**Write a program to find the sum of digits of a number repeatedly until a single digit occurs**

**Example**:

1647 => 1 + 6 + 4 + 7 = 18 => 1+ 8 = 9

**Input Format**

Input contains an integer N

**Output Format**

Print the final sum

**Constraint**

1<=N<=1000000

**Sample Input 1**

392

**Sample Output 1**

5

**Code:**

```
#include<stdio.h>
int main()
{
int i,n,sum=0,rem;
scanf("%d",&n);
while(n>0 || sum>9){
if(n==0){
…
return 0;
}
```

Code language: C/AL (cal)