Arithmetic operators in C++ - Mini Project: Build & Apply

Arithmetic Operators Practice

📖 Scenario: You are helping a small shop calculate the total cost of items bought by a customer. You will use arithmetic operators to add, subtract, multiply, and divide numbers.

🎯 Goal: Build a simple C++ program that creates variables for item prices and quantities, calculates the total cost using arithmetic operators, and prints the result.

📋 What You'll Learn

Create variables for item prices and quantities

Create a variable for tax rate

Calculate total cost using arithmetic operators

Print the final total cost

💡 Why This Matters

🌍 Real World

Calculating prices and totals is common in shopping apps, billing systems, and financial software.

💼 Career

Understanding arithmetic operators and printing output is essential for any programming job involving calculations or data display.

1

Create item price and quantity variables

Create two double variables called price and quantity with values 5.99 and 3 respectively.

C++

#include 

int main() {
    // Create double variables price and quantity with values 5.99 and 3
    // Your code here

    return 0;
}

Need a hint?

Use double type for decimal numbers. Assign the exact values given.

2

Add a tax rate variable

Add a double variable called tax_rate and set it to 0.07 to represent 7% tax.

C++

#include 

int main() {
    double price = 5.99;
    double quantity = 3;
    // Create double variable tax_rate with value 0.07
    // Your code here

    return 0;
}

Need a hint?

Tax rate is a decimal number, so use double type.

3

Calculate total cost including tax

Create a double variable called total_cost that calculates the total price by multiplying price and quantity, then adding tax using tax_rate.

C++

#include 

int main() {
    double price = 5.99;
    double quantity = 3;
    double tax_rate = 0.07;
    // Calculate total_cost = price * quantity + (price * quantity * tax_rate)
    // Your code here

    return 0;
}

Need a hint?

Multiply price and quantity first, then add tax by multiplying with tax_rate.

4

Print the total cost

Use std::cout to print the text Total cost: followed by the value of total_cost.

C++

#include 

int main() {
    double price = 5.99;
    double quantity = 3;
    double tax_rate = 0.07;
    double total_cost = price * quantity + (price * quantity * tax_rate);
    // Print Total cost: followed by total_cost
    // Your code here

    return 0;
}

Need a hint?

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