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 of digits
num = [int(d) for d in input("Enter the Number:")]
sum = 0
for i in range(0, len(num)):
sum = sum + num[i]
print("Sum of Digits of a Number: {}".format(sum))
# This code is contributed by Shubhanshu Arya (Prepinsta Placement Cell Student)Copyright © 2021 Codeinu
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