Exercise – Calculating a Sales Discount

Write a program that prompts the user to enter the price of an item and the discount offered as a percentage (on a scale of 0 to 100). The program should then calculate and display the new price.

Solution

The discount amount can be easily calculated. You must multiply the before-discount price of the product by the discount value and then divide it by 100. The division is necessary since the user enters a value for the discount on a scale of 0 to 100. Be careful—the result is not the final price but only the discount amount.

The final after-discount price can be calculated by subtracting the discount amount that you calculated beforehand from the initial before-discount price.

PHP

<?php  
  echo "Enter the price of a product: ";
  $price_before_discount = trim(fgets(STDIN));

  echo "Enter the discount offered (0 - 100): ";
  $discount = trim(fgets(STDIN));
 
  $discount_amount = $price_before_discount * $discount / 100;
  $price_after_discount = $price_before_discount - $discount_amount;
  
  echo "The price after discount is: ", $price_after_discount;
?>

<?php

echo "Enter the price of a product: ";

$price_before_discount = trim(fgets(STDIN));

echo "Enter the discount offered (0 - 100): ";

$discount = trim(fgets(STDIN));

$discount_amount = $price_before_discount * $discount / 100;

$price_after_discount = $price_before_discount - $discount_amount;

echo "The price after discount is: ", $price_after_discount;

Java

public static void main(String[] args) throws java.io.IOException {
  java.io.BufferedReader cin = new java.io.
          BufferedReader(new java.io.InputStreamReader(System.in));
  int discount;
  double discount_amount, price_after_discount, price_before_discount;

  System.out.print("Enter the price of a product: ");
  price_before_discount = Double.parseDouble(cin.readLine());

  System.out.print("Enter the discount offered (0 - 100): ");
  discount = Integer.parseInt(cin.readLine());
 
  discount_amount = price_before_discount * discount / 100;
  price_after_discount = price_before_discount - discount_amount;
  
  System.out.println("The price after discount is: " + price_after_discount);
}

public static void main(String[] args) throws java.io.IOException {

java.io.BufferedReader cin = new java.io.

BufferedReader(new java.io.InputStreamReader(System.in));

int discount;

double discount_amount, price_after_discount, price_before_discount;

System.out.print("Enter the price of a product: ");

price_before_discount = Double.parseDouble(cin.readLine());

System.out.print("Enter the discount offered (0 - 100): ");

discount = Integer.parseInt(cin.readLine());

discount_amount = price_before_discount * discount / 100;

price_after_discount = price_before_discount - discount_amount;

System.out.println("The price after discount is: " + price_after_discount);

}

C++

#include <iostream>
using namespace std;
int main() {
  int discount;
  double discount_amount, price_after_discount, price_before_discount;

  cout << "Enter the price of a product: ";
  cin >> price_before_discount;

  cout << "Enter the discount offered (0 - 100): ";
  cin >> discount;
 
  discount_amount = price_before_discount * discount / 100;
  price_after_discount = price_before_discount - discount_amount;
  
  cout << "The price after discount is: " << price_after_discount;
  return 0;
}

#include <iostream>

using namespace std;

int main() {

int discount;

double discount_amount, price_after_discount, price_before_discount;

cout << "Enter the price of a product: ";

cin >> price_before_discount;

cout << "Enter the discount offered (0 - 100): ";

cin >> discount;

discount_amount = price_before_discount * discount / 100;

price_after_discount = price_before_discount - discount_amount;

cout << "The price after discount is: " << price_after_discount;

return 0;

}

C#

static void Main() {
  int discount;
  double discount_amount, price_after_discount, price_before_discount;

  Console.Write("Enter the price of a product: ");
  price_before_discount = Double.Parse(Console.ReadLine());

  Console.Write("Enter the discount offered (0 - 100): ");
  discount = Int32.Parse(Console.ReadLine());
 
  discount_amount = price_before_discount * discount / 100;
  price_after_discount = price_before_discount - discount_amount;
  
  Console.Write("The price after discount is: " + price_after_discount);
  Console.ReadKey();
}

static void Main() {

int discount;

double discount_amount, price_after_discount, price_before_discount;

Console.Write("Enter the price of a product: ");

price_before_discount = Double.Parse(Console.ReadLine());

Console.Write("Enter the discount offered (0 - 100): ");

discount = Int32.Parse(Console.ReadLine());

discount_amount = price_before_discount * discount / 100;

price_after_discount = price_before_discount - discount_amount;

Console.Write("The price after discount is: " + price_after_discount);

Console.ReadKey();

}

Visual Basic

Sub Main()
  Dim discount As Integer
  Dim discount_amount, price_after_discount, price_before_discount As Double

  Console.Write("Enter the price of a product: ")
  price_before_discount = Console.ReadLine()

  Console.Write("Enter the discount offered (0 - 100): ")
  discount = Console.ReadLine()

  discount_amount = price_before_discount * discount / 100
  price_after_discount = price_before_discount - discount_amount

  Console.Write("The price after discount is: " & price_after_discount)

  Console.ReadKey()
End Sub

Sub Main()

Dim discount As Integer

Dim discount_amount, price_after_discount, price_before_discount As Double

Console.Write("Enter the price of a product: ")

price_before_discount = Console.ReadLine()

Console.Write("Enter the discount offered (0 - 100): ")

discount = Console.ReadLine()

discount_amount = price_before_discount * discount / 100

price_after_discount = price_before_discount - discount_amount

Console.Write("The price after discount is: " & price_after_discount)

Console.ReadKey()

End Sub

Python

price_before_discount = float(input("Enter the price of a product: "))

discount = int(input("Enter the discount offered (0 - 100): "))

discount_amount = price_before_discount * discount / 100
price_after_discount = price_before_discount - discount_amount

print("The price after discount is:", price_after_discount)

price_before_discount = float(input("Enter the price of a product: "))

discount = int(input("Enter the discount offered (0 - 100): "))

discount_amount = price_before_discount * discount / 100

price_after_discount = price_before_discount - discount_amount

print("The price after discount is:", price_after_discount)

Exercise – Calculating a Sales Discount

Solution

PHP

Java

C++

C#

Visual Basic

Python

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