{"id":111654,"date":"2026-10-01T14:16:50","date_gmt":"2026-10-01T06:16:50","guid":{"rendered":"https:\/\/www.wsisp.com\/helps\/111654.html"},"modified":"2026-10-01T14:16:50","modified_gmt":"2026-10-01T06:16:50","slug":"c-%e7%ac%ac-15-%e8%af%be%ef%bc%9a%e6%8c%87%e9%92%88-%e5%92%8c%e5%9c%b0%e5%9d%80","status":"publish","type":"post","link":"https:\/\/www.wsisp.com\/helps\/111654.html","title":{"rendered":"C++ \u7b2c 15 \u8bfe\uff1a\u6307\u9488 * \u548c\u5730\u5740 &"},"content":{"rendered":"

\u4e0a\u4e00\u8bfe\u6807\u51c6\u7b54\u6848：<\/p>\n

  • \u6700\u7ec8\u8f93\u51fa：<\/li>\n

    20<\/p>\n

    \u56e0\u4e3a：<\/p>\n

    void change(int& a)<\/p>\n

    \u4e2d\u7684 a \u662f x \u7684\u5f15\u7528，\u4fee\u6539 a \u5c31\u662f\u5728\u4fee\u6539\u539f\u6765\u7684 x\u3002<\/p>\n

  • <\/li>\n

    x = 30
    \ny = 30<\/p>\n

    \u56e0\u4e3a：<\/p>\n

    int& y = x;<\/p>\n

    \u8868\u793a y \u662f x \u7684\u522b\u540d，\u5b83\u4eec\u5bf9\u5e94\u540c\u4e00\u4e2a\u53d8\u91cf\u3002<\/p>\n

  • \u672c\u8d28\u533a\u522b：<\/li>\n

    void test(int a)<\/p>\n

    \u662f\u503c\u4f20\u9012：<\/p>\n

    \u628a\u539f\u53d8\u91cf\u7684\u503c\u590d\u5236\u4e00\u4efd\u7ed9 a，\u4fee\u6539 a \u4e0d\u5f71\u54cd\u539f\u53d8\u91cf\u3002<\/p>\n

    \u800c：<\/p>\n

    void test(int& a)<\/p>\n

    \u662f\u5f15\u7528\u4f20\u9012：<\/p>\n

    a \u76f4\u63a5\u5f15\u7528\u539f\u53d8\u91cf，\u4fee\u6539 a \u4f1a\u4fee\u6539\u539f\u53d8\u91cf\u3002<\/p>\n

  • \u6700\u540e：<\/li>\n

    joint1 = 0.0<\/p>\n

    \u56e0\u4e3a：<\/p>\n

    setZero(joint1);<\/p>\n

    \u628a joint1 \u901a\u8fc7\u5f15\u7528\u4f20\u8fdb\u51fd\u6570，\u51fd\u6570\u91cc\u7684：<\/p>\n

    angle = 0.0;<\/p>\n

    \u76f4\u63a5\u4fee\u6539\u4e86 joint1\u3002<\/p>\n

    \n

    \u7b2c 15 \u8bfe：\u6307\u9488 * \u4e0e\u5730\u5740 &<\/h2>\n

    \u8fd9\u8282\u662f C++ \u91cc\u7b2c\u4e00\u4e2a\u771f\u6b63\u5bb9\u6613\u7ed5\u6655\u4eba\u7684\u77e5\u8bc6\u70b9\u3002<\/p>\n

    \u4f46\u6211\u4eec\u4e0d\u80cc\u5b9a\u4e49\u3002<\/p>\n

    \u6211\u4eec\u5148\u56de\u7b54\u4e00\u4e2a\u6700\u57fa\u7840\u7684\u95ee\u9898：<\/p>\n

    \u53d8\u91cf\u5230\u5e95\u653e\u5728\u54ea\u91cc？<\/p>\n

    \n

    1. int x = 5; \u5230\u5e95\u53d1\u751f\u4e86\u4ec0\u4e48？<\/h2>\n

    \u4f60\u73b0\u5728\u5df2\u7ecf\u77e5\u9053：<\/p>\n

    int x = 5;<\/p>\n

    \u53ef\u4ee5\u7c97\u7565\u7406\u89e3\u6210：<\/p>\n

    x
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 5 \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

    \u4f46\u8fd9\u4e2a\u201c\u76d2\u5b50\u201d\u5b9e\u9645\u4e0a\u4e0d\u662f\u51ed\u7a7a\u5b58\u5728\u7684\u3002<\/p>\n

    \u5b83\u8981\u653e\u5728\u7535\u8111\u7684：<\/p>\n

    \u5185\u5b58 RAM<\/p>\n

    \u91cc\u9762\u3002<\/p>\n

    \u4f60\u53ef\u4ee5\u628a\u5185\u5b58\u60f3\u8c61\u6210\u4e00\u6392\u975e\u5e38\u975e\u5e38\u591a\u7684\u5c0f\u623f\u95f4\u3002<\/p>\n

    \u5185\u5b58<\/p>\n

    \u5730\u57401000 \u5730\u57401004 \u5730\u57401008 \u5730\u57401012
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510 \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 \u2502 \u2502 \u2502 \u2502 \u2502 \u2502 \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518 \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

    \u6bcf\u4e00\u5757\u4f4d\u7f6e\u90fd\u6709\u81ea\u5df1\u7684：<\/p>\n

    \u5730\u5740<\/p>\n

    \u5c31\u50cf\u73b0\u5b9e\u4e2d\u7684\u623f\u5b50\u6709\u95e8\u724c\u53f7\u3002<\/p>\n

    \n

    2. \u53d8\u91cf\u540d\u548c\u5730\u5740\u4e0d\u662f\u4e00\u56de\u4e8b<\/h2>\n

    \u5047\u8bbe：<\/p>\n

    int x = 5;<\/p>\n

    \u7535\u8111\u53ef\u80fd\u628a x \u653e\u5728\u67d0\u4e2a\u5185\u5b58\u4f4d\u7f6e\u3002<\/p>\n

    \u6bd4\u5982\u4e3a\u4e86\u7406\u89e3，\u6211\u4eec\u5047\u8bbe：<\/p>\n

    \u53d8\u91cf\u540d：x<\/p>\n

    \u5185\u5b58\u5730\u5740：1000<\/p>\n

    \u5185\u5bb9：5<\/p>\n

    \u90a3\u4e48\u53ef\u4ee5\u753b：<\/p>\n

    x
    \n \u2193
    \n\u5730\u5740 1000
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 5 \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

    \u8fd9\u91cc：<\/p>\n

    x<\/p>\n

    \u662f\u4f60\u7ed9\u53d8\u91cf\u8d77\u7684\u540d\u5b57\u3002<\/p>\n

    \u800c：<\/p>\n

    1000<\/p>\n

    \u662f\u5b83\u771f\u6b63\u4f4d\u4e8e\u5185\u5b58\u4e2d\u7684\u5730\u5740\u3002<\/p>\n

    \u73b0\u5b9e\u7a0b\u5e8f\u91cc\u7684\u5730\u5740\u4e0d\u4f1a\u8fd9\u4e48\u7b80\u5355，\u53ef\u80fd\u957f\u5f97\u50cf：<\/p>\n

    0x7ffd1234abcd<\/p>\n

    \u73b0\u5728\u5148\u4e0d\u7528\u7ba1\u3002<\/p>\n

    \n

    3. \u5730\u5740\u5c31\u50cf\u95e8\u724c\u53f7<\/h2>\n

    \u8fd9\u662f\u7406\u89e3\u6307\u9488\u6700\u597d\u7684\u7c7b\u6bd4\u4e4b\u4e00\u3002<\/p>\n

    \u5047\u8bbe：<\/p>\n

    \u676d\u5dde\u67d0\u5c0f\u533a 3\u680b502\u5ba4<\/p>\n

    \u8fd9\u662f\u4e00\u4e2a\u5730\u5740\u3002<\/p>\n

    \u623f\u95f4\u91cc\u9762\u4f4f\u7740\u4e00\u4e2a\u4eba\u3002<\/p>\n

    \u5bf9\u5e94 C++：<\/p>\n

    \u5730\u5740
    \n\u2193
    \n\u5185\u5b58\u4e2d\u7684\u4f4d\u7f6e<\/p>\n

    \u503c
    \n\u2193
    \n\u8fd9\u4e2a\u4f4d\u7f6e\u91cc\u9762\u5b58\u653e\u7684\u6570\u636e<\/p>\n

    \u6240\u4ee5：<\/p>\n

    int x = 5;<\/p>\n

    \u53ef\u4ee5\u60f3\u6210：<\/p>\n

    \u95e8\u724c\u53f7：1000
    \n\u623f\u95f4\u5185\u5bb9：5<\/p>\n

    \n

    4. \u600e\u4e48\u77e5\u9053 x \u7684\u5730\u5740？<\/h2>\n

    C++ \u53ef\u4ee5\u5199：<\/p>\n

    &x<\/p>\n

    \u6ce8\u610f：<\/p>\n

    \u8fd9\u91cc\u7684：<\/p>\n

    &<\/p>\n

    \u548c\u4e0a\u4e00\u8bfe\u7684：<\/p>\n

    int& y = x;<\/p>\n

    \u867d\u7136\u7b26\u53f7\u4e00\u6837，\u4f46\u4f4d\u7f6e\u4e0d\u540c，\u610f\u4e49\u4e5f\u4e0d\u540c\u3002<\/p>\n

    \u8fd9\u91cc：<\/p>\n

    &x<\/p>\n

    \u8868\u793a：<\/p>\n

    \u53d6\u5f97\u53d8\u91cf x \u7684\u5730\u5740\u3002<\/p>\n

    \n

    5. \u770b\u4e00\u4e2a\u7a0b\u5e8f<\/h2>\n

    #include <iostream><\/p>\n

    int main()
    \n{
    \n int x = 5;<\/p>\n

    std::cout << x << std::endl;
    \n std::cout << &x << std::endl;<\/p>\n

    return 0;
    \n}<\/p>\n

    \u7b2c\u4e00\u53e5：<\/p>\n

    std::cout << x << std::endl;<\/p>\n

    \u8f93\u51fa\u7684\u662f：<\/p>\n

    5<\/p>\n

    \u7b2c\u4e8c\u53e5：<\/p>\n

    std::cout << &x << std::endl;<\/p>\n

    \u8f93\u51fa\u7684\u662f：<\/p>\n

    x \u5728\u5185\u5b58\u4e2d\u7684\u5730\u5740\u3002<\/p>\n

    \u4f60\u53ef\u80fd\u770b\u5230\u7c7b\u4f3c：<\/p>\n

    0x7ffdf2817a4c<\/p>\n

    \u6bcf\u6b21\u8fd0\u884c\u751a\u81f3\u53ef\u80fd\u4e0d\u4e00\u6837\u3002<\/p>\n

    \u73b0\u5728\u4e0d\u9700\u8981\u89e3\u91ca\u4e3a\u4ec0\u4e48\u3002<\/p>\n

    \n

    6. \u4e24\u79cd & \u5343\u4e07\u5148\u5206\u5f00<\/h2>\n

    \u76ee\u524d\u4f60\u9047\u5230\u4e24\u79cd：<\/p>\n

    \u7b2c\u4e00\u79cd<\/h4>\n

    int& y = x;<\/p>\n

    \u8fd9\u91cc：<\/p>\n

    &<\/p>\n

    \u8868\u793a：<\/p>\n

    y \u662f\u4e00\u4e2a\u5f15\u7528\u3002<\/p>\n

    \n

    \u7b2c\u4e8c\u79cd<\/h4>\n

    &x<\/p>\n

    \u8fd9\u91cc：<\/p>\n

    &<\/p>\n

    \u8868\u793a：<\/p>\n

    \u53d6\u5f97 x \u7684\u5730\u5740\u3002<\/p>\n

    \u4f60\u53ef\u4ee5\u5148\u6839\u636e\u4f4d\u7f6e\u533a\u5206：<\/p>\n

    int& y
    \n \u2191
    \n\u58f0\u660e\u5f15\u7528<\/p>\n

    &x
    \n\u2191
    \n\u83b7\u53d6\u5730\u5740<\/p>\n

    \u4ee5\u540e\u4f1a\u9010\u6e10\u4e60\u60ef\u3002<\/p>\n

    \n

    7. \u90a3\u201c\u6307\u9488\u201d\u662f\u4ec0\u4e48？<\/h2>\n

    \u7ec8\u4e8e\u5230\u4e86\u6838\u5fc3\u3002<\/p>\n

    \u5047\u8bbe：<\/p>\n

    int x = 5;<\/p>\n

    \u800c：<\/p>\n

    &x<\/p>\n

    \u80fd\u83b7\u5f97 x \u7684\u5730\u5740\u3002<\/p>\n

    \u90a3\u4e48\u6211\u4eec\u80fd\u4e0d\u80fd\u521b\u5efa\u4e00\u4e2a\u53d8\u91cf，\u4e13\u95e8\u4fdd\u5b58\u8fd9\u4e2a\u5730\u5740？<\/p>\n

    \u53ef\u4ee5\u3002<\/p>\n

    \u8fd9\u5c31\u662f：<\/p>\n

    \u6307\u9488 pointer<\/p>\n

    \u4f8b\u5982：<\/p>\n

    int* p = &x;<\/p>\n

    \u7b2c\u4e00\u6b21\u770b\u5230\u5f88\u602a\u3002<\/p>\n

    \u6211\u4eec\u4e00\u70b9\u70b9\u62c6\u3002<\/p>\n

    \n

    8. int* p = &x;<\/h2>\n

    \u5148\u770b\u53f3\u8fb9：<\/p>\n

    &x<\/p>\n

    \u610f\u601d：<\/p>\n

    x \u7684\u5730\u5740\u3002<\/p>\n

    \u5047\u8bbe：<\/p>\n

    &x = 1000<\/p>\n

    \u7136\u540e：<\/p>\n

    int* p<\/p>\n

    \u8868\u793a：<\/p>\n

    \u521b\u5efa\u4e00\u4e2a\u6307\u9488\u53d8\u91cf，\u540d\u5b57\u53eb p\u3002<\/p>\n

    \u5b83\u7528\u6765\u4fdd\u5b58：<\/p>\n

    \u4e00\u4e2a int \u7c7b\u578b\u53d8\u91cf\u7684\u5730\u5740\u3002<\/p>\n

    \u6240\u4ee5：<\/p>\n

    int* p = &x;<\/p>\n

    \u53ef\u4ee5\u7ffb\u8bd1\u6210：<\/p>\n

    \u521b\u5efa\u4e00\u4e2a\u6307\u5411 int \u7684\u6307\u9488 p，\u8ba9\u5b83\u4fdd\u5b58 x \u7684\u5730\u5740\u3002<\/p>\n

    \n

    9. \u753b\u51fa\u6765\u5c31\u975e\u5e38\u76f4\u89c2\u4e86<\/h2>\n

    int x = 5;
    \nint* p = &x;<\/p>\n

    \u53ef\u4ee5\u60f3\u6210：<\/p>\n

    x
    \n\u5730\u57401000
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 5 \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2518
    \n \u25b2
    \n \u2502
    \n \u2502 p\u91cc\u9762\u5b58\u77401000
    \n \u2502
    \np
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 1000 \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

    \u4e5f\u5c31\u662f\u8bf4：<\/p>\n

    p<\/p>\n

    \u4e0d\u662f\u5b58 5\u3002<\/p>\n

    \u800c\u662f\u5b58：<\/p>\n

    x \u5728\u54ea\u91cc\u3002<\/p>\n

    \u8fd9\u5c31\u662f\u6307\u9488\u3002<\/p>\n

    \n

    10. \u4e00\u53e5\u8bdd\u7406\u89e3\u6307\u9488<\/h2>\n

    \u6307\u9488\u5c31\u662f\u4e00\u4e2a\u4e13\u95e8\u4fdd\u5b58\u5185\u5b58\u5730\u5740\u7684\u53d8\u91cf\u3002<\/p>\n

    \u666e\u901a\u53d8\u91cf：<\/p>\n

    int x = 5;<\/p>\n

    \u91cc\u9762\u653e：<\/p>\n

    5<\/p>\n

    \u6307\u9488\u53d8\u91cf：<\/p>\n

    int* p = &x;<\/p>\n

    \u91cc\u9762\u653e：<\/p>\n

    x \u7684\u5730\u5740<\/p>\n

    \n

    11. * \u53c8\u662f\u4ec0\u4e48？<\/h2>\n

    \u73b0\u5728\u51fa\u73b0\u7b2c\u4e8c\u4e2a\u6838\u5fc3\u7b26\u53f7：<\/p>\n

    *p<\/p>\n

    \u5982\u679c：<\/p>\n

    p<\/p>\n

    \u91cc\u9762\u5b58\u7684\u662f x \u7684\u5730\u5740，\u90a3\u4e48：<\/p>\n

    *p<\/p>\n

    \u610f\u601d\u5c31\u662f：<\/p>\n

    \u6839\u636e p \u4fdd\u5b58\u7684\u5730\u5740，\u627e\u5230\u90a3\u4e2a\u4f4d\u7f6e\u91cc\u9762\u7684\u6570\u636e\u3002<\/p>\n

    \u8fd9\u4e2a\u64cd\u4f5c\u53eb：<\/p>\n

    \u89e3\u5f15\u7528 dereference<\/p>\n

    \u6682\u65f6\u4e0d\u7528\u80cc\u82f1\u6587\u3002<\/p>\n

    \u4f60\u53ef\u4ee5\u628a：<\/p>\n

    *p<\/p>\n

    \u7406\u89e3\u6210：<\/p>\n

    \u201c\u987a\u7740 p \u627e\u8fc7\u53bb，\u770b\u770b\u91cc\u9762\u662f\u4ec0\u4e48\u3002\u201d<\/p>\n

    \n

    12. \u4e3e\u4f8b<\/h2>\n

    int x = 5;<\/p>\n

    int* p = &x;<\/p>\n

    \u73b0\u5728：<\/p>\n

    p \u5b58\u7740 x \u7684\u5730\u5740<\/p>\n

    \u6240\u4ee5：<\/p>\n

    *p<\/p>\n

    \u5c31\u662f：<\/p>\n

    5<\/p>\n

    \u4f8b\u5982：<\/p>\n

    std::cout << *p << std::endl;<\/p>\n

    \u8f93\u51fa：<\/p>\n

    5<\/p>\n

    \n

    13. \u73b0\u5728\u6211\u4eec\u6709\u4e09\u4e2a\u4e0d\u540c\u7684\u4e1c\u897f<\/h2>\n

    \u5047\u8bbe：<\/p>\n

    int x = 5;
    \nint* p = &x;<\/p>\n

    \u90a3\u4e48：<\/p>\n

    x<\/p>\n

    \u8868\u793a：<\/p>\n

    x \u91cc\u9762\u7684\u503c<\/p>\n

    \u4e5f\u5c31\u662f：<\/p>\n

    5<\/p>\n

    \n

    &x<\/p>\n

    \u8868\u793a：<\/p>\n

    x \u7684\u5730\u5740<\/p>\n

    \u4f8b\u5982\u5047\u8bbe：<\/p>\n

    1000<\/p>\n

    \n

    p<\/p>\n

    \u8868\u793a：<\/p>\n

    p \u91cc\u9762\u4fdd\u5b58\u7684\u5185\u5bb9<\/p>\n

    \u800c p \u4fdd\u5b58\u7684\u5c31\u662f：<\/p>\n

    1000<\/p>\n

    \n

    *p<\/p>\n

    \u8868\u793a：<\/p>\n

    \u53bb p \u6307\u5411\u7684\u4f4d\u7f6e\u53d6\u503c<\/p>\n

    \u4e8e\u662f\u5f97\u5230：<\/p>\n

    5<\/p>\n

    \u6240\u4ee5：<\/p>\n

    x \u2192 5<\/p>\n

    &x \u2192 1000<\/p>\n

    p \u2192 1000<\/p>\n

    *p \u2192 5<\/p>\n

    \u8fd9\u662f\u672c\u8bfe\u6700\u6838\u5fc3\u7684\u5173\u7cfb\u3002<\/p>\n

    \n

    14. \u4e3a\u4ec0\u4e48 *p \u80fd\u4fee\u6539 x？<\/h2>\n

    \u770b：<\/p>\n

    int x = 5;
    \nint* p = &x;<\/p>\n

    *p = 100;<\/p>\n

    \u8fd9\u91cc：<\/p>\n

    *p<\/p>\n

    \u6307\u7684\u662f：<\/p>\n

    p \u6307\u5411\u7684\u90a3\u4e2a\u53d8\u91cf\u3002<\/p>\n

    \u800c p \u6307\u5411：<\/p>\n

    x<\/p>\n

    \u6240\u4ee5：<\/p>\n

    *p = 100;<\/p>\n

    \u5b9e\u9645\u4e0a\u5c31\u662f：<\/p>\n

    x = 100;<\/p>\n

    \u6700\u7ec8：<\/p>\n

    x = 100<\/p>\n

    \n

    15. \u56fe\u793a\u7406\u89e3<\/h2>\n

    \u5f00\u59cb：<\/p>\n

    p
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 1000 \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518
    \n \u2502
    \n \u25bc<\/p>\n

    \u5730\u57401000
    \nx
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 5 \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

    \u6267\u884c：<\/p>\n

    *p = 100;<\/p>\n

    \u610f\u601d：<\/p>\n

    \u987a\u7740 p \u627e\u5230\u5730\u5740 1000，\u628a\u90a3\u4e2a\u4f4d\u7f6e\u7684\u5185\u5bb9\u6539\u6210 100\u3002<\/p>\n

    \u4e8e\u662f：<\/p>\n

    p
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 1000 \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518
    \n \u2502
    \n \u25bc<\/p>\n

    x
    \n\u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n\u2502 100 \u2502
    \n\u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

    \n

    16. \u5b8c\u6574\u7a0b\u5e8f<\/h2>\n

    #include <iostream><\/p>\n

    int main()
    \n{
    \n int x = 5;<\/p>\n

    int* p = &x;<\/p>\n

    std::cout << x << std::endl;
    \n std::cout << *p << std::endl;<\/p>\n

    *p = 100;<\/p>\n

    std::cout << x << std::endl;<\/p>\n

    return 0;
    \n}<\/p>\n

    \u8f93\u51fa：<\/p>\n

    5
    \n5
    \n100<\/p>\n

    \u4e3a\u4ec0\u4e48？<\/p>\n

    \u7b2c\u4e00\u6b21：<\/p>\n

    std::cout << x;<\/p>\n

    \u8f93\u51fa：<\/p>\n

    5<\/p>\n

    \u7b2c\u4e8c\u6b21：<\/p>\n

    std::cout << *p;<\/p>\n

    \u56e0\u4e3a p \u6307\u5411 x，\u6240\u4ee5\u4e5f\u662f：<\/p>\n

    5<\/p>\n

    \u7136\u540e：<\/p>\n

    *p = 100;<\/p>\n

    \u76f4\u63a5\u4fee\u6539 x\u3002<\/p>\n

    \u6700\u540e\u8f93\u51fa：<\/p>\n

    100<\/p>\n

    \n

    17. \u6307\u9488\u548c\u5f15\u7528\u662f\u4e0d\u662f\u5f88\u50cf？<\/h2>\n

    \u975e\u5e38\u50cf\u3002<\/p>\n

    \u5f15\u7528：<\/p>\n

    int x = 5;<\/p>\n

    int& ref = x;<\/p>\n

    ref = 100;<\/p>\n

    \u7ed3\u679c：<\/p>\n

    x = 100<\/p>\n

    \u6307\u9488：<\/p>\n

    int x = 5;<\/p>\n

    int* p = &x;<\/p>\n

    *p = 100;<\/p>\n

    \u7ed3\u679c\u540c\u6837：<\/p>\n

    x = 100<\/p>\n

    \u6240\u4ee5\u4f60\u53ef\u80fd\u95ee：<\/p>\n

    \u90a3\u4e3a\u4ec0\u4e48\u8fd8\u8981\u4e24\u79cd？<\/p>\n

    \u975e\u5e38\u597d\u7684\u95ee\u9898\u3002<\/p>\n

    \u73b0\u5728\u5148\u4e0d\u6df1\u5165，\u5148\u5efa\u7acb\u6700\u7b80\u5355\u533a\u522b\u3002<\/p>\n

    \n

    18. \u5f15\u7528\u66f4\u50cf\u201c\u522b\u540d\u201d<\/h2>\n

    int& ref = x;<\/p>\n

    \u53ef\u4ee5\u7406\u89e3\u6210：<\/p>\n

    x \u548c ref \u662f\u540c\u4e00\u4e2a\u4e1c\u897f\u7684\u4e24\u4e2a\u540d\u5b57<\/p>\n

