```
#include<stdio.h>
int main(){
long int num,sum,r;
printf("\nEnter a number:-");
scanf("%ld",&num);
while(num>10){
sum=0;
while(num){
r=num%10;
num=num/10;
sum+=r;
}
if(sum>10)
num=sum;
else
break;
}
printf("\nSum of the digits in single digit is: %ld",sum);
return 0;
}
```

### Sample output:

Enter any number: 731

Generic root: 2

### Meaning of generic root:

It sum of digits of a number unit we don't get a single digit. For example:

Generic root of 456: 4 + 5 + 6 = 15 since 15 is two digit numbers so 1 + 5 = 6

So, generic root of 456 = 6