C++ Program to Reverse a Number

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This C++ Program which displays a given number with its digits reversed. The program uses a while loop to go through each and every digit of the given number, adds it to the reversed number, multiplies it by 10 and adds them up in the loop.

Here is source code of the C++ program which displays a given number with its digits reversed. The C++ program is successfully compiled and run on a Linux system. The program output is also shown below.

  1. /*
  2.  * C++ program to Display a given Number with its Digits Reversed
  3.  */
  4. #include<iostream>
  5. using namespace std;
  6.  
  7. int main()
  8. {
  9.     int val, temp, num = 0;
  10.  
  11.     cout << "Enter the number "
  12.          << "(avoid entering numbers with leading zeroes) : ";
  13.     cin >> val;
  14.     temp = val;
  15.     while (temp != 0)
  16.     {
  17.         num = num * 10 + temp % 10;
  18.         temp = temp / 10;
  19.     }
  20.     cout << "The given number " << val
  21.          << " with its digits reversed is "
  22.          << num << endl;
  23. }

$ g++ main.cpp
$ ./a.out
Enter the number (avoid entering numbers with leading zeroes) : 1234
The given number 1234 with its digits reversed is 4321
$ ./a.out
Enter the number (avoid entering numbers with leading zeroes) : 00145
The given number 145 with its digits reversed is 541

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Manish Bhojasia, a technology veteran with 20+ years @ Cisco & Wipro, is Founder and CTO at Sanfoundry. He lives in Bangalore, and focuses on development of Linux Kernel, SAN Technologies, Advanced C, Data Structures & Alogrithms. Stay connected with him at LinkedIn.

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