    \u4ee5\u540e\u6b63\u5e38\u4f7f\u7528：<\/p>\n

    ref = 10;<\/p>\n

    \u4e0d\u9700\u8981\u7279\u6b8a\u7b26\u53f7\u3002<\/p>\n

    \n

    19. \u6307\u9488\u66f4\u50cf\u201c\u5730\u5740\u7eb8\u6761\u201d<\/h2>\n

    int* p = &x;<\/p>\n

    p \u81ea\u5df1\u662f\u4e00\u4e2a\u53d8\u91cf\u3002<\/p>\n

    \u91cc\u9762\u4fdd\u5b58：<\/p>\n

    x \u7684\u5730\u5740\u3002<\/p>\n

    \u5982\u679c\u60f3\u64cd\u4f5c x：<\/p>\n

    *p<\/p>\n

    \u9700\u8981\u5148\u201c\u987a\u7740\u5730\u5740\u627e\u8fc7\u53bb\u201d\u3002<\/p>\n

    \u6240\u4ee5：<\/p>\n

    \u5f15\u7528
    \n\u2248 \u522b\u540d<\/p>\n

    \u6307\u9488
    \n\u2248 \u4fdd\u5b58\u5730\u5740\u7684\u53d8\u91cf<\/p>\n

    \n

    20. \u7528\u73b0\u5b9e\u5730\u5740\u7c7b\u6bd4<\/h2>\n

    \u5047\u8bbe：<\/p>\n

    x = \u4e00\u53f0\u673a\u68b0\u81c2<\/p>\n

    \u5f15\u7528：<\/p>\n

    ref<\/p>\n

    \u76f8\u5f53\u4e8e：<\/p>\n

    \u7ed9\u8fd9\u53f0\u673a\u68b0\u81c2\u8d77\u4e86\u53e6\u4e00\u4e2a\u540d\u5b57\u3002<\/p>\n

    \n

    \u6307\u9488：<\/p>\n

    p<\/p>\n

    \u76f8\u5f53\u4e8e\u4f60\u624b\u91cc\u6709\u4e00\u5f20\u7eb8：<\/p>\n

    \u201c\u673a\u68b0\u81c2\u5728 3\u53f7\u5b9e\u9a8c\u5ba4\u201d<\/p>\n

    \u8fd9\u4e2a\u7eb8\u6761\u4e0d\u662f\u673a\u68b0\u81c2\u672c\u8eab\u3002<\/p>\n

    \u5b83\u53ea\u662f\u544a\u8bc9\u4f60：<\/p>\n

    \u53bb\u54ea\u91cc\u627e\u5230\u673a\u68b0\u81c2\u3002<\/p>\n

    \u7136\u540e：<\/p>\n

    *p<\/p>\n

    \u5c31\u76f8\u5f53\u4e8e：<\/p>\n

    \u6309\u7eb8\u6761\u4e0a\u7684\u5730\u5740\u627e\u5230\u673a\u68b0\u81c2\u672c\u4f53\u3002<\/p>\n

    \n

    21. int* p \u91cc\u7684 * \u548c *p \u53c8\u6709\u533a\u522b<\/h2>\n

    \u8fd9\u4e5f\u662f\u521d\u5b66\u8005\u5bb9\u6613\u6df7\u7684\u5730\u65b9\u3002<\/p>\n

    \u58f0\u660e\u65f6：<\/h4>\n

    int* p;<\/p>\n

    \u8fd9\u91cc\u7684：<\/p>\n

    *<\/p>\n

    \u8868\u793a：<\/p>\n

    p \u662f\u4e00\u4e2a\u6307\u9488\u53d8\u91cf\u3002<\/p>\n

    \n

    \u4f7f\u7528\u65f6：<\/h4>\n

    *p<\/p>\n

    \u8fd9\u91cc\u7684：<\/p>\n

    *<\/p>\n

    \u8868\u793a：<\/p>\n

    \u8bbf\u95ee p \u6307\u5411\u7684\u90a3\u4e2a\u53d8\u91cf\u3002<\/p>\n

    \u867d\u7136\u90fd\u662f *，\u4f46\u662f\u6240\u5728\u4f4d\u7f6e\u4e0d\u540c\u3002<\/p>\n

    \u5148\u6839\u636e\u4e0a\u4e0b\u6587\u533a\u5206\u3002<\/p>\n

    \n

    22. \u73b0\u5728\u628a\u56db\u4e2a\u4e1c\u897f\u653e\u5728\u4e00\u8d77<\/h2>\n

    int x = 5;
    \nint* p = &x;<\/p>\n

    \u7262\u8bb0：<\/p>\n

    x
    \n\u2193
    \n\u53d8\u91cf\u7684\u503c
    \n5<\/p>\n

    &x
    \n\u2193
    \n\u53d8\u91cf\u7684\u5730\u5740<\/p>\n

    p
    \n\u2193
    \np \u4fdd\u5b58\u7684\u5730\u5740
    \n\u4e5f\u5c31\u662f &x<\/p>\n

    *p
    \n\u2193
    \np \u6307\u5411\u5730\u5740\u91cc\u7684\u503c
    \n\u4e5f\u5c31\u662f x
    \n\u4e5f\u5c31\u662f 5<\/p>\n

    \u6240\u4ee5\u53ef\u4ee5\u8bb0\u6210：<\/p>\n

    p = &x<\/p>\n

    *p = x<\/p>\n

    \u8fd9\u662f\u975e\u5e38\u91cd\u8981\u7684\u4e00\u7ec4\u5173\u7cfb\u3002<\/p>\n

    \n

    23. \u6307\u9488\u600e\u4e48\u7528\u4e8e\u51fd\u6570？<\/h2>\n

    \u4e0a\u4e00\u8bfe\u6211\u4eec\u7528\u5f15\u7528：<\/p>\n

    void change(int& a)
    \n{
    \n a = 100;
    \n}<\/p>\n

    \u6307\u9488\u4e5f\u80fd\u505a\u5230\u3002<\/p>\n

    \u4f8b\u5982：<\/p>\n

    void change(int* p)
    \n{
    \n *p = 100;
    \n}<\/p>\n

    \u8c03\u7528\u65f6：<\/p>\n

    int x = 5;<\/p>\n

    change(&x);<\/p>\n

    \u6ce8\u610f\u8fd9\u91cc\u4e0d\u518d\u4f20：<\/p>\n

    x<\/p>\n

    \u800c\u662f\u4f20：<\/p>\n

    &x<\/p>\n

    \u4e5f\u5c31\u662f：<\/p>\n

    x \u7684\u5730\u5740\u3002<\/p>\n

    \n

    24. \u4e00\u6b65\u4e00\u6b65\u770b<\/h2>\n

    \u51fd\u6570：<\/p>\n

    void change(int* p)<\/p>\n

    \u8868\u793a：<\/p>\n

    change \u9700\u8981\u63a5\u6536\u4e00\u4e2a int \u7684\u5730\u5740\u3002<\/p>\n

    \u5916\u9762：<\/p>\n

    int x = 5;<\/p>\n

    \u7136\u540e：<\/p>\n

    change(&x);<\/p>\n

    \u628a：<\/p>\n

    x \u7684\u5730\u5740<\/p>\n

    \u4f20\u8fdb\u53bb\u3002<\/p>\n

    \u4e8e\u662f\u51fd\u6570\u91cc\u7684：<\/p>\n

    p<\/p>\n

    \u4fdd\u5b58：<\/p>\n

    x \u7684\u5730\u5740<\/p>\n

    \u518d\u6267\u884c：<\/p>\n

    *p = 100;<\/p>\n

    \u5c31\u662f：<\/p>\n

    \u6839\u636e\u5730\u5740\u627e\u5230 x，\u628a\u5b83\u6539\u6210 100\u3002<\/p>\n

    \u6240\u4ee5\u6700\u7ec8：<\/p>\n

    x = 100<\/p>\n

    \n

    25. \u5f15\u7528\u53c2\u6570\u548c\u6307\u9488\u53c2\u6570\u5bf9\u6bd4<\/h2>\n

    \u5f15\u7528<\/h4>\n

    void change(int& a)
    \n{
    \n a = 100;
    \n}<\/p>\n

    change(x);<\/p>\n

    \n

    \u6307\u9488<\/h4>\n

    void change(int* p)
    \n{
    \n *p = 100;
    \n}<\/p>\n

    change(&x);<\/p>\n

    \u4e24\u8005\u90fd\u80fd\u4fee\u6539\u5916\u90e8\u7684 x\u3002<\/p>\n

    \u4f46\u662f\u5199\u6cd5\u660e\u663e\u4e0d\u540c\u3002<\/p>\n

    \u73b0\u5728\u5148\u8bb0\u4f4f\u7ed3\u6784，\u4e0d\u9700\u8981\u5224\u65ad\u201c\u54ea\u4e2a\u66f4\u597d\u201d\u3002<\/p>\n

    \u540e\u9762\u968f\u7740\u5de5\u7a0b\u4ee3\u7801\u5b66\u4e60，\u6211\u4eec\u4f1a\u8bb2\u4f7f\u7528\u573a\u666f\u3002<\/p>\n

    \n

    26. \u673a\u5668\u4eba\u91cc\u4e3a\u4ec0\u4e48\u4f1a\u9047\u5230\u6307\u9488？<\/h2>\n

    \u975e\u5e38\u591a\u3002<\/p>\n

    \u6bd4\u5982\u4ee5\u540e\u4f60\u5904\u7406：<\/p>\n

    \u4f20\u611f\u5668\u6570\u636e
    \n\u56fe\u50cf
    \n\u6570\u7ec4
    \n\u52a8\u6001\u5185\u5b58
    \nROS2\u6d88\u606f
    \n\u8bbe\u5907\u9a71\u52a8
    \n\u4e32\u53e3\u7f13\u5b58\u533a
    \nCAN\u6570\u636e<\/p>\n

    \u7ecf\u5e38\u4f1a\u51fa\u73b0\u5730\u5740\u3002<\/p>\n

    \u4f8b\u5982\u4f60\u4ee5\u540e\u53ef\u80fd\u89c1：<\/p>\n

    uint8_t* data;<\/p>\n

    \u5b83\u5927\u6982\u610f\u601d\u5c31\u662f：<\/p>\n

    data \u662f\u4e00\u4e2a\u6307\u9488，\u6307\u5411\u4e00\u5757 uint8_t \u6570\u636e\u3002<\/p>\n

