A program to find sum of digits repeatedly until a single digit is obtained?

Answer 1

#include<stdio.h>

#include<conio.h>

main()

{

int n,s=0,sum=0,i,d;

printf("enter the number");

scanf("%d",&n);

while(n>0)

{

d=n%10;

s=s+d;

n=n/10;

}

while(s>0)

{

i=s%10;

sum=sum+i;

s=s/10;

}

printf("%d",sum);

getch();

}