How do you reverse a string in place in C or C++?

Question

How do you reverse a string in C or C++ without requiring a separate buffer to hold the reversed string?

Answer 1

But I think the XOR swap algorithm is the best...

char str[]= {"I am doing reverse string"};
char* pStr = str;

for(int i = 0; i != ((int)strlen(str)-1)/2; i++)
{
    char b = *(pStr+i);
    *(pStr+i) = *(pStr+strlen(str)-1-i);
    *(pStr+strlen(str)-1-i) = b;
}