Quiz 1

Quiz 1 - Apple Pricing

Overview

This quiz tests your understanding of variables, functions, and if expressions.

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The Problem

Mary is buying apples with these rules:

• Each apple costs 2 rustbucks
• If she buys more than 40, each apple costs only 1 rustbuck

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Solution

fn calculate_price_of_apples(n_apples: u64) -> u64 {
    if n_apples > 40 {
        n_apples       // 1 rustbuck each
    } else {
        2 * n_apples   // 2 rustbucks each
    }
}

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Concepts Demonstrated

Concept	Example in Solution
Function with parameter	fn calculate_price_of_apples(n_apples: u64)
Return type annotation	-> u64
If expression	if n_apples > 40 { ... } else { ... }
Implicit return	No semicolons on return expressions

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Test Cases

assert_eq!(calculate_price_of_apples(35), 70);   // 35 * 2 = 70
assert_eq!(calculate_price_of_apples(40), 80);   // 40 * 2 = 80
assert_eq!(calculate_price_of_apples(41), 41);   // 41 * 1 = 41
assert_eq!(calculate_price_of_apples(65), 65);   // 65 * 1 = 65

Note: The discount applies at more than 40, not at exactly 40!