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P044.c

Problem Statement

Write a program to input a number and check whether the number is Pronic number or not. Pronic Number: The number which is the product of two numbers which is the product of two consecutive integer. Ex: 20 = 4 * 5

Metadata

Property Detail
Author Amit Dutta amitdutta4255@gmail.com
Date 12 Dec 2025
License MIT License (See the LICENSE file for details)
Difficulty Beginner (index: 2 / 10)

Concepts

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  • Sorting (possible)
  • Iteration

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Source Code

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

int main()
{
    int num, iterationIndex;
    bool isPronic = false;
    printf("Enter the number : ");
    if (scanf("%d", &num) != 1)
    {
        printf("\nYou have to enter a number, not an character or symbol.");
        return 1;
    }
    if (num < 1)
    {
        printf("\nOnly postive number is allowed.");
        return 1;
    }
    for (iterationIndex = 1; iterationIndex <= num / 2; iterationIndex++)
    {
        if (iterationIndex * (iterationIndex + 1) == num)
        {
            printf("\nInput %d is a Pronic Number.", num);
            isPronic = true;
            break;
        }
    }
    if(!isPronic)
    {
        printf("\nInput %d is not a Pronic Number.", num);
    }
    return 0;
}
*/

// using direct return method (more efficient and generally preferred)...

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

int main()
{
    int num, iterationIndex, iterationLimit;
    printf("Enter the number : ");
    if (scanf("%d", &num) != 1)
    {
        printf("\nYou have to enter a number, not an character or symbol.");
        return 1;
    }
    if (num < 1)
    {
        printf("\nOnly postive number is allowed.");
        return 1;
    }
    iterationLimit = (int)sqrt(num);
    for (iterationIndex = 1; iterationIndex <= iterationLimit; iterationIndex++)
    {
        if (iterationIndex * (iterationIndex + 1) == num)
        {
            printf("\nInput %d is a Pronic Number.", num);
            return 0;
        }
    }
    printf("\nInput %d is not a Pronic Number.", num);
    return 0;
}

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 (P044.c):

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

    int main()
    {
        int num, iterationIndex;
        bool isPronic = false;
        printf("Enter the number : ");
        if (scanf("%d", &num) != 1)
        {
            printf("\nYou have to enter a number, not an character or symbol.");
            return 1;
        }
        if (num < 1)
        {
            printf("\nOnly postive number is allowed.");
            return 1;
        }
        for (iterationIndex = 1; iterationIndex <= num / 2; iterationIndex++)
        {
            if (iterationIndex * (iterationIndex + 1) == num)
            {
                printf("\nInput %d is a Pronic Number.", num);
                isPronic = true;
                break;
            }
        }
        if(!isPronic)
        {
            printf("\nInput %d is not a Pronic Number.", num);
        }
        return 0;
    }
    */

    // using direct return method (more efficient and generally preferred)...

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

    int main()
    {
        int num, iterationIndex, iterationLimit;
        printf("Enter the number : ");
        if (scanf("%d", &num) != 1)
        {
            printf("\nYou have to enter a number, not an character or symbol.");
            return 1;
        }
        if (num < 1)
        {
            printf("\nOnly postive number is allowed.");
            return 1;
        }
        iterationLimit = (int)sqrt(num);
        for (iterationIndex = 1; iterationIndex <= iterationLimit; iterationIndex++)
        {
            if (iterationIndex * (iterationIndex + 1) == num)
            {
                printf("\nInput %d is a Pronic Number.", num);
                return 0;
            }
        }
        printf("\nInput %d is not a Pronic Number.", num);
        return 0;
    }