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

void reverseArray(int *arr, int size);

TEST_CASE("Reverses even-length array in place", "[reverseArray]") {
    int arr[6] = {1, 2, 3, 4, 5, 6};
    reverseArray(arr, 6);
    REQUIRE(arr[0] == 6);
    REQUIRE(arr[1] == 5);
    REQUIRE(arr[2] == 4);
    REQUIRE(arr[3] == 3);
    REQUIRE(arr[4] == 2);
    REQUIRE(arr[5] == 1);
}

TEST_CASE("Reverses odd-length array in place", "[reverseArray]") {
    int arr[5] = {10, 20, 30, 40, 50};
    reverseArray(arr, 5);
    REQUIRE(arr[0] == 50);
    REQUIRE(arr[1] == 40);
    REQUIRE(arr[2] == 30);
    REQUIRE(arr[3] == 20);
    REQUIRE(arr[4] == 10);
}

TEST_CASE("Leaves single-element array unchanged", "[reverseArray]") {
    int arr[1] = {42};
    reverseArray(arr, 1);
    REQUIRE(arr[0] == 42);
}

TEST_CASE("Works with two-element array", "[reverseArray]") {
    int arr[2] = {100, 200};
    reverseArray(arr, 2);
    REQUIRE(arr[0] == 200);
    REQUIRE(arr[1] == 100);
}

TEST_CASE("Works with empty array (size 0)", "[reverseArray]") {
    int arr[1] = {123}; // buffer for function, but size=0
    reverseArray(arr, 0);
    REQUIRE(arr[0] == 123);
}

test.cpp

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Challenge: Reverse an Array Using Pointers

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Challenge: Reverse an Array Using Pointers

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