reverse string

gistfile1.cpp

#include <cstdio>
#include <cstdlib>
#include <string.h>

void reverse(char *str)
{
    char* ptr_start = str;
    char* ptr_end = str + strlen(str) - 1;

    while (ptr_start < ptr_end)
    {
        char tmp = *ptr_start;
        *ptr_start = *ptr_end;
        *ptr_end = tmp;
        ptr_start++;
        ptr_end--;
    }
}

int main() {
    char str[] = "ABCDEFGH";

    printf("str = %s\n", str);
    reverse(str);
    printf("str = %s\n", str);
}