#include <iostream>
#include <string>
#include <algorithm>
using namespace std;

int main()
{
    string s = "hello";

    reverse(s.begin(),s.end());

    cout<<s<<endl;

    return 0;
}

#include <iostream>
using namespace std;

void Reverse(char *s,int n){
    for(int i=0,j=n-1;i<j;i++,j--){
        char c=s[i];
        s[i]=s[j];
        s[j]=c;
    }
}

int main()
{
    char s[]="hello";

    Reverse(s,5);

    cout<<s<<endl;

    return 0;
}

#include <iostream>
#include <cstring>
using namespace std;

int main()
{
    char s[]="hello";

    strrev(s);

    cout<<s<<endl;

    return 0;
}