C-Style Array Initialization

There are several ways to initialize a C-style array in C++:

Default Initialization (no initializer)

This leaves the array uninitialized, with indeterminate values:

1int arr[3];

Initializer List

This initializes the array with the provided values:

1int arr[3] = {1, 2, 3};

Uniform Initialization (since C++11)

This also initializes the array with the provided values:

1int arr[3]{1, 2, 3};

Zero Initialization

This initializes all elements to zero (or appropriate zero-equivalent for non-integral types):

1int arr[3]{};

Partial Initialization

Here, the first three elements are initialized with the provided values, and the remaining elements are zero-initialized.:

1int arr[5] = {1, 2, 3};

String Literal for char Arrays

This is a special case for initializing a char array with a string literal. It automatically includes the null terminator.

1char str[] = "Hello";

Remember, the size of the array must be known at compile time when declaring it on the stack. If you need runtime sizing, consider dynamic allocation with new[] or using std::vector.