To find the sum of the entered number using function only

In this page I have written the program to find the sum of the entered number using function but not recursion:
It can be done in this way:

The main source code is given below:

	#include<stdio.h>
	#include<conio.h>
	int sum (int);
	int main()
	{
	int num,x;
	printf("enter the number whose sum is to be find");
	scanf("%d",&num);
	x=sum(num);
	printf("the sum of the entered number is %d",x);
	getch();
	}
	int sum(int n )
	{
	int r,s=0;
	while (n!=0)
	{
	r=n%10;
	s=s+r;
	n=n/10;
	}
	return s;
	}

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