To add all the digits of a number till you get a single digit.
#include<bits/stdc++.h>
using namespace std;
int digSum(int n)
{
if (n == 0)
return 0;
return (n % 9 == 0) ? 9 : (n % 9);
}
int main()
{
int n = 9999;
cout<<digSum(n);
return 0;
}sum the digits of an integer
#include <stdio.h>
int getSum(unsigned long long n) {
int sum = 0;
for (; n; n /= 10)
sum += n % 10;
return sum;
}
int main(){
printf("Sum of digits = %d\n", getSum(555));
}Copyright © 2021 Codeinu
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