C++ Program to find the Reverse of a Number

February 22, 2021

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.
C++ Program to find the Reverse of a Number

Algorithm:-

  1. Take integer number as input and store it in num
  2. we have to extract the digits of number using Modulus % operator
  3. reverse intialized to 0
  4. A  do while loop is started
    • unit digit is extracted and stored in rem

                       rem=num%10;

    •  We have to shift the reverse to left by multiplying by 10 and add remainder to it

                       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);

      5. 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
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