C Exercises: Find Duck Numbers between 1 to 500

Last update on March 19 2025 12:39:13 (UTC/GMT +8 hours)

24. Duck Numbers Between 1 and 500 Variants

Write a program in C to find Duck Numbers between 1 and 500.

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
    printf("\n\n Find Duck Numbers between 1 to 500: \n");
    printf(" ----------------------------------------\n");
    printf(" The Duck numbers are: ");

    for (dkno = 1; dkno <= 500; dkno++) // Loop to find Duck Numbers from 1 to 500
    {
        dno = dkno; // Storing the original number
        flg = 0; // Resetting flag for each number

        while (dno > 0) // Loop to check if the number is a Duck Number
        {
            if (dno % 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
            }
            dno /= 10; // Moving to the next digit in the number
        }

        if (dkno > 0 && flg == 1) // Checking if the original number is positive and a zero was found
        {
            printf("%d ", dkno); // Printing the Duck Number
        }
    }

    printf("\n"); // Print a new line after displaying all Duck Numbers between 1 and 500

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

Sample Output:

The Duck numbers are: 10 20 30 40 50 60 70 80 90 100 101 102......

Visual Presentation:

Flowchart:

For more Practice: Solve these Related Problems:

• Write a C program to generate duck numbers in a specified range and count them.
• Write a C program to list duck numbers with details of their digit patterns.
• Write a C program to verify duck numbers within a user-specified upper limit.
• Write a C program to optimize the detection of duck numbers using efficient string scanning.

C Programming Code Editor:

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