Programs in C language

1. Program to find the sum of individual digits of a positive integer.

#include<stdio.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();
}

Input :

7458
Output :

Sum of the digits:24