Operator precedence in R Programming - Mini Project: Build & Apply

Operator precedence

📖 Scenario: Imagine you are calculating the total cost of items in a shopping cart with discounts and taxes. You need to understand how R calculates expressions with different operators.

🎯 Goal: Learn how operator precedence affects the result of arithmetic expressions in R by creating variables and calculating values step-by-step.

📋 What You'll Learn

Create variables with exact numeric values

Use arithmetic operators with correct precedence

Use parentheses to change precedence

Print the final calculated result

💡 Why This Matters

🌍 Real World

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

💼 Career

Understanding operator precedence helps avoid bugs in financial calculations and data analysis.

1

Create initial price variables

Create three variables called price1, price2, and price3 with values 100, 50, and 25 respectively.

R Programming

# Create variables price1, price2, and price3 with values 100, 50, and 25
# Your code here

Need a hint?

Use the assignment operator <- to assign values to variables.

2

Create discount and tax rate variables

Create two variables called discount and tax_rate with values 0.1 and 0.05 respectively.

R Programming

price1 <- 100
price2 <- 50
price3 <- 25
# Create variables discount and tax_rate with values 0.1 and 0.05
# Your code here

Need a hint?

Remember to use <- to assign values.

3

Calculate total price with operator precedence

Create a variable called total_price that calculates the sum of price1, price2, and price3, then applies the discount, and finally adds tax. Use the expression: (price1 + price2 + price3) * (1 - discount) * (1 + tax_rate).

R Programming

price1 <- 100
price2 <- 50
price3 <- 25
discount <- 0.1
tax_rate <- 0.05
# Calculate total_price using operator precedence
# Your code here

Need a hint?

Use parentheses to control the order of operations.

4

Print the total price

Write a print() statement to display the value of total_price.

R Programming

price1 <- 100
price2 <- 50
price3 <- 25
discount <- 0.1
tax_rate <- 0.05
total_price <- (price1 + price2 + price3) * (1 - discount) * (1 + tax_rate)
# Print the total_price
# Your code here

Need a hint?

Use print(total_price) to show the result.