Q. C Program to Find the Sum of Digits in a Given Number.

Here you will find an algorithm and program in C programming language to find the sum of digits in number. Now let us understand this.

Explanation : Suppose we are having number 12548 and we have to calculate the sum of digits in the given number, so here we have the following digits 1, 2, 5, 4, 8 and we will sum all these digits -> 1 + 2 + 5 + 4 + 8 and the result we get is 20 that will be our output.

START
Step 1: Get number by user or declare it.
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 steps from 2 to 4 till the number is greater than 0.
STOP

C Program to Find the Sum Of Digits in Number

#include <stdio.h>
int sum_digit(long long num) 
{ 
	int sum = 0,rem; 
	while (num != 0) { 
		rem=num%10;
		num = num / 10; 
		sum=sum+rem; 
	} 
	return sum; 
} 

int main(void) 
{ 
	long long num = 123456; 
	printf("Sum Of Digits : %d", 
	sum_digit(num)); 
	return 0; 
} 

Output

Sum Of Digits : 21