In C++, an array is a collection of elements of the same data type, stored in a contiguous block of memory. To declare an array in C++, you need to specify the data type of the elements in the array and the number of elements in the array. Here's an example of declaring an array of integers with 5 elements:

int myArray[5];

This creates an array called myArray with space for 5 integers. The elements of the array are not initialized, so their values are undefined.

To initialize an array with values, you can use an initializer list enclosed in curly braces { }. Here's an example of initializing an array with integer values:

int myArray[5] = { 1, 2, 3, 4, 5 };

This creates an array called myArray with 5 elements, initialized with the values 1, 2, 3, 4, and 5.

If you don't specify the size of the array when you declare it, you can use an initializer list to determine the size. Here's an example of creating an array of integers with an unspecified size, and initializing it with an initializer list:

int myArray[] = { 1, 2, 3, 4, 5 };

In this case, the size of the array is determined by the number of elements in the initializer list (5).

You can also initialize an array with all zero values using the following syntax:

int myArray[5] = { 0 };

This creates an array of 5 integers, all initialized with the value 0.

Note that in C++, array indices start at 0, so the first element of an array has index 0, the second element has index 1, and so on.