Reverse a string in place in different languages

ReverseString.c

// C
#include <stdio.h>
int main(void){
    char string[] = "elvino";
    int len = strlen(string);
    int mid = len / 2;
    len--;
    int i = 0;
    char tmp;
    while(i!=mid){
        tmp = *(string + i);
        *(string + i) = *(string + len - i);
        *(string + len - i) = tmp;
        i++;
    }
    puts(string);
}