In this program, You will learn how to find the sum of digits of a number using a function in c.

`1234 => 1 + 2 + 3 + 4 = 10`

## Example: How to find the sum of digits of a number using a function in c.

```
#include<stdio.h>
int digitSum(int n) {
int r, sum = 0;
while (n > 0) {
r = n % 10;
sum = sum + r;
n = n / 10;
}
return sum;
}
int main() {
int n, sum = 0;
printf("Enter a number:");
scanf("%d", &n);
sum = digitSum(n);
printf("Sum of digits:%d", sum);
return 0;
}
```

#### Output:

```
Enter a number:2314
Sum of digits:10
```