\u6570\u5916\u9762\u539f\u672c\u5b9e\u53c2\u7684\u503c<\/p>\n

2\u3001\u6307\u9488\u4f20\u9012: \u5c06\u5b9e\u53c2\u7684\u5730\u5740\u4f20\u9012\u7ed9\u51fd\u6570\u7684\u5f62\u53c2\u3002\u5b9e\u53c2\u672c\u6765\u7684\u5730\u5740\u548c\u51fd\u6570\u4e2d\u5f62\u53c2\u7684\u5730\u5740\u662f\u4e00\u6837\u7684，\u6307\u5411\u7684\u540c\u4e00\u4e2a\u6570\u636e\u3002\u5728\u51fd\u6570\u5185\u6539\u53d8\u53c2\u6570\u7684\u503c，\u4f1a\u6539\u53d8\u51fd\u6570\u5916\u9762\u539f\u672c\u5b9e\u53c2\u7684\u503c<\/p>\n

9.4.2 \u6307\u9488\u51fd\u6570<\/h4>\n

\u5982\u679c\u51fd\u6570\u7684\u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u6307\u9488，\u8fd9\u6837\u7684\u51fd\u6570\u79f0\u4e3a\u6307\u9488\u51fd\u6570，\u8fd4\u56de\u503c\u4e0d\u80fd\u6307\u5411\u5c40\u90e8\u53d8\u91cf<\/p>\n

\u8bed\u6cd5：\u8fd4\u56de\u7c7b\u578b *\u6307\u9488\u51fd\u6570\u540d(\u53c2\u6570\u5217\u8868)<\/p>\n

int<\/span> *<\/span>func<\/span>(<\/span>)<\/span>
\n{<\/span>
\n \/\/ int n = 100; \/\/ \u5c40\u90e8\u53d8\u91cf, \u5728func\u8fd4\u56de\u65f6，\u5c31\u4f1a\u9500\u6bc1<\/span>
\n \/\/ \u5982\u679c\u8fd9\u4e2a\u5c40\u90e8\u53d8\u91cf\u662fstatic\u6027\u8d28\u7684，\u90a3\u4e48n\u5b58\u653e\u6570\u636e\u7684\u7a7a\u95f4\u5728\u9759\u6001\u6570\u636e\u533a<\/span>
\nstatic<\/span> int<\/span> n =<\/span> 100<\/span>;<\/span>
\nreturn<\/span> &<\/span>n;<\/span>
\n}<\/span>
\nint<\/span> main<\/span>(<\/span>)<\/span>
\n{<\/span>
\n int<\/span> *<\/span>p =<\/span> func<\/span>(<\/span>)<\/span>;<\/span>
\n int<\/span> n =<\/span> *<\/span>p;<\/span>
\n printf<\/span>(<\/span>"value=%d"<\/span>,<\/span> n)<\/span>;<\/span>
\n return<\/span> 0<\/span>;<\/span>
\n}<\/span><\/p>\n

9.4.3 \u51fd\u6570\u6307\u9488（\u6307\u5411\u51fd\u6570\u7684\u6307\u9488）<\/h4>\n

\u51fd\u6570\u6307\u9488：\u662f\u4e2a\u6307\u9488，\u6307\u5411\u4e00\u4e2a\u51fd\u6570<\/p>\n

\u51fd\u6570\u540d\u5728\u8868\u8fbe\u5f0f\u4e2d\u6709\u65f6\u4e5f\u4f1a\u88ab\u8f6c\u6362\u4e3a\u8be5\u51fd\u6570\u6240\u5728\u5185\u5b58\u533a\u57df\u7684\u9996\u5730\u5740，\u8fd9\u548c\u6570\u7ec4\u540d\u975e\u5e38\u7c7b\u4f3c<\/p>\n

\u8bed\u6cd5：\u8fd4\u56de\u7c7b\u578b (*\u51fd\u6570\u6307\u9488\u540d)(\u53c2\u6570\u5217\u8868)<\/p>\n

\u6ce8\u610f：()\u7684\u4f18\u5148\u7ea7\u9ad8\u4e8e*，\u7b2c\u4e00\u4e2a\u62ec\u53f7\u4e0d\u80fd\u7701\u7565，\u5982\u679c\u7701\u7565，\u5c31\u6210\u4e86\u6307\u9488\u51fd\u6570\u3002<\/p>\n

