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How to display numbers in reverse order in C++

Vinisha Maheshwari

In this shot, we will discuss how to display numbers in reverse order in C++.

Approach

We will use a loop to print numbers in reverse order.

Let’s look at the image below to understand it better.

Reverse Order

In the image above, we can see that the number was initially written from left to right, but it is written from right to left when we reverse the number.

We will do the same. We can use the for loop to generate code to reverse a number in C++.

Code

Let’s look at the following code snippet to understand it better.

#include <iostream>
using namespace std;

int main() {
  int number, remainder, sum = 0;
  cin >> number;
  for (int i = number; number != 0; number = number/10)
  {
    remainder = number % 10;
    sum = sum * 10 + remainder;
  }
  cout << "The number in reverse order is: " << sum << endl;
  return 0;
}

Enter the input below

(Enter a number above to generate output)

Explanation

  • In line 5, we initialize the number, remainder, and sum variables.

  • In line 6, we take the input as number.

  • From lines 7 to 11, we initialize a for loop, where we give conditions to run the loop till the number is not equal to 0. We store the value in the sum variable.

  • In line 12, we print the output stored in the variable sum.

In this way, we can use loops to reverse a number in C++.

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