#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

A comprehensive course designed to help intermediate C programmers master pointers, from fundamentals to advanced pointer manipulation and practical applications.

Explore the basics of pointers, memory addresses, and pointer arithmetic in C.

Learn how pointers interact with arrays, strings, and functions, and how they enable dynamic memory management.

Tackle practical challenges involving advanced pointer concepts, including dynamic memory and multi-level pointers.

Challenge: Modify Array Elements via Pointers

Lösung

Challenge: Modify Array Elements via Pointers

Lösung