\/\/\u5b9a\u4e49\u51fd\u6570，\u6c42\u4e24\u4e2a\u6570\u7684\u5e73\u5747\u503c<\/span>
\ndouble<\/span> get_avg<\/span>(<\/span>int<\/span> a,<\/span> int<\/span> b)<\/span>
\n{<\/span>
\n return<\/span> (<\/span>a +<\/span> b)<\/span> \/<\/span> 2.0<\/span>;<\/span>
\n}<\/span><\/p>\n

\/\/ \u4f7f\u7528%p\u683c\u5f0f\u5316\u8f93\u51fa\u7ed3\u679c\u90fd\u4e00\u6837，\u90fd\u662f\u8f93\u51fa\u51fd\u6570\u6240\u5728\u5730\u5740<\/span>
\nprintf<\/span>(<\/span>"get_avg\u7684\u503c: %p \\\\n"<\/span> ,<\/span> get_avg)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"*get_avg\u7684\u503c: %p \\\\n"<\/span> ,<\/span> *<\/span>get_avg)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"&get_avg\u7684\u503c: %p \\\\n"<\/span> ,<\/span> &<\/span>get_avg)<\/span>;<\/span>
\n\/\/ \u76f4\u63a5\u4f7f\u7528\u51fd\u6570<\/span>
\ndouble<\/span> result1 =<\/span> get_avg<\/span>(<\/span>10<\/span>,<\/span>20<\/span>)<\/span>;<\/span>\/\/\u76f4\u63a5\u4f7f\u7528\u51fd\u6570\u540d\u8c03\u7528<\/span>
\nprintf<\/span>(<\/span>"result1 = %.2lf \\\\n"<\/span> ,<\/span> result1)<\/span>;<\/span>\/\/15.00<\/span>
\n\/\/\u901a\u8fc7\u51fd\u6570\u6307\u9488\u8c03\u7528，\u663e\u5f0f\u5730\u89e3\u5f15\u7528\u4e86\u51fd\u6570\u6307\u9488，\u7f16\u8bd1\u5668\u4f1a\u5ffd\u7565\u8fd9\u4e2a\u89e3\u5f15\u7528\u64cd\u4f5c，\u4ecd\u7136\u5c06\u5176\u89c6\u4e3a\u51fd\u6570\u8c03\u7528\u3002<\/span>
\ndouble<\/span> result2 =<\/span> (<\/span>*<\/span>get_avg)<\/span>(<\/span>10<\/span>,<\/span>20<\/span>)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"result2 = %.2lf \\\\n"<\/span> ,<\/span> result2)<\/span>;<\/span>\/\/15.00<\/span>
\n\/\/\u901a\u8fc7\u53d6\u5730\u5740\u7b26\u8c03\u7528，\u51fd\u6570\u540d\u672c\u8eab\u5df2\u7ecf\u662f\u4e00\u4e2a\u6307\u9488，\u56e0\u6b64 &get_avg \u548c get_avg \u662f\u7b49\u4ef7\u7684\u3002<\/span>
\ndouble<\/span> result3 =<\/span> (<\/span>&<\/span>get_avg)<\/span>(<\/span>10<\/span>,<\/span>20<\/span>)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"result3 = %.2lf \\\\n"<\/span> ,<\/span> result3)<\/span>;<\/span>\/\/15.00<\/span>
\n\/\/ \u5b9a\u4e49\u51fd\u6570\u6307\u9488，\u6307\u5411get_avg\u51fd\u6570\u3002get_avg\u7684\u6570\u636e\u7c7b\u578b: double(int,int)<\/span>
\n\/\/ \u5b9a\u4e49\u6307\u9488，\u6307\u5411double(int,int)\u7c7b\u578b\u51fd\u6570，\u6307\u9488\u7684\u7c7b\u578b: double *(int,int)<\/span>
\n\/\/\u51fd\u6570\u540dget_avg\u672c\u8eab\u5c31\u662f\u4e00\u4e2a\u51fd\u6570\u540d，\u6240\u4ee5*get_avg\u3001&get_avg\u548cget_avg\u7b49\u4ef7<\/span>
\ndouble<\/span> (<\/span>*<\/span>fun_ptr1)<\/span>(<\/span>int<\/span>,<\/span>int<\/span>)<\/span> =<\/span> get_avg;<\/span>
\ndouble<\/span> (<\/span>*<\/span>fun_ptr2)<\/span>(<\/span>int<\/span>,<\/span>int<\/span>)<\/span> =<\/span> *<\/span>get_avg;<\/span>
\ndouble<\/span> (<\/span>*<\/span>fun_ptr3)<\/span>(<\/span>int<\/span>,<\/span>int<\/span>)<\/span> =<\/span> &<\/span>get_avg;<\/span>
\n\/\/ \u4f7f\u7528\u51fd\u6570\u6307\u9488，\u8c03\u7528\u51fd\u6570<\/span>
\ndouble<\/span> d1 =<\/span> fun_ptr1<\/span>(<\/span>10<\/span>,<\/span>20<\/span>)<\/span>;<\/span>
\ndouble<\/span> d2 =<\/span> fun_ptr2<\/span>(<\/span>10<\/span>,<\/span>20<\/span>)<\/span>;<\/span>
\ndouble<\/span> d3 =<\/span> fun_ptr3<\/span>(<\/span>10<\/span>,<\/span>20<\/span>)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"d1 = %.2lf \\\\n"<\/span> ,<\/span> d1 )<\/span>;<\/span>\/\/15.00<\/span>
\nprintf<\/span>(<\/span>"d2 = %.2lf \\\\n"<\/span> ,<\/span> d2 )<\/span>;<\/span>\/\/15.00<\/span>
\nprintf<\/span>(<\/span>"d3 = %.2lf \\\\n"<\/span> ,<\/span> d3 )<\/span>;<\/span>\/\/15.00<\/span><\/p>\n

