malloc\/free\u662f C \u8bed\u8a00<stdlib.h>\u5e93\u63d0\u4f9b\u7684\u57fa\u7840\u51fd\u6570<\/span>，\u5b8c\u5168\u670d\u52a1\u4e8e C \u8bed\u8a00 \u201c\u9762\u5411\u8fc7\u7a0b\u3001\u8f7b\u91cf\u9ad8\u6548\u201d \u7684\u8bbe\u8ba1\u7406\u5ff5\u3002<\/p>\n \u5176\u6838\u5fc3\u7279\u5f81\u662f\u65e0\u7c7b\u578b\u611f\u77e5：malloc\u4ec5\u6839\u636e\u4f20\u5165\u7684\u5b57\u8282\u6570\u5206\u914d\u5185\u5b58\u5757，\u8fd4\u56de\u503c\u4e3avoid*（\u65e0\u7c7b\u578b\u6307\u9488），\u8fd9\u610f\u5473\u7740\u5b83\u65e0\u6cd5\u8bc6\u522b\u5185\u5b58\u7684\u5b9e\u9645\u7528\u9014，\u4f7f\u7528\u65f6\u5fc5\u987b\u901a\u8fc7\u5f3a\u5236\u7c7b\u578b\u8f6c\u6362（\u5982(int*)malloc(10 * sizeof(int))）\u5c06void*\u8f6c\u4e3a\u76ee\u6807\u7c7b\u578b\u6307\u9488\u3002<\/p>\n \u8fd9\u79cd\u624b\u52a8\u8f6c\u6362\u4e0d\u4ec5\u589e\u52a0\u4ee3\u7801\u5197\u4f59，\u8fd8\u5b58\u5728\u7c7b\u578b\u4e0d\u5339\u914d\u7684\u98ce\u9669：<\/p>\n #include <stdlib.h> \/\/ \u5371\u9669\u64cd\u4f5c：\u9519\u8bef\u8f6c\u6362\u4e3adouble\u6307\u9488 new\/delete\u662f C++ \u8bed\u8a00\u539f\u751f\u8fd0\u7b97\u7b26，\u4e3a\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\u91cf\u8eab\u8bbe\u8ba1，\u5929\u7136\u5177\u5907\u7c7b\u578b\u5b89\u5168\u6027<\/span>\u3002new\u4f1a\u6839\u636e\u540e\u7eed\u6307\u5b9a\u7684\u7c7b\u578b（\u5982new int\u3001new MyClass）\u81ea\u52a8\u63a8\u5bfc\u5185\u5b58\u5757\u7684\u7c7b\u578b，\u76f4\u63a5\u8fd4\u56de\u5bf9\u5e94\u7c7b\u578b\u7684\u6307\u9488，\u65e0\u9700\u624b\u52a8\u5f3a\u5236\u8f6c\u6362\u3002\u4f8b\u5982int* arr = new int[10]，new\u76f4\u63a5\u8fd4\u56deint*\u7c7b\u578b，\u7f16\u8bd1\u5668\u4f1a\u4e25\u683c\u6821\u9a8c\u6307\u9488\u7c7b\u578b\u4e0e\u63a5\u6536\u53d8\u91cf\u7684\u5339\u914d\u6027，\u4ece\u8bed\u6cd5\u5c42\u9762\u675c\u7edd\u7c7b\u578b\u8f6c\u6362\u9519\u8bef，\u5927\u5e45\u63d0\u5347\u4ee3\u7801\u53ef\u9760\u6027\u3002<\/p>\n new\/delete\u662fC++\u8fd0\u7b97\u7b26，\u81ea\u52a8\u8fd4\u56de\u8be5\u7c7b\u578b\u7684\u6307\u9488\u3002<\/p>\n class MyClass { int data; }; \/\/ \u7c7b\u578b\u68c0\u67e5：\u4ee5\u4e0b\u4ee3\u7801\u4f1a\u76f4\u63a5\u7f16\u8bd1\u5931\u8d25 delete[] arr; \nmalloc\u4ec5\u5206\u914d\u5185\u5b58，\u4e0d\u521d\u59cb\u5316；free\u4e0d\u8c03\u7528\u6790\u6784\u51fd\u6570\u3002<\/span><\/p>\n new\u4f1a\u8c03\u7528\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316，delete\u5148\u8c03\u7528\u6790\u6784\u51fd\u6570\u518d\u91ca\u653e\u5185\u5b58\u3002<\/span><\/p>\n ————-\u8fd9\u662f\u4e8c\u8005\u6700\u6838\u5fc3\u7684\u5dee\u5f02，\u76f4\u63a5\u51b3\u5b9a\u4e86\u5bf9 \u201c\u5bf9\u8c61\u201d \u7684\u7ba1\u7406\u80fd\u529b\u3002<\/span><\/p>\n malloc\u7684\u529f\u80fd\u4ec5\u5c40\u9650\u4e8e \u201c\u5206\u914d\u6307\u5b9a\u5b57\u8282\u6570\u7684\u539f\u59cb\u5185\u5b58\u201d，\u4e0d\u4f1a\u5bf9\u5185\u5b58\u5185\u5bb9\u505a\u4efb\u4f55\u521d\u59cb\u5316，\u5206\u914d\u540e\u7684\u5185\u5b58\u4e2d\u662f\u968f\u673a\u7684\u5783\u573e\u503c，\u9700\u5f00\u53d1\u8005\u624b\u52a8\u8d4b\u503c，free\u540c\u6837\u5982\u6b64;<\/p>\n new\/delete\u5219\u6df1\u5ea6\u7ed1\u5b9a\u5bf9\u8c61\u7684\u751f\u547d\u5468\u671f：new\u5728\u5206\u914d\u5185\u5b58\u540e，\u4f1a\u81ea\u52a8\u8c03\u7528\u5bf9\u8c61\u7684\u6784\u9020\u51fd\u6570（\u9ed8\u8ba4\u6784\u9020\u3001\u6709\u53c2\u6784\u9020\u5747\u53ef），\u5b8c\u6210\u6210\u5458\u53d8\u91cf\u521d\u59cb\u5316\u3001\u52a8\u6001\u8d44\u6e90\u7533\u8bf7\u7b49\u6838\u5fc3\u64cd\u4f5c<\/p>\n \nmalloc\u9700\u624b\u52a8\u8ba1\u7b97\u5b57\u8282\u6570（\u5982malloc(10*sizeof(int))）；<\/span><\/p>\n new\u81ea\u52a8\u63a8\u5bfc\u5927\u5c0f（\u5982new int[10]）\u3002<\/span><\/p>\n<\/p>\n \nmalloc\u5931\u8d25\u8fd4\u56deNULL；<\/span><\/p>\n new\u5931\u8d25\u629b\u51fastd::bad_alloc\u5f02\u5e38\u3002<\/span><\/p>\n \u4ee3\u7801\u9644\u4e0a：<\/p>\n #include <iostream> class Test { int main() { \/\/ C++\u65b9\u5f0f：\u81ea\u52a8\u7c7b\u578b+\u5f02\u5e38\u5904\u7406 malloc\/free\u662f C \u8bed\u8a00\u7684 \u201c\u57fa\u7840\u5185\u5b58\u5de5\u5177\u201d，\u4ec5\u5173\u6ce8\u5185\u5b58\u5757\u7684\u5206\u914d\u4e0e\u91ca\u653e，\u9002\u914d\u7b80\u5355\u573a\u666f\u548c\u8de8\u8bed\u8a00\u4ea4\u4e92，\u4f46\u9700\u624b\u52a8\u5904\u7406\u7c7b\u578b\u3001\u521d\u59cb\u5316\u3001\u9519\u8bef\u68c0\u67e5\u7b49\u95ee\u9898；new\/delete\u662f C++ \u7684 \u201c\u667a\u80fd\u5bf9\u8c61\u7ba1\u5bb6\u201d，\u6574\u5408\u4e86\u5185\u5b58\u7ba1\u7406\u4e0e\u5bf9\u8c61\u751f\u547d\u5468\u671f\u7ba1\u7406，\u5177\u5907\u7c7b\u578b\u5b89\u5168\u3001\u81ea\u52a8\u5316\u3001\u5f02\u5e38\u53cb\u597d\u7b49\u4f18\u52bf，\u662f C++ \u9879\u76ee\u7ba1\u7406\u52a8\u6001\u5bf9\u8c61\u7684\u9996\u9009\u3002\u5b9e\u9645\u5f00\u53d1\u4e2d\u9700\u6839\u636e\u8bed\u8a00\u73af\u5883\u9009\u578b，\u907f\u514d\u6df7\u7528\u4e8c\u8005\u5bfc\u81f4\u5185\u5b58\u9519\u8bef\u3002<\/p>\n \u6838\u5fc3\u533a\u522b（\u56db\u4e2a\u70b9） \u65e0\u8111\u8bb0\u4f4f！！！\u4e00：\u8bed\u8a00\u5f52\u5c5e\u4e0e\u7c7b\u578b\u652f\u6301malloc\/free\u662f C \u8bed\u8a00\u5e93\u63d0\u4f9b\u7684\u57fa\u7840\u51fd\u6570，\u5b8c\u5168\u670d\u52a1\u4e8e C \u8bed\u8a00 \u201c\u9762\u5411\u8fc7\u7a0b\u3001\u8f7b\u91cf\u9ad8\u6548\u201d \u7684\u8bbe\u8ba1\u7406\u5ff5\u3002\u5176\u6838\u5fc3\u7279\u5f81\u662f\u65e0\u7c7b\u578b\u611f\u77e5：malloc\u4ec5\u6839\u636e\u4f20\u5165\u7684\u5b57\u8282\u6570\u5206\u914d\u5185\u5b58\u5757，\u8fd4\u56de\u503c\u4e3avoid*（\u65e0\u7c7b\u578b\u6307\u9488），\u8fd9\u610f\u5473\u7740\u5b83\u65e0\u6cd5\u8bc6\u522b\u5185\u5b58\u7684\u5b9e<\/p>\n","protected":false},"author":2,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[1],"tags":[55,174,190,925,176],"topic":[],"class_list":{"0":"post-62385","1":"post","2":"type-post","3":"status-publish","4":"format-standard","5":"hentry","6":"category-server","7":"tag-c","9":"tag-190","10":"tag-925","11":"tag-176"},"yoast_head":"\n
\nint main() {
\n \/\/ \u6b63\u786e\u7528\u6cd5：\u5206\u914d10\u4e2aint\u7a7a\u95f4\u5e76\u5f3a\u5236\u8f6c\u6362
\n int* int_arr = (int*)malloc(10 * sizeof(int));<\/p>\n
\n double* wrong_ptr = (double*)malloc(10 * sizeof(int));
\n wrong_ptr[0] = 3.14; \/\/ \u53ef\u80fd\u7834\u574f\u5185\u5b58\u5e03\u5c40
\n free(int_arr);
\n free(wrong_ptr);
\n}<\/p>\n
\nint main() {
\n \/\/ \u81ea\u52a8\u7c7b\u578b\u63a8\u5bfc：\u65e0\u9700\u8f6c\u6362
\n int* arr = new int[10];
\n MyClass* obj = new MyClass();<\/p>\n
\n \/\/ double* err = new int[10]; <\/p>\n
\n delete obj;
\n}<\/p>\n\u4e8c：\u521d\u59cb\u5316\u4e0e\u5bf9\u8c61\u7ba1\u7406<\/h3>\n
\u4e09：\u5185\u5b58\u5927\u5c0f\u8ba1\u7b97<\/h3>\n
\u56db：\u5f02\u5e38\u5904\u7406<\/h3>\n
\n#include <cstdlib>
\n#include <exception>
\nusing namespace std;<\/p>\n
\npublic:
\n Test() { cout << "\u6784\u9020\u51fd\u6570\u521d\u59cb\u5316" << endl; }
\n ~Test() { cout << "\u6790\u6784\u51fd\u6570\u6e05\u7406\u8d44\u6e90" << endl; }
\n};<\/p>\n
\n \/\/ C\u65b9\u5f0f：\u624b\u52a8\u8f6c\u6362+\u68c0\u67e5NULL
\n int* c_p = (int*)malloc(sizeof(int));
\n if (c_p) *c_p = 10;<\/p>\n
\n try {
\n Test* t = new Test(); \/\/ \u81ea\u52a8\u8c03\u7528\u6784\u9020\u51fd\u6570
\n int* cpp_p = new int(20); \/\/ \u81ea\u52a8\u63a8\u5bfc\u5927\u5c0f+\u521d\u59cb\u5316
\n delete t; \/\/ \u5148\u6790\u6784\u518d\u91ca\u653e
\n delete cpp_p;
\n } catch (const bad_alloc& e) {
\n cout << "\u5185\u5b58\u5206\u914d\u5931\u8d25：" << e.what() << endl;
\n }
\n free(c_p);
\n return 0;
\n}<\/p>\n\u5173\u952e\u5dee\u5f02\u603b\u7ed3：<\/h3>\n
\n
\u7ef4\u5ea6malloc\/freenew\/delete<\/tr>\n \n\n \u7c7b\u578b\u5b89\u5168<\/td>\n \u9700\u624b\u52a8\u7c7b\u578b\u8f6c\u6362<\/td>\n \u81ea\u52a8\u7c7b\u578b\u63a8\u5bfc<\/td>\n<\/tr>\n \n \u5bf9\u8c61\u751f\u547d\u5468\u671f<\/td>\n \u4e0d\u7ba1\u7406\u6784\u9020\/\u6790\u6784<\/td>\n \u81ea\u52a8\u8c03\u7528\u6784\u9020\/\u6790\u6784<\/td>\n<\/tr>\n \n \u5185\u5b58\u8ba1\u7b97<\/td>\n \u624b\u52a8\u8ba1\u7b97\u5b57\u8282\u6570<\/td>\n \u7f16\u8bd1\u5668\u81ea\u52a8\u8ba1\u7b97<\/td>\n<\/tr>\n \n \u9519\u8bef\u5904\u7406<\/td>\n \u8fd4\u56deNULL\u9700\u663e\u5f0f\u68c0\u67e5<\/td>\n \u629b\u51fa\u5f02\u5e38<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n","protected":false},"excerpt":{"rendered":"