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To define a global array—one introