Commit 270cfc
2024-03-31 14:13:00 Qwas: 新增| /dev/null .. "b/C\350\257\255\350\250\200/C\350\257\255\350\250\200malloc\345\222\214free\345\207\275\346\225\260.md" | |
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| + | # C语言malloc和free函数 |
| + | |
| + | ## malloc 使用 |
| + | |
| + | ```c |
| + | #include <stdio.h> |
| + | #include <stdlib.h> |
| + | |
| + | int main() |
| + | { |
| + | int *p = NULL; |
| + | p = malloc(sizeof(int)); // 申请空间 返回类型 void * |
| + | |
| + | if(p == NULL) |
| + | { |
| + | printf("malloc error! \n"); |
| + | exit(1); |
| + | } |
| + | *p = 10; // 在空间存值 |
| + | printf("%d\n",*p); |
| + | |
| + | free(p); // 释放内存 |
| + | |
| + | exit(0); |
| + | } |
| + | ``` |
| + | |
| + |  |
| + | |
| + | ```c |
| + | #include <stdio.h> |
| + | #include <stdlib.h> |
| + | |
| + | int main() { |
| + | int *p; |
| + | int num = 5; |
| + | int i; |
| + | |
| + | p = malloc(sizeof(int) * num); |
| + | |
| + | for (i = 0; i < num; i++) |
| + | scanf("%d", &p[i]); |
| + | |
| + | for (i = 0; i < num; i++) |
| + | printf("%d ", p[i]); |
| + | |
| + | printf("\n"); |
| + | |
| + | exit(0); |
| + | } |
| + | ``` |
| + | |
| + |  |