`pc006.c`¶

Problem Statement

Prime number check

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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Recursion
Iteration

Actions¶

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Source Code¶

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

int main()
{
    int num, i, temp;
    printf("Enter the number : ");
    if(scanf("%d", &num) != 1) {
        printf("Only postive number allowed.");
        return 1;
    }
    if(num <= 0) {
        printf("\nOnly potive number are allowed.");
        return 1;
    }
    if(num == 1) {
        printf("\nInput 1 is not a prime number.");
        return 0;
    }
    if(num == 2) {
        printf("\nInput 2 is a prime number.");
        return 0;
    }
    if(num % 2 == 0) {
        printf("\nInput %d is not a prime number.", num);
        return 0;
    }
    temp = (int)sqrt(num);
    for (i = 3; i <= temp; i += 2)
    {
        if (num % i == 0)
        {
            printf("\nInput %d is not a prime number.", num);
            return 0;
        }
    }
    printf("\nInput %d is a prime number.", num);
    return 0;
}

Explanation¶

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    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 (pc006.c):

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

    int main()
    {
        int num, i, temp;
        printf("Enter the number : ");
        if(scanf("%d", &num) != 1) {
            printf("Only postive number allowed.");
            return 1;
        }
        if(num <= 0) {
            printf("\nOnly potive number are allowed.");
            return 1;
        }
        if(num == 1) {
            printf("\nInput 1 is not a prime number.");
            return 0;
        }
        if(num == 2) {
            printf("\nInput 2 is a prime number.");
            return 0;
        }
        if(num % 2 == 0) {
            printf("\nInput %d is not a prime number.", num);
            return 0;
        }
        temp = (int)sqrt(num);
        for (i = 3; i <= temp; i += 2)
        {
            if (num % i == 0)
            {
                printf("\nInput %d is not a prime number.", num);
                return 0;
            }
        }
        printf("\nInput %d is a prime number.", num);
        return 0;
    }

pc006.c¶