c - 打印指针值

Question

#include <stdio.h>

int main(void)
{
   int x = 99;
   int *pt1;

   pt1 = &x;

   printf("Value at p1: %d\n", *pt1);
   printf("Address of p1 (with %%p): %p\n", pt1);
   printf("Address of p1 (with %%d): %d\n", pt1);

   return 0;
}

使用 %d 而不是 %p 的打印机指针值有什么缺点/危险？

Answer 1

%d 显示一个整数 - 指针的大小不需要等于整数的大小。