Question

Write a C++ program for Finding sum of digits of a number until sum becomes single digit.​

Answer 1

Answer:

$\huge \red{ \boxed{✍ Answer}}$

In this tutorial, we are going to write a program that sums digits of the given number until it becomes a single digit. Let's see an example.

• Input −4543

• Output −7

️‍️

• Let's see the steps to solve the problem.

> Initialize a number.

> Initialize the sum to 0.

> Iterate until the sum is less than 9.

> Add each digit of the number to the sum using modulo operator

> Print the sum

️‍️

️‍️

• Example

Let's see the co de.

________________________

#include <bits/stdc++.h>

using namespace std;

void findTheSingleDigit(int n)

{

int sum = 0;

while(n > 0 || sum > 9)

{

if(n == 0)

{

n = sum;

sum = 0;

}

sum += n % 10;

n /= 10;

cout << sum << endl;

<< endl;}int main()

{

int n = 4543;

findTheSingleDigit(n);

return 0;

}

_________________________

️‍️

️‍️

• Output

you execute the above program, then you will get the following result.

______________

$\huge \boxed{7}$

_______________

⭐We have another simple method to solve the problem. If the given number is divisible by 9, then the answer is 9. Else the number if n % 9.