巧妙使用do……while

int func(int n){int i = 0;int ret = 0;int *p = (int *)malloc(sizeof(int) * n);do{if(NULL == p) break;if(n < 0) break;for (i = 0; i < n; ++i){p[i] = i;printf("%d\n",p[i]);}ret = 1;}while(0);free(p);return ret;}

do……while

假如修改如下：

int func(int n){int i = 0;//int ret = 0;int *p = (int *)malloc(sizeof(int) * n);if(NULL == p) return 0;if(n < 0) return 0;for (i = 0; i < n; ++i){p[i] = i;printf("%d\n",p[i]);}//ret = 1;free(p);return 1;}

假如在檢測參數n時候，返回，導致記憶體泄露，沒有free(p)