by Sai gowtham

How to reverse a string in C++

In this tutorial, we are going to learn about multiple ways to reverse a string in c++ programming language.

Using the reverse() function

C++ provides us a built-in reverse() function that is used to reverse a string.

The reverse() function is available inside the algorithm.h header file.

Here is an example, that reverses the following string pack to kcap.

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

int main()
{
    string str = "pack";
    reverse(str.begin(), str.end());
    cout<<"\n"<<str;
    return 0;
}

Output:

"kcap"

Using for loop

We can also reverse a string by using the for loop, where it iterates through each character of a string in the reverse order and stored it inside the new variable.

#include<iostream>
using namespace std;

int main()
{
    string str="pack";
    string reverse;
    int i;
    for(i = str.length() - 1; i >= 0; i--)
    {
        reverse += str[i];
    }
    cout<<reverse;
    return 0;
}

Using the while loop

#include<iostream>
using namespace std;

int main()
{
    string str="pack";
    string reverse;
    int i= str.length();
    while(i--)
    {
        reverse += str[i];
    }
    cout<<reverse;
    return 0;
}

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