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Program of Sum of digits in C++

This article shows that Program of Sum of digits in C++. We can write the sum of digits of number program in C++ language by the help of loop and mathematical operation only.

Sum of digits algorithm

To get sum of each digit of number by C++ program, use the following algorithm:

  • Step 1: Get number by user
  • Step 2: Get the modulus/remainder of the number
  • Step 3: sum the remainder of the number
  • Step 4: Divide the number by 10
  • Step 5: Repeat the step 2 while number is greater than 0.

Reverse Number Program in C++.

Let’s see the sum of digits program in C++.

#include <iostream>  
using namespace std;  
int main()  
int n,cn,sum=0,rem;    
cout<<"Enter a number: ";    
cn = n; 
cout<<"Sum of digits of number "<< cn << " = "<<sum<<endl;    
return 0;  


Enter a Number: 66
Sum of digits of number 66 = 12
Enter a Number: 666
Sum of digits of number 666 = 18
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