`lucproblem006.c`¶

Problem Statement

Write a program to find the factorial value of any number entered through the keyboard.

Metadata¶

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

Concepts¶

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Pointers
Sorting (possible)
Iteration

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Source Code¶

#include <stdio.h>
int main()
{
    int num, i = 1;
    long long fact = 1;
    printf("Enter the number : ");
    // checking if the input is valid or not
    if (scanf("%d", &num) != 1)
    {
        printf("\nPlease enter a number.");
        return 1;
    }
    // result for the negetive input
    if (num < 0)
    {
        printf("\nFactorial of %d : Undefined", num);
        return 1;
    }
    //  Hard codded result for input '0' (zero)
    if (num == 0)
    {
        printf("\nFactorial of 0 : 1");
        return 0;
    }
    // calculating result
    while (i <= num) {
        fact = fact * i;
        i++;
    }
    printf("\nFactorial of %d : %d", num, fact);
    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 (lucproblem006.c):

    #include <stdio.h>
    int main()
    {
        int num, i = 1;
        long long fact = 1;
        printf("Enter the number : ");
        // checking if the input is valid or not
        if (scanf("%d", &num) != 1)
        {
            printf("\nPlease enter a number.");
            return 1;
        }
        // result for the negetive input
        if (num < 0)
        {
            printf("\nFactorial of %d : Undefined", num);
            return 1;
        }
        //  Hard codded result for input '0' (zero)
        if (num == 0)
        {
            printf("\nFactorial of 0 : 1");
            return 0;
        }
        // calculating result
        while (i <= num) {
            fact = fact * i;
            i++;
        }
        printf("\nFactorial of %d : %d", num, fact);
        return 0;
    }

lucproblem006.c¶