reverse string c 2b 2b

1reverse(str.begin(),str.end());

1#include <iostream>
2#include<string>
3#include<algorithm>
4using namespace std;
5int main()
6{
7string str;
8  getline(cin,str);
9  reverse(str.begin(),str.end());
10  cout<<str;
11}

1#include <iostream>
2using namespace std;
3
4int main() {
5 
6  string greeting = "Hello";
7  int len = greeting.length();
8  int n=len-1;
9  for(int i=0;i<(len/2);i++){
10    //Using the swap method to switch values at each index
11    swap(greeting[i],greeting[n]);
12    n = n-1;
13
14  }
15  cout<<greeting<<endl;
16}

1#include <iostream>
2//The library below must be included for the reverse function to work
3#include<bits/stdc++.h> 
4using namespace std;
5
6int main() {
7  
8  string greeting = "Hello";
9  //Note that it takes the iterators to the start and end of the string as arguments
10  reverse(greeting.begin(),greeting.end());
11  cout<<greeting<<endl;
12}