#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;

}