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pc-ip-14.c

Problem Statement

Question 14: Write a program to calculate the factorial of a number using recursive and iterative function.

Metadata

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

Concepts

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  • Recursion
  • Pointers
  • Iteration

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Source Code

#include <stdio.h>

long long int fact_rec(int);
long long int fact_ite(int);

int main()
{
    int n;
    printf("Enter the number: ");
    scanf("%d", &n);
    printf("\nFactorial of %d (Recursion): %lld", n, fact_rec(n));
    printf("\nFactorial of %d (Iteration): %lld", n, fact_ite(n));
    return 0;
}

long long int fact_ite(int n)
{
    int i, pd = 1;
    for (i = 1; i <= n; i++)
    {
        pd *= i;
    }
    return pd;
}

long long int fact_rec(int n)
{
    if (n == 0)
    {
        return 1;
    }
    else
    {
        return n * fact_rec(n - 1);
    }
}

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 (pc-ip-14.c):

    #include <stdio.h>

    long long int fact_rec(int);
    long long int fact_ite(int);

    int main()
    {
        int n;
        printf("Enter the number: ");
        scanf("%d", &n);
        printf("\nFactorial of %d (Recursion): %lld", n, fact_rec(n));
        printf("\nFactorial of %d (Iteration): %lld", n, fact_ite(n));
        return 0;
    }

    long long int fact_ite(int n)
    {
        int i, pd = 1;
        for (i = 1; i <= n; i++)
        {
            pd *= i;
        }
        return pd;
    }

    long long int fact_rec(int n)
    {
        if (n == 0)
        {
            return 1;
        }
        else
        {
            return n * fact_rec(n - 1);
        }
    }