After learning how to compare strings in C using standard library functions, you are ready to apply these concepts in a practical scenario. Comparing strings is a common operation, whether you are checking for equality or determining which string comes first in dictionary order. This challenge will reinforce your understanding and help you interpret the results of string comparison functions.

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

int compare_strings(const char *str1, const char *str2);

TEST_CASE("Identical strings", "[compare_strings]") {
    REQUIRE(compare_strings("apple", "apple") == 0);
}

TEST_CASE("Lexicographical order", "[compare_strings]") {
    REQUIRE(compare_strings("apple", "banana") == -1);
    REQUIRE(compare_strings("banana", "apple") == 1);
}

TEST_CASE("Different lengths", "[compare_strings]") {
    REQUIRE(compare_strings("app", "apple") == -1);
    REQUIRE(compare_strings("apple", "app") == 1);
}

TEST_CASE("Case sensitivity", "[compare_strings]") {
    REQUIRE(compare_strings("Apple", "apple") == -1);
}

TEST_CASE("Empty string handling", "[compare_strings]") {
    REQUIRE(compare_strings("", "") == 0);
    REQUIRE(compare_strings("", "a") == -1);
}

test.cpp

Learn how strings are represented and manipulated in the C programming language. Understand the unique characteristics of C strings, including memory management, null-termination, and common string operations.

Explore how strings are represented as arrays of characters in C, the role of null-termination, and the implications for memory management.

Learn how to initialize strings, read input from the user, and output strings in C.

Explore the most frequently used string operations in C, including copying, comparison, concatenation, and length calculation.

Challenge: Comparing Strings

解答