Sum of digits program in C++

We can write the sum of digits program in C++ language by the help of loop and mathematical operation only.

Sum of digits algorithm

To get sum of each digit 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.

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

#include <iostream>  
using namespace std;  
int main()  
{  
    int n,sum=0,m;    
    cout<<"Enter a number: ";    
    cin>>n;    
    while(n>0)    
   {    
     m=n%10;    
     sum=sum+m;    
     n=n/10;    
   }    
   cout<<"Sum is= "<<sum<<endl;    
   return 0;  
}

Output:

Enter a number: 23  

Sum is= 5

Enter a number: 624       
Sum is= 12