C 语言指针问题

[HxSeek]

我觉得这样子做的话··输出的答案应该会是 s1变成bstring1 s2变成astring2才对, 可是调试的时候，发现那句话错了··请问是为什么？导致它们之间不能互相赋值?

代码如下:

include<iostream>

using namespace std;

void exchange(char *a,char *b)
{
char c;
c = *a;
*a = *b; //为什么这句话会错
*b = c;
}

int main()
{
char *s1 = "atring 1";
char *s2 = "btring 2";

exchange(s1,s2);
cout << s1 << endl;
cout << s2 << endl;

return 0;

}

[danny200309]

#include <stdio.h>
#include <iostream>

using namespace std;

void exchange(char *a, char *b)
{
char c[] = "ctring";
*c = *a;
*a = *b;
*b = *c;
}

int main()
{
char s1[] = "atring";
char s2[] = "btring";

exchange(s1,s2);
std::cout << s1 << std::endl;
std::cout << s2 << std::endl;

return 0;
}