Sum of Digits Example C Program

About this program

This is an example program in c calculation programs. Read the concept first: Data Types in C Programming, then study the code and output below.

Sum of Digits Definition:

Here modulus operator is used to add the digits of the input integer.

Sum of Digits Example Program

/*##Sum of Digits*/
/*##Calculation Programs, Datatype Programs, Basic Programs*/

#include <stdio.h>

int main()
{
    int inputNumber, temp, total = 0, remainder;

    printf("Enter a number whose sum is to be found : ");
    scanf("%d", &inputNumber);

    temp = inputNumber;

    while (temp != 0)
    {
        remainder = temp % 10;
        total     = total + remainder;
        temp      = temp / 10;
    }

    printf("Sum of digits of the number (%d) = %d", inputNumber, total);

    return 0;
}

Sample Output:

Enter a number whose sum is to be found : 9999
Sum of digits of the number (9999) = 36

How It Works

This C program demonstrates Sum of Digits Example C. It first reads the required values as input, then walks through the data with a loop to compute the result, and finally prints the output shown in the Sample Output above.

1. Declare the variables that hold the program’s data.
2. Read the input values that the program will work with.
3. Iterate over the data using a loop to apply the logic.
4. Print the final result to the console so you can compare it with the sample output.

Try changing the input values and re-running the program to see how the output changes — this is the fastest way to understand how the logic behaves.

Related Pages

Learn the concept first, then study the code:

• C Programs — Browse all C Programs.
• Data Types in C Programming — Concept — int, float, double and format specifiers.
• Area Of Circle Example C Program — More in c calculation programs.
• Area Of Square Example C Program — More in c calculation programs.