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pc-ip-17.c

Problem Statement

Question 17: Write a C program that includes a user-defined function named isPerfect with the signature int isPerfect(int num);.

Metadata

Property Detail
Author Amit Dutta (amitdutta4255@gmail.com)
License MIT
Difficulty Beginner (index: 3 / 10)

Concepts

Beta Feature

This concept detection system is still in beta and may occasionally show incorrect or incomplete results.

  • Recursion
  • Iteration

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Source Code

#include <stdio.h>

int isPerfect(int);

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

int isPerfect(int n)
{
    int i, sum = 0;
    for (i = 1; i <= n / 2; i++)
    {
        if (n % i == 0)
        {
            sum += i;
        }
    }
    return sum == n;
}

Explanation

Explain with AI

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-17.c):

    #include <stdio.h>

    int isPerfect(int);

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

    int isPerfect(int n)
    {
        int i, sum = 0;
        for (i = 1; i <= n / 2; i++)
        {
            if (n % i == 0)
            {
                sum += i;
            }
        }
        return sum == n;
    }