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P027.c

Problem Statement

Purchase Discount on Discount on Amount Laptop Desktop -------- ----------- ----------- Upto 20k 3.0% 5.0% 20001 - 50k 5.0% 7.5% 50001 - 75k 7.5% 10.5% more than 75k 10.0% 15.0% WAP to input amount of purchase and type of purchase ('L' : laptop, 'D' : desktop) and display the discount amount and the discounted price (Net Amount).

Metadata

Property Detail
Author Amit Dutta amitdutta4255@gmail.com
Date 12 Dec 2025
License MIT License (See the LICENSE file for details)
Difficulty Beginner (index: 1 / 10)

Concepts

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  • Recursion
  • Pointers

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Source Code

#include <stdio.h>
#include <ctype.h>
int main()
{
    double principal_amount, desktop_discount, laptop_discount, discount_amount, discounted_price;
    char choice;
    printf("Enter the purchase amount : ");
    scanf("%lf", &principal_amount);
    printf("Type of purchase ('L' : Laptop, 'D' : Desktop) : ");
    scanf(" %c", &choice);
    choice = toupper(choice);
    if (principal_amount <= 20000)
    {
        laptop_discount = 0.03;
        desktop_discount = 0.05;
    }
    else if (principal_amount > 20000 && principal_amount <= 50000)
    {
        laptop_discount = 0.05;
        desktop_discount = 0.075;
    }
    else if (principal_amount > 50000 && principal_amount <= 75000)
    {
        laptop_discount = 0.075;
        desktop_discount = 0.105;
    }
    else if (principal_amount > 75000)
    {
        laptop_discount = 0.1;
        desktop_discount = 0.15;
    }
    switch (choice)
    {
    case 'L':
        discount_amount = principal_amount * laptop_discount;
        discounted_price = principal_amount - discount_amount;
        printf("\nDiscount Amount : %g"
               "\nDiscounted Price : %g",
               discount_amount, discounted_price);
        break;
    case 'D':
        discount_amount = principal_amount * desktop_discount;
        discounted_price = principal_amount - discount_amount;
        printf("\nDiscount Amount : %g"
               "\nDiscounted Price : %g",
               discount_amount, discounted_price);
        break;
    default:
        printf("\nInvalid Input.");
        return 1;
    }
    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 (P027.c):

    #include <stdio.h>
    #include <ctype.h>
    int main()
    {
        double principal_amount, desktop_discount, laptop_discount, discount_amount, discounted_price;
        char choice;
        printf("Enter the purchase amount : ");
        scanf("%lf", &principal_amount);
        printf("Type of purchase ('L' : Laptop, 'D' : Desktop) : ");
        scanf(" %c", &choice);
        choice = toupper(choice);
        if (principal_amount <= 20000)
        {
            laptop_discount = 0.03;
            desktop_discount = 0.05;
        }
        else if (principal_amount > 20000 && principal_amount <= 50000)
        {
            laptop_discount = 0.05;
            desktop_discount = 0.075;
        }
        else if (principal_amount > 50000 && principal_amount <= 75000)
        {
            laptop_discount = 0.075;
            desktop_discount = 0.105;
        }
        else if (principal_amount > 75000)
        {
            laptop_discount = 0.1;
            desktop_discount = 0.15;
        }
        switch (choice)
        {
        case 'L':
            discount_amount = principal_amount * laptop_discount;
            discounted_price = principal_amount - discount_amount;
            printf("\nDiscount Amount : %g"
                   "\nDiscounted Price : %g",
                   discount_amount, discounted_price);
            break;
        case 'D':
            discount_amount = principal_amount * desktop_discount;
            discounted_price = principal_amount - discount_amount;
            printf("\nDiscount Amount : %g"
                   "\nDiscounted Price : %g",
                   discount_amount, discounted_price);
            break;
        default:
            printf("\nInvalid Input.");
            return 1;
        }
        return 0;
    }