C++ Program to find the Reverse of a Number

June 23, 2020

Program to find the Reverse of a Number

Here we will discuss how to find the reverse of a given number using C++ programming

language.

To find the reverse of a number we will use loop and arithmetic operators(%, / ).

Let’s take an example for example:

When a number say 87201 is given as an input then its output or we can say its reverse

will be 10278.

Working

Let’s see how the code works

The user gives an input.
The input will be stored in an int type variable say num
A do while loop is started
- Modulus(%) of num is founded with 10 and stored in an int type variable say rem.

rem=num%10;

- An int variable reverse(initialised at 0) is multiplied by 10 and rem is added to it and the result is stored in reverse itself.

reverse=reverse*10+rem;

- num is divided by 10 and the value is stored in num itself.

num/=10;

- The loop works until num is not equal to 0.

while(num!=0);

reverse is printed as output as it is the reverse of the number entered by the user.

C++ Code

//C++ Program
//Reverse of a number
#include <iostream>  
using namespace std;  
//main program
int main()  
{  
    //variables initialization
    int num, reverse=0, rem;    
    cout<<"Enter a number: ";    
    //user input
    cin>>num;    
    //loop to find reverse number
    do    
    {    
        rem=num%10;      
        reverse=reverse*10+rem;    
        num/=10;    
    }while(num!=0);   
    //output
    cout<<"Reversed Number: "<<reverse;     
return 0;  
}

Output

Enter a number: 1098
Reversed Number: 8901

Positive or Negative number: C | C++ | Java
Even or Odd number: C | C++ | Java
Sum of First N Natural numbers: C | C++ | Java
Sum of N natural numbers: C | C++ | Java
Sum of numbers in a given range: C | C++ | Java
Greatest of two numbers: C | C++ | Java
Greatest of the Three numbers: C | C++ | Java
Leap year or not: C | C++ | Java
Prime number: C | C++ | Java
Prime number within a given range: C | C++ | Java
Factorial of a number: C | C++ | Java
Sum of digits of a number: C | C++ | Java
Reverse of a number : C | C++ | Java
Palindrome number: C | C++ | Java
Armstrong number : C | C++ | Java
Armstrong number in a given range : C | C++ | Java
Fibonacci Series upto nth term : C | C++ | Java
Factorial of a number : C | C++ | Java
Power of a number : C | C++ | Java
Factor of a number : C | C++ | Java
Strong number : C | C++ | Java
Perfect number : C | C++ | Java
Automorphic number : C | C++ | Java
Harshad number : C | C++ | Java
Abundant number : C| C++ | Java
Friendly pair : C | C++ | Java

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