Skip to content

P028.c

Problem Statement

WAP to calculate factorial of a number

Metadata

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

Concepts

Beta Feature

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

  • Recursion
  • Pointers
  • Iteration

Actions

Raw View on GitHub

You can print or save this file by opening Raw and using your browser.

Source Code

#include <stdio.h>
int main()
{
    int i = 1, num, fact = 1;
    printf("Enter the number : ");
    if (scanf("%d", &num) != 1)
    {
        printf("\nPlease enter a number.");
        return 1;
    }
    if (num == 0)
    {
        printf("\nFactorial of 0 : 1");
        return 0;
    }
    if (num < 0)
    {
        printf("\nFactorial of %d : UNDEFINED", num);
        return 0;
    }
    while (i <= num)
    {
        fact = fact * i;
        i++;
    }
    printf("Factorial of %d : %d", num, 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 (P028.c):

    #include <stdio.h>
    int main()
    {
        int i = 1, num, fact = 1;
        printf("Enter the number : ");
        if (scanf("%d", &num) != 1)
        {
            printf("\nPlease enter a number.");
            return 1;
        }
        if (num == 0)
        {
            printf("\nFactorial of 0 : 1");
            return 0;
        }
        if (num < 0)
        {
            printf("\nFactorial of %d : UNDEFINED", num);
            return 0;
        }
        while (i <= num)
        {
            fact = fact * i;
            i++;
        }
        printf("Factorial of %d : %d", num, fact);
        return 0;
    }