C Exercises: Check if a number is Harshad Number or not

Last update on October 16 2025 11:04:57 (UTC/GMT +8 hours)

17. Harshad Number Check Variants

Write a program in C to check if a number is a Harshad Number or not.

Sample Solution:

C Code:

#include <stdio.h>
#include <stdlib.h>
#include <stdbool.h>

// Function to check if a number is a Harshad Number
bool chkHarshad(int n)
{
    int s = 0;
    int tmp;
    // Calculate the sum of digits of the number
    for (tmp = n; tmp > 0; tmp /= 10)
        s += tmp % 10;
    return (n % s == 0); // Return true if the number is divisible by its sum of digits
}

// Main function
int main()
{
    int hdno;
    printf("\n\n Check whether a number is a Harshad Number or not: \n");
    printf(" ---------------------------------------------------\n");
    printf(" Input a number: ");
    scanf("%d", &hdno); // Input a number

    if (chkHarshad(hdno)) // Check if the input number is a Harshad Number
        printf(" The given number is a Harshad Number.\n");
    else
        printf(" The given number is not a Harshad Number.\n");

    return 0;
}

Sample Output:

 Input a number: 9                                                                                            
 The given number is a Harshad Number.

Visual Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to determine if a number is Harshad by computing the sum of its digits.
• Write a C program to verify Harshad numbers in multiple bases and compare the results.
• Write a C program to list Harshad numbers and display the division process step-by-step.
• Write a C program to check the Harshad property using recursive digit extraction.

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