C Exercises: Check whether a number is a Duck Number or not

Last update on August 05 2025 12:55:14 (UTC/GMT +8 hours)

23. Duck Number Check Variants

Write a program in C to check whether a number is a Duck Number or not.

Test Data
Input a number: 3210

Sample Solution:

C Code:

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

int main()
{
    int dno, dkno, r, flg; // Variable declaration: dno stores the original number, dkno stores the number for manipulation, r stores the remainder, flg is a flag for checking

    flg = 0; // Initializing flag to 0

    // Printing information about the program and asking for user input
    printf("\n\n Check whether a number is a Duck Number or not: \n");
    printf(" ----------------------------------------------------\n");
    printf(" Input a number: ");
    scanf("%d", &dkno); // Reading input from the user
    dno = dkno; // Storing the original number

    while (dkno > 0) // Loop to check if the number is a Duck Number
    {
        if (dkno % 10 == 0) // Checking if any digit of the number is zero
        {
            flg = 1; // Setting flag to 1 if zero is found
            break; // Exiting the loop if zero is found
        }
        dkno /= 10; // Moving to the next digit in the number
    }

    if (dno > 0 && flg == 1) // Checking if the original number is positive and a zero was found
    {
        printf(" The given number is a Duck Number.\n"); // Printing if the number is a Duck Number
    }
    else
    {
        printf(" The given number is not a Duck Number.\n"); // Printing if the number is not a Duck Number
    }

    return 0; // Returning 0 to indicate successful execution
}

Sample Output:

 Input a number: 3210                                                                                         
 The given number is a Duck Number.

Visual Presentation:

C programming: Check whether a number is a Duck Number or not.

Flowchart:

For more Practice: Solve these Related Problems:

Write a C program to determine if a number is a duck number by checking for embedded zeros.
Write a C program to verify duck numbers using string manipulation to ignore leading zeros.
Write a C program to list duck numbers and ensure numbers with leading zeros are excluded.
Write a C program to check duck number property across different numerical bases.

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