reverse

#include <iostream>
#include<cstring>

using namespace std;

void reverse(char *&s)
{
    int length = strlen(s) ;
    int c, i, j;

    for (i = 0, j = length - 1; i < j; i++, j--)
    {
        c = s[i];
        s[i] = s[j];
        s[j] = c;
    }
}

int main() {
	char *str="hello";
	cout<<str;
	reverse(str);
	cout<<str;
	// your code goes here
	return 0;
}