Program in c language to find the sum of digits?

#include <stdio.h>
void main()
{
int digi,num,i,sum=0;


printf("Enter the number of digits:");
scanf("%d",&num);

while(i>0);
{
for(i=0;i<10000;i++)
{
digi=num;
i=digi%10;
sum=sum+i;
num=digi/10;
}
printf("The sum of digits entered is %d",sum);
}
}