сумма цифр числа

#include <stdio.h>
#include <conio.h>
int Summa(int N)
{
int d,sum=0;
while(N!=0)
   {
    d=N%10;
    sum=sum+d;
    N=N/10;
   }
return sum;
}
main()
{
int N,S;
printf("Enter integer to find the sum of its digits: \n");
scanf("%d", N);
S=Summa(N);
printf("Sum of digints is %d", S);
getch();
}