9.4.4 \u56de\u8c03\u51fd\u6570<\/h4>\n

\u56de\u8c03\u51fd\u6570\u5c31\u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488\u8c03\u7528\u7684\u51fd\u6570，\u5c31\u662f\u5c06\u51fd\u6570\u4f5c\u4e3a\u53c2\u6570\u4f20\u5165\u53e6\u4e00\u4e2a\u51fd\u6570\u4e2d<\/p>\n

\/\/\u5b9a\u4e49\u51fd\u6570，\u5b9e\u73b0\u4e24\u4e2a\u6574\u6570\u7684\u8ba1\u7b97, \u8fd4\u56de\u8ba1\u7b97\u7ed3\u679c, \u8ba1\u7b97\u7684\u65b9\u5f0f\u7531\u8c03\u7528\u8005\u6765\u51b3\u5b9a<\/span>
\n\/\/`int (*cpt)(int,int)`\u662f\u51fd\u6570\u6307\u9488<\/span>
\nint<\/span> compute_2_num<\/span>(<\/span> int<\/span> num1,<\/span> int<\/span> num2 ,<\/span> int<\/span> (<\/span>*<\/span>cpt)<\/span>(<\/span>int<\/span>,<\/span>int<\/span>)<\/span> )<\/span>
\n{<\/span>
\n \/\/ \u8c03\u7528\u56de\u8c03\u51fd\u6570\u5b8c\u6210\u4e24\u4e2a\u6574\u6570\u7684\u8ba1\u7b97<\/span>
\n return<\/span> cpt<\/span>(<\/span>num1,<\/span> num2)<\/span>;<\/span>
\n}<\/span>
\nint<\/span> add<\/span>(<\/span>int<\/span> num1,<\/span> int<\/span> num2)<\/span>\/\/\u52a0<\/span>
\n{<\/span>
\n return<\/span> num1 +<\/span> num2;<\/span>
\n}<\/span>
\nint<\/span> sub<\/span>(<\/span>int<\/span> num1,<\/span> int<\/span> num2)<\/span>\/\/\u51cf<\/span>
\n{<\/span>
\n return<\/span> num1 –<\/span>num2;<\/span>
\n}<\/span>
\nint<\/span> mul<\/span>(<\/span>int<\/span> num1,<\/span> int<\/span> num2)<\/span>\/\/\u4e58<\/span>
\n{<\/span>
\n return<\/span> num1 *<\/span> num2;<\/span>
\n}<\/span>
\nint<\/span> div<\/span>(<\/span>int<\/span> num1 ,<\/span> int<\/span> num2)<\/span>\/\/\u9664<\/span>
\n{<\/span>
\n return<\/span> num1 \/<\/span> num2;<\/span>
\n}<\/span>
\nint<\/span> main<\/span>(<\/span>)<\/span>
\n{<\/span>
\n\/\/\u901a\u8fc7\u8fc7\u6539\u53d8\u4f20\u5165compute_2_num\u51fd\u6570\u7684\u56de\u8c03\u51fd\u6570，\u6765\u6539\u53d8\u51fd\u6570\u7684\u529f\u80fd<\/span>
\n \/\/int result = compute_2_num(100,200 ,add);<\/span>
\n \/\/int result = compute_2_num(100,200,sub);<\/span>
\n \/\/int result = compute_2_num(100,200,mul);<\/span>
\n int<\/span> result =<\/span> compute_2_num<\/span>(<\/span>100<\/span>,<\/span>200<\/span>,<\/span>div)<\/span>;<\/span>
\n printf<\/span>(<\/span>"result = %d \\\\n"<\/span> ,<\/span> result)<\/span>;<\/span>
\n return<\/span> 0<\/span>;<\/span>
\n}<\/span><\/p>\n

