int main() { int a,b; scanf("%d",&b); a=sumdigits(b); scanf("%d",&b); a+=sumdigits(b); scanf("%d",&b); a+=sumdigits(b); while(a>9) { a=sumdigits(a); } printf("%d",a); return 0; }
main( ) { long int num; printf("Enter number : "); scanf("%ld", &num); printf("%d\n",sumdigits(num)); printf("\n"); display(num); printf("\n"); Rdisplay(num); printf("\n"); }/*End of main()*/
/*Finds the sum of digits of an integer*/ int sumdigits(long int n) { if( n/10 == 0 ) /* if n is a single digit number*/ return n; return n%10 + sumdigits(n/10); }/*End of sumdigits()*/