Summary  
This chapter explains how to define and use an enumeration type to represent distinct levels in your code, improving readability and type safety when handling categorical data.  

General domain of usage  
User profile or access-level management in applications.

#define CATCH_CONFIG_MAIN
#include <catch2/catch.hpp>
#include <string>

// Function declaration
double calculateTotalOrder(const std::string items[], int n);

// ------------------- Tests -------------------

TEST_CASE("Order {Burger, Pizza} => total 13, no discount", "[calculateTotalOrder]") {
    std::string order[] = {"Burger", "Pizza"}; // 5 + 8 = 13
    REQUIRE(calculateTotalOrder(order, 2) == Approx(13.0));
}

TEST_CASE("Order {Hot dog, Pizza} => total 12, no discount", "[calculateTotalOrder]") {
    std::string order[] = {"Hot dog", "Pizza"}; // 4 + 8 = 12
    REQUIRE(calculateTotalOrder(order, 2) == Approx(12.0));
}

TEST_CASE("Order {Burger, Pizza, Hot dog, Pizza} => total 22.5 with 10% discount", "[calculateTotalOrder]") {
    std::string order[] = {"Burger", "Pizza", "Hot dog", "Pizza"}; // 5+8+4+8=25 â 25*0.9=22.5
    REQUIRE(calculateTotalOrder(order, 4) == Approx(22.5));
}

TEST_CASE("Order {Pizza, Pizza, Pizza} => total 21.6 with 10% discount", "[calculateTotalOrder]") {
    std::string order[] = {"Pizza", "Pizza", "Pizza"}; // 8*3=24 â 24*0.9=21.6
    REQUIRE(calculateTotalOrder(order, 3) == Approx(21.6));
}

TEST_CASE("Order {Hot dog, Hot dog, Hot dog} => total 12, no discount", "[calculateTotalOrder]") {
    std::string order[] = {"Hot dog", "Hot dog", "Hot dog"}; // 4*3=12 â no discount
    REQUIRE(calculateTotalOrder(order, 3) == Approx(12.0));
}

TEST_CASE("Empty order {} => total 0", "[calculateTotalOrder]") {
    std::string order[] = {};
    REQUIRE(calculateTotalOrder(order, 0) == Approx(0.0));
}

test.cpp

Welcome to a beginner-friendly course that will help you learn the core concepts of conditional statements . Whether you're new to programming or looking to improve your understanding of conditional statements and how they influence the flow of your programs, this course is designed to meet your needs.

This is your gateway to understanding the fundamental building blocks of decision making. Gain the essential knowledge to make your programs more intelligent and responsive.

Challenge: Fast-Food Order Calculator

解答