`pc008.c`¶

Problem Statement

Factorial upto N

Metadata¶

Property	Detail
Author	Amit Dutta (amitdutta4255@gmail.com)
License	MIT
Difficulty	Beginner (index: 1 / 10)

Concepts¶

Beta Feature

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Recursion
Iteration

Actions¶

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Source Code¶

#include <stdio.h>

int main()
{
    int n, i;
    long long fact = 1;
    printf("Enter n : ");
    if (scanf("%d", &n) != 1)
    {
        printf("\nOnly non-negative number allowed.");
        return 1;
    }
    if (n < 0)
    {
        printf("\nOnly non-negative number allowed.");
        return 1;
    }
    if (n == 0)
    {
        printf("\nFactorial of 0 : 1");
        return 0;
    }
    for (i = 1; i <= n; i++)
        fact *= i;
    printf("\nFactorial of %d : %lld", n, fact);
    return 0;
}

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 (pc008.c):

    #include <stdio.h>

    int main()
    {
        int n, i;
        long long fact = 1;
        printf("Enter n : ");
        if (scanf("%d", &n) != 1)
        {
            printf("\nOnly non-negative number allowed.");
            return 1;
        }
        if (n < 0)
        {
            printf("\nOnly non-negative number allowed.");
            return 1;
        }
        if (n == 0)
        {
            printf("\nFactorial of 0 : 1");
            return 0;
        }
        for (i = 1; i <= n; i++)
            fact *= i;
        printf("\nFactorial of %d : %lld", n, fact);
        return 0;
    }

pc008.c¶