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

int _testmain();


void double_elements(int *arr, int size);

TEST_CASE("Doubles positive integers", "[double_elements]") {
    int arr[] = {1, 2, 3, 4, 5};
    double_elements(arr, 5);
    REQUIRE(arr[0] == 2);
    REQUIRE(arr[1] == 4);
    REQUIRE(arr[2] == 6);
    REQUIRE(arr[3] == 8);
    REQUIRE(arr[4] == 10);
}

TEST_CASE("Doubles zeros", "[double_elements]") {
    int arr[] = {0, 0, 0, 0};
    double_elements(arr, 4);
    REQUIRE(arr[0] == 0);
    REQUIRE(arr[1] == 0);
    REQUIRE(arr[2] == 0);
    REQUIRE(arr[3] == 0);
}

TEST_CASE("Doubles negative integers", "[double_elements]") {
    int arr[] = {-1, -2, -3};
    double_elements(arr, 3);
    REQUIRE(arr[0] == -2);
    REQUIRE(arr[1] == -4);
    REQUIRE(arr[2] == -6);
}

TEST_CASE("Original array is modified in place", "[double_elements]") {
    int arr[] = {7, 8};
    double_elements(arr, 2);
    REQUIRE(arr[0] == 14);
    REQUIRE(arr[1] == 16);
}

test.cpp

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Challenge: Modify Array Elements via Pointers

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