C program for "if a five digit number is input through the keyboard, write a program to calculate the sum of its digits."

Problem: C program for "if a five digit number is input through the keyboard, write a program to calculate the sum of its digits."

Logic used :

• Check the number if it is smaller than zero or not.
• Take the remainder out by modulus operator ( num % 10 ) and store it in a variable.
• Take another variable with initial value equal to 0.
• Add the remainder to that variable.
• Take the quotient out by dividing it to 10 and again store it to the variable which was initially storing the number.
• Repeat the whole step again until the number becomes less than 0.

Demo :

while ( num > 0 ) {

    m = num % 10;

    sum = sum + m;

    num = num /10 ;

}

C program : 

// Program by Shyam Kanth

#include<stdio.h>

int main(){

    int num,m,sum=0;

    printf("Enter the number : ");

    scanf("%d",&num);

    while(num>0){

        m = num%10;

        sum = sum+m;

        num = num/10;

    }

    printf("%d",sum);

    return 0;

}

Codes used :

• #include < stdio.h > : Header file for input-output
• int : Integer data type
• printf : Function for displaying message
• scanf : Functio for taking input
• while : Loop

Do comment, if any doubt

Know about me : Shyam Kanth