Program to add n digit number e .g 123 = 6 or 4567 = 21 etc

#include "stdio.h''

#include ''conio.h''

main() {

signed long int num,sum=0,digit;

printf("enter digits = ");

scanf("%ld",&num);





while(num%10) {



digit=num%10;

sum+=digit;

num/=10;



}

printf("Digit sum = %ld",sum);

getch();

}

 

 

OUTPUT : -

 

enter digits = 123

Digit sum = 6

 

enter digits = 123456789

Digit sum = 45

 

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