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pc-ip-16.c

Problem Statement

Question 16: Write a C program that includes a user-defined function named isArmstrong with the signature int isArmstrong(int num);.

Metadata

Property Detail
Author Amit Dutta amitdutta4255@gmail.com
Date 05 Jan 2026
License MIT License (See the LICENSE file for details)
Difficulty Beginner (index: 2 / 10)

Concepts

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  • Recursion
  • Iteration

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Source Code

#include <stdio.h>
#include <math.h>

int isArmstrong(int);

int main()
{
    int num;
    printf("Enter the number: ");
    scanf("%d", &num);
    if (isArmstrong(num))
    {
        printf("\nInput %d is a Armstrong number.", num);
    }
    else
    {
        printf("\nInput %d is not a Armstrong number.", num);
    }
    return 0;
}

int isArmstrong(int num)
{
    int temp = num;
    int power = 0;
    int result = 0;
    while (temp > 0)
    {
        power++;
        temp /= 10;
    }
    temp = num;
    while (temp > 0)
    {
        result += (int)pow((temp % 10), power);
        temp /= 10;
    }
    return result == num;
}

Explanation

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Copy the prompt below and paste it into any AI assistant.

    You are explaining a C programming code to a beginner.

    STRICT RULES:

    - Only use the given code. Do NOT assume anything not present.

    - Do NOT add extra examples.

    - Keep explanation clear and short.

    - If something is unclear, say "Not clear from code".

    - Follow the exact format below. Do NOT change headings.

    FORMAT:

    [START]

    ## What it does

    (Explain the overall purpose in 1-2 sentences)

    ## Step-by-step

    (Explain how the code works in steps, simple language)

    ## Key Concepts

    (List concepts like loop, condition, function, etc.)

    ## Notes

    (Mention any limitations, errors, or assumptions)

    [END]

    CODE (pc-ip-16.c):

    #include <stdio.h>
    #include <math.h>

    int isArmstrong(int);

    int main()
    {
        int num;
        printf("Enter the number: ");
        scanf("%d", &num);
        if (isArmstrong(num))
        {
            printf("\nInput %d is a Armstrong number.", num);
        }
        else
        {
            printf("\nInput %d is not a Armstrong number.", num);
        }
        return 0;
    }

    int isArmstrong(int num)
    {
        int temp = num;
        int power = 0;
        int result = 0;
        while (temp > 0)
        {
            power++;
            temp /= 10;
        }
        temp = num;
        while (temp > 0)
        {
            result += (int)pow((temp % 10), power);
            temp /= 10;
        }
        return result == num;
    }