C++ Program to print reverse of a given number

 

What is meant by Reversing the number?

If we took a number 4567 then the reverse of the number should be 7654.

Algorithm:

Step 1: Start.

Step  2: Read n and initialize variable rev to 0.

Step  3: While n is not equal to 0 go to step 4 otherwise go to step 7.

Step  2: Find rem=n%10.

Step  2: Calculate rev=(rev*10)+ rem.

Step  2: Calculate n=n/10 and go to step 3.

Step  2: Print rev.

Step  2: Stop.

Program:

 #include <iostream>  
   
 using namespace std;  
   
 int main()  
 {  
   int n,rem,rev=0; //initializing rev to 0  
     
   cout<<"Enter a number: ";  
   cin>>n;  
     
   while(n!=0) /* loop for finding the reverse of a number */  
   {  
     rem=n%10;  
     rev=(rev*10)+rem;  
     n/=10;  // n/=10 means n=n/10
   }  
   cout<<"Reverse of the number is: "<<rev;  
     
   return 0;  
 }  

Output:

Enter a number: 4567

Reverse of the number is: 7654