Program to calculate the sum of digits entered by user in C

Q. Write a program to compute the sum of digits of a given integer number
 ==> For the following program, code goes like this :

/* Program to compute the sum of digits of a given integer number */
#include<stdio.h>
int main()
{
    int num,i,j,sum=0;
    printf("Enter a number: ");
    scanf("%d",&num);
    do
    {
        i=num/10;
        j=num%10;
        num=i;
        sum+=j;
    }while(i!=0);
    printf("\n The sum of digits is: %d ",sum);
    return 0;   
}

Output: 

How the iteration works? if the user enters 1234 as input.
num               i                           j        num     sum=0
1234    1234/10=123    1234%10=4    123    0+4=4   


123       123/10=12         123%10=3    12       4+3=7

12         12/10=1            12%10=2        1        7+2=9
1           1/10=0              1%10=1          0        9+1=10 

I have used Dev CPP to compile this program.
If you are using Turbo C++ IDE, then use conio.h in link section after stdio.h
and use getch(); to hold the output screen, just before the end of main function.
If you have any confusion regarding the program, please, comment below.
Happy Coding !
Thank you              

Share on Google Plus

About Nepali Xoro

Interested in Information Technology, Spreading Knowledge for Nepalease IT Students."Loves Traveling", Listen Music and Surfing web.