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: "; cin>>n; cn = n; while(n>0) { rem=n%10; sum=sum+rem; n=n/10; } cout<<"Sum of digits of number "<< cn << " = "<<sum<<endl; return 0; }

**Output:**

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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