Operator precedence in C++ - Mini Project: Build & Apply

Operator precedence

📖 Scenario: Imagine you are calculating the total cost of items in a shopping cart. You want to make sure the calculations happen in the right order so you get the correct total.

🎯 Goal: You will write a small C++ program that uses arithmetic operators with different precedence. You will see how the order of operations affects the final result.

📋 What You'll Learn

Create variables with exact values

Use a configuration variable for a discount rate

Write an expression that uses multiple operators to calculate the final price

Print the final calculated price

💡 Why This Matters

🌍 Real World

Calculating prices with discounts is common in shopping apps and billing systems.

💼 Career

Understanding operator precedence helps avoid bugs in financial calculations and software development.

1

Create initial variables

Create three variables: price1 with value 50, price2 with value 30, and price3 with value 20.

C++

// Your code here

Need a hint?

Use int type and assign the exact values to each variable.

2

Add a discount rate variable

Add a variable called discount of type double and set it to 0.1 (which means 10% discount).

C++

int price1 = 50;
int price2 = 30;
int price3 = 20;
// Your code here

Need a hint?

Use double type for decimal values.

3

Calculate total price with discount

Create a variable totalPrice of type double and set it to the expression (price1 + price2 + price3) * (1 - discount). This calculates the sum of prices and applies the discount.

C++

int price1 = 50;
int price2 = 30;
int price3 = 20;
double discount = 0.1;
// Your code here

Need a hint?

Use parentheses to ensure addition happens before multiplication.

4

Print the final total price

Write a std::cout statement to print the text Total price: followed by the value of totalPrice.

C++

int price1 = 50;
int price2 = 30;
int price3 = 20;
double discount = 0.1;
double totalPrice = (price1 + price2 + price3) * (1 - discount);
// Your code here

Need a hint?

Use std::cout with << to print text and variables.