01 #include<stdio.h>
02 
03 int main()
04 {
05     long int n;
06     long int x,s;
07 
08     printf("Enter any number : ");
09     scanf("%ld",&n);
10 
11     while(n>=10)
12     {
13         x=n;
14         s=0;
15         while(x>0)
16         {
17             s=s+(x%10);
18             x=x/10;
19         }
20         n=s;
21     }
22     printf("nSuper Digit of the given number is %ld",n);
23 
24     return 0;
25 }

 
 OUTPUT:
 
 Enter any number : 124587
 
 Super Digit of the given number is 9