Summary
This chapter covers defining a struct type and using arrays to store, initialize, access, and iterate over multiple instances of that type.

General domain of usage
Inventory management


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

struct Book {
    std::string title;
    std::string author;
    int pages;
};
std::string findLongestBookTitle(const std::vector<Book>& books);

TEST_CASE("Returns title of longest book in typical list", "[findLongestBookTitle]") {
    std::vector<Book> books = {
        {"Book A", "Author A", 150},
        {"Book B", "Author B", 500},
        {"Book C", "Author C", 300}
    };
    REQUIRE(findLongestBookTitle(books) == "Book B");
}

TEST_CASE("Returns title of longest book when it's the first entry", "[findLongestBookTitle]") {
    std::vector<Book> books = {
        {"Epic Tome", "Big Author", 1000},
        {"Short Story", "Quick Author", 50},
        {"Medium Read", "Average Author", 300}
    };
    REQUIRE(findLongestBookTitle(books) == "Epic Tome");
}

TEST_CASE("Returns title of longest book when last entry is longest", "[findLongestBookTitle]") {
    std::vector<Book> books = {
        {"Tiny", "A", 10},
        {"Small", "B", 20},
        {"Huge", "C", 1000}
    };
    REQUIRE(findLongestBookTitle(books) == "Huge");
}

TEST_CASE("Returns first title if multiple books have same max pages", "[findLongestBookTitle]") {
    std::vector<Book> books = {
        {"Alpha", "A", 200},
        {"Beta", "B", 200},
        {"Gamma", "C", 150}
    };
    REQUIRE(findLongestBookTitle(books) == "Alpha");
}

TEST_CASE("Returns empty string for empty vector", "[findLongestBookTitle]") {
    std::vector<Book> books;
    REQUIRE(findLongestBookTitle(books) == "");
}

test.cpp

Master the essentials of C++ structures and enumerations. Learn how to define, use, and combine structs and enums to model real-world data, and practice with hands-on coding tasks.

Explore the basics of structs in C++, including their syntax, initialization, and how they differ from classes.

Delve into more complex struct scenarios, including nesting and arrays.

Discover how enums provide named constants and how to use them effectively.

Challenge: Arrays of Structs

解答