u014753756的博客

yum install gdb -y// demo 代码#include <stdio.h>#include <stdlib.h>#include <malloc.h>int main(){ int *a = NULL; a = (int *)malloc(sizeof(int)); *a = 255; printf("%d", malloc_usable_size(a)); free(a); return 0

可以先看看我记录的另一篇博客 寻址方式#include <stdio.h>int main() { int a = 100; char c = 'A'; printf("char占byte: %d\n", sizeof(char)); printf("int占byte: %d\n", sizeof(int)); printf("%d\n", a); printf("&a = %x\n", &a); printf("%c