    \u6216\u8005 OpenCV\u3001\u5e95\u5c42\u9a71\u52a8\u7a0b\u5e8f\u91cc\u7ecf\u5e38\u4f1a\u6d89\u53ca：<\/p>\n

    \u4e00\u5757\u8fde\u7eed\u5185\u5b58\u5230\u5e95\u5728\u54ea\u91cc\u3002<\/p>\n

    \u6240\u4ee5\u6307\u9488\u662f C\/C++ \u5e95\u5c42\u7f16\u7a0b\u80fd\u529b\u7684\u6838\u5fc3\u3002<\/p>\n

    \n

    27. \u4f46\u4e3a\u4ec0\u4e48\u6307\u9488\u5bb9\u6613\u51fa\u95ee\u9898？<\/h2>\n

    \u56e0\u4e3a\u6307\u9488\u4fdd\u5b58\u7684\u662f\u5730\u5740\u3002<\/p>\n

    \u5982\u679c\u5730\u5740\u9519\u8bef：<\/p>\n

    \u627e\u9519\u623f\u95f4<\/p>\n

    \u4f60\u5c31\u53ef\u80fd\u8bbf\u95ee\u4e0d\u5c5e\u4e8e\u81ea\u5df1\u7684\u5185\u5b58\u3002<\/p>\n

    \u8fd9\u4f1a\u5bfc\u81f4：<\/p>\n

    \u7a0b\u5e8f\u5d29\u6e83
    \n\u6570\u636e\u88ab\u7834\u574f
    \nSegmentation fault<\/p>\n

    \u6240\u4ee5\u4ee5\u540e\u6211\u4eec\u4f1a\u4e13\u95e8\u8bb2：<\/p>\n

    nullptr<\/p>\n

    \u4ee5\u53ca：<\/p>\n

    \u7a7a\u6307\u9488\u3001\u91ce\u6307\u9488\u3001\u60ac\u7a7a\u6307\u9488<\/p>\n

    \u4f46\u4eca\u5929\u4e0d\u8981\u4e00\u4e0b\u585e\u592a\u591a\u3002<\/p>\n

    \n

    28. \u4eca\u5929\u53ea\u638c\u63e1\u8fd9\u4e00\u5f20\u56fe<\/h2>\n

    int x = 5;
    \nint* p = &x;<\/p>\n

    \u5bf9\u5e94：<\/p>\n

    p
    \n \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n \u2502 \u5730\u5740 \u2502
    \n \u2514\u2500\u2500\u2500\u252c\u2500\u2500\u2500\u2500\u2518
    \n \u2502
    \n \u25bc
    \n x
    \n \u250c\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2510
    \n \u2502 5 \u2502
    \n \u2514\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2500\u2518<\/p>\n

    \u5e76\u4e14：<\/p>\n

    x \u2192 5<\/p>\n

    &x \u2192 x\u7684\u5730\u5740<\/p>\n

    p \u2192 x\u7684\u5730\u5740<\/p>\n

    *p \u2192 5<\/p>\n

    \u5982\u679c\u628a\u8fd9\u4e2a\u771f\u6b63\u7406\u89e3，\u6307\u9488\u5c31\u8fc8\u8fc7\u7b2c\u4e00\u9053\u574e\u4e86\u3002<\/p>\n

    \n

    \u672c\u8bfe\u5c0f\u7ec3\u4e60<\/h2>\n

    \u7b2c 1 \u9898<\/h4>\n

    int x = 10;<\/p>\n

    int* p = &x;<\/p>\n

    \u90a3\u4e48：<\/p>\n

    *p = ?<\/p>\n

    \n

    \u7b2c 2 \u9898<\/h4>\n

    int x = 5;
    \nint* p = &x;<\/p>\n

    *p = 20;<\/p>\n

    \u6700\u540e：<\/p>\n

    x = ?<\/p>\n

    \n

    \u7b2c 3 \u9898<\/h4>\n

    \u7528\u81ea\u5df1\u7684\u8bdd\u5206\u522b\u89e3\u91ca：<\/p>\n

    &x<\/p>\n

    \u548c：<\/p>\n

    *p<\/p>\n

    \n

    \u7b2c 4 \u9898<\/h4>\n

    \u4e0b\u9762\u4ee3\u7801：<\/p>\n

    void change(int* p)
    \n{
    \n *p = 50;
    \n}<\/p>\n

    int main()
    \n{
    \n int x = 3;<\/p>\n

    change(&x);
    \n}<\/p>\n

    \u6700\u540e：<\/p>\n

    x = ?<\/p>\n","protected":false},"excerpt":{"rendered":"

    \u4e0a\u4e00\u8bfe\u6807\u51c6\u7b54\u6848：\u6700\u7ec8\u8f93\u51fa：20\u56e0\u4e3a：void change(int& a)\u4e2d\u7684 a \u662f x \u7684\u5f15\u7528，\u4fee\u6539 a \u5c31\u662f\u5728\u4fee\u6539\u539f\u6765\u7684 x\u3002x 30
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