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APC-PRAC-033.c

Problem Statement

Print the factorial of the digits off a number

Metadata

Property Detail
Author Amit Dutta (amitdutta4255@gmail.com)
License MIT
Difficulty Beginner (index: 2 / 10)

Concepts

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  • Recursion
  • Iteration

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Source Code

#include <stdio.h>

int factorial(int);

int factorial(int n)
{
    int i, fact = 1;
    for (i = 1; i <= n; i++)
        fact *= i;
    return fact;
}

int main()
{
    int n, temp;
    printf("Enter the number: ");
    scanf("%d", &n);
    if (n < 0)
    {
        printf("Only non-negetive number is allowed.");
        return 1;
    }
    temp = n;
    while (temp > 0)
    {
        printf("\nFactorial of %d: %d", temp % 10, factorial(temp % 10));
        temp /= 10;
    }
    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 (APC-PRAC-033.c):

    #include <stdio.h>

    int factorial(int);

    int factorial(int n)
    {
        int i, fact = 1;
        for (i = 1; i <= n; i++)
            fact *= i;
        return fact;
    }

    int main()
    {
        int n, temp;
        printf("Enter the number: ");
        scanf("%d", &n);
        if (n < 0)
        {
            printf("Only non-negetive number is allowed.");
            return 1;
        }
        temp = n;
        while (temp > 0)
        {
            printf("\nFactorial of %d: %d", temp % 10, factorial(temp % 10));
            temp /= 10;
        }
        return 0;
    }