Question

Calculate the sum of digits of a number given by the user. E.g.- INUPT :123 OUPUT : 6 INUPT :12345 OUPUT : 15

Answer 1

Explanation:

// C++ program to find sum of

// digits of a number until

// sum becomes single digit.

#include<bits/stdc++.h>

using namespace std;

int digSum(int n)

{

int sum = 0;

// Loop to do sum while

// sum is not less than

// or equal to 9

while(n > 0 || sum > 9)

{

if(n == 0)

{

n = sum;

sum = 0;

}

sum += n % 10;

n /= 10;

}

return sum;

}

// Driver program to test the above function

int main()

{

int n = 1234;

cout << digSum(n);

return 0;

}