Void指针如何在c中使用? [英] How is the Void pointer can be used in c?

问题描述

hi

这段代码是什么问题:


int main()
{
无效* p;
int * q，x;
x = 10;
q =& x;
* p = * q;
printf(％d"，* p);
getch();
返回0;
}

hi

what is the problem in this code:


int main()
{
void *p;
int *q,x;
x=10;
q=&x;
*p=*q;
printf("%d",*p);
getch();
return 0;
}

推荐答案

p 是空指针:没有大小.当您尝试打印无尺寸对象的值时，您期望发生什么?

p is a void pointer: it has no size. When you try to print the value of a sizeless object what do you expect to happen?

无论何时使用void *，通常都希望将其强制转换为所需的对象在将其用于任何用途之前.您不想将其用作void.

Whenever you''re using a void*, you typically would want to cast it to whatever you need it to be before using it for anything. You don''t want to use it as void.

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