#include<stdio.h>

#include<conio.h>

void main()

{

int num, k=1, sum=0;

clrscr();

printf("Enter the number whose digits are to be added:");

scanf("%d",&num);

while(num!=0)

{

k=num%10;

sum=sum+k;

k=num/10;

num=k;

}

printf("Sum of the digits:%d",sum);

getch();

}

Output:

Enter the number whose digits are to be added:567

Sum of the digits:18

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