9.5 \u591a\u7ea7\u6307\u9488<\/h3>\n

\u6307\u5411\u6307\u9488\u7684\u6307\u9488，\u591a\u7ea7\u95f4\u63a5\u5bfb\u5740\u7684\u5f62\u5f0f，\u6216\u8005\u8bf4\u662f\u4e00\u4e2a\u6307\u9488\u94fe<\/p>\n

\"\u5728\u8fd9\u91cc\u63d2\u5165\u56fe\u7247\u63cf\u8ff0\"<\/p>\n

1\u3001\u58f0\u660e\u591a\u7ea7\u6307\u9488<\/p>\n

int<\/span> *<\/span>ptr;<\/span>\/\/\u4e00\u7ea7\u6307\u9488<\/span>
\nint<\/span> *<\/span>*<\/span>ptr;<\/span>\/\/\u4e8c\u7ea7\u6307\u9488<\/span>
\nint<\/span> *<\/span>*<\/span>*<\/span>ptr;<\/span>\/\/\u4e09\u7ea7\u6307\u9488<\/span><\/p>\n

2\u3001\u521d\u59cb\u5316\u591a\u7ea7\u6307\u9488<\/p>\n

int<\/span> var;<\/span>
\nint<\/span> *<\/span>ptr =<\/span> &<\/span>var;<\/span>\/\/\u4e00\u7ea7\u6307\u9488\u6307\u5411 var<\/span>
\nint<\/span> *<\/span>*<\/span>pptr =<\/span> &<\/span>ptr;<\/span>\/\/\u4e8c\u7ea7\u6307\u9488\u6307\u5411 ptr<\/span>
\nint<\/span> *<\/span>*<\/span>*<\/span>ppptr =<\/span> &<\/span>pptr;<\/span>\/\/\u4e09\u7ea7\u6307\u9488\u6307\u5411 pptr<\/span>
\nprintf<\/span>(<\/span>"Value of var: %d\\\\n"<\/span>,<\/span> var)<\/span>;<\/span>
\nprintf<\/span>(<\/span>"Value of ptr: %d\\\\n"<\/span>,<\/span> *<\/span>ptr)<\/span>;<\/span> \/\/ \u89e3\u5f15\u7528\u4e00\u6b21<\/span>
\nprintf<\/span>(<\/span>"Value of pptr: %d\\\\n"<\/span>,<\/span> *<\/span>*<\/span>pptr)<\/span>;<\/span> \/\/ \u89e3\u5f15\u7528\u4e24\u6b21<\/span>
\nprintf<\/span>(<\/span>"Value of ppptr: %d\\\\n"<\/span>,<\/span> *<\/span>*<\/span>*<\/span>ppptr)<\/span>;<\/span> \/\/ \u89e3\u5f15\u7528\u4e09\u6b21<\/span><\/p>\n

9.6 \u7a7a\u6307\u9488<\/h3>\n

\u8d4b\u4e3aNULL \u503c\u7684\u6307\u9488\u88ab\u79f0\u4e3a\u7a7a\u6307\u9488，NULL \u662f\u4e00\u4e2a\u5b9a\u4e49\u5728\u6807\u51c6\u5e93 <stdio.h>\u4e2d\u7684\u503c\u4e3a\u96f6\u7684\u5b8f\u5e38\u91cf<\/p>\n

\u58f0\u660e\u6307\u9488\u53d8\u91cf\u7684\u65f6\u5019，\u5982\u679c\u6ca1\u6709\u786e\u5207\u7684\u5730\u5740\u8d4b\u503c，\u4e3a\u6307\u9488\u53d8\u91cf\u8d4b\u4e00\u4e2a NULL \u503c\u662f\u4e00\u4e2a\u597d\u7684\u7f16\u7a0b\u4e60\u60efint \\\\*p \\\\= NULL;<\/p>\n

9.7 \u91ce\u6307\u9488<\/h3>\n

\u91ce\u6307\u9488\u5c31\u662f\u6307\u9488\u6307\u5411\u7684\u4f4d\u7f6e\u4e0d\u53ef\u77e5（\u968f\u673a\u6027\u3001\u4e0d\u6b63\u786e\u3001\u6ca1\u6709\u660e\u786e\u9650\u5236\u7684）<\/p>\n

\u539f\u56e0：
\n1\u3001\u6307\u9488\u4f7f\u7528\u524d\u672a\u521d\u59cb\u5316\u2014\u2014int *p
\n2\u3001\u6307\u9488\u8d8a\u754c\u8bbf\u95ee
\n3\u3001\u6307\u9488\u6307\u5411\u5df2\u91ca\u653e\u7684\u7a7a\u95f4（\u6bd4\u5982\u6307\u9488\u6307\u5411\u5c40\u90e8\u53d8\u91cf）<\/p>\n\n\u53d8\u91cf\u5b9a\u4e49\u7c7b\u578b\u8868\u793a\u542b\u4e49<\/tr>\n\n\n\n\n\n\n\n\n\n\n
int i<\/td>\nint<\/td>\ni \u662f\u4e00\u4e2a\u6574\u578b\u53d8\u91cf<\/td>\n<\/tr>\n
int *p<\/td>\nint *<\/td>\np \u662f\u4e00\u4e2a\u6307\u5411\u6574\u578b\u6570\u636e\u7684\u6307\u9488<\/td>\n<\/tr>\n
int a[5]<\/td>\nint [5]<\/td>\na \u662f\u4e00\u4e2a5\u4e2a\u5143\u7d20\u7684\u6574\u578b\u6570\u7ec4<\/td>\n<\/tr>\n
int *p[4]<\/td>\nint *[4]<\/td>\np \u662f\u4e00\u4e2a\u6307\u9488\u6570\u7ec4，\u6bcf\u4e2a\u5143\u7d20\u90fd\u662f\u6307\u5411\u6574\u578b\u6570\u636e\u7684\u6307\u9488<\/td>\n<\/tr>\n
int (*p)[4]<\/td>\nint (*)[4]<\/td>\np \u662f\u4e00\u4e2a\u6570\u7ec4\u6307\u9488，\u6307\u5411\u4e00\u4e2a4\u4e2a\u5143\u7d20\u7684\u6574\u578b\u6570\u7ec4<\/td>\n<\/tr>\n
int f()<\/td>\nint ()<\/td>\nf \u662f\u4e00\u4e2a\u8fd4\u56de\u6574\u578b\u6570\u636e\u7684\u51fd\u6570<\/td>\n<\/tr>\n
int *f()<\/td>\nint *()<\/td>\nf \u662f\u4e00\u4e2a\u6307\u9488\u51fd\u6570，\u8fd4\u56de\u6307\u5411\u6574\u6570\u6570\u636e\u7684\u6307\u9488<\/td>\n<\/tr>\n
int (*p)()<\/td>\nint (*)()<\/td>\np \u662f\u4e00\u4e2a\u51fd\u6570\u6307\u9488，\u6307\u5411\u4e00\u4e2a\u8fd4\u56de\u6574\u578b\u6570\u636e\u7684\u51fd\u6570<\/td>\n<\/tr>\n
int **p<\/td>\nint **<\/td>\np \u662f\u4e00\u4e2a\u6307\u5411\u6307\u9488\u7684\u6307\u9488<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"

9.1 \u6307\u9488\u7684\u7406\u89e3
\n9.1.1 \u53d8\u91cf\u7684\u8bbf\u95ee\u65b9\u5f0f
\n1\u3001\u76f4\u63a5\u8bbf\u95ee，\u76f4\u63a5\u901a\u8fc7\u53d8\u91cf\u540d\u8fdb\u884c\u8bbf\u95ee
\n2\u3001\u95f4\u63a5\u8bbf\u95ee，\u901a\u8fc7\u6307\u9488\u8fdb\u884c\u8bbf\u95ee
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