在函数中更改指针的值 [英] Change pointer's value in function
本文介绍了在函数中更改指针的值的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我想在函数中更改变量的值. 我的代码是这样的:
I want to change the variable's value in the function. my code is like this:
void change(char *buf){
char str = "xxxxxxx";
*buf = &str;
}
int main(){
char *xxx = NULL;
change(xxx);
}
当我用valgrind调试时,它说:
when I debug with valgrind, it says:
==3709== Invalid write of size 1
==3709== at 0x80483CA: change (test.c:5)
==3709== by 0x80483E5: main (test.c:10)
==3709== Address 0x0 is not stack'd, malloc'd or (recently) free'd
==3709==
==3709==
==3709== Process terminating with default action of signal 11 (SIGSEGV)
==3709== Access not within mapped region at address 0x0
==3709== at 0x80483CA: change (test.c:5)
==3709== by 0x80483E5: main (test.c:10)
有人可以帮助我吗?我是C的新手.
Can anyone help me? I'm new in C....
推荐答案
使用指向指针的指针:
void change(char **buf)
{
*buf = "xxxxxxx";
}
int main(void)
{
char *xxx = NULL;
change(&xxx);
}
这篇关于在函数中更改指针的值的文章就介绍到这了,希望我们推荐的答案对大家有所帮助,也希望大家多多支持IT屋!
查看全文