标签:tps oid highlight free show targe aik cpp sizeof
#include<stdlib.h>
void *calloc(size_t n, size_t size);
free();
目前的理解: n是多少个这样的size,这样的使用类似有fread,fwrite. 这个函数把内存里面的数据清空了, free确实把本来的buf清空了,buf之后的数据是随机数据,有个问题就是free之后指针没有设置为NULL
#include <stdio.h> #include <stdlib.h> int main(void) { // calloc 1920 char* buf = (char*)calloc(1920,sizeof(char)); if (buf == NULL) { printf("calloc 分配内存失败\n"); return -1; } printf("buf is %d\n", buf[0]); printf("buf is %p\n", buf); buf[0] = 1; printf("buf is %d\n", buf[0]); free(buf); printf("buf is %p\n",buf); printf("buf is %d\n",buf[0]); buf = NULL; printf("buf is %p\n",buf); while (1) { //printf("buf is %p\n", buf); } return 0; }
标签:tps oid highlight free show targe aik cpp sizeof
原文地址:https://www.cnblogs.com/nowroot/p/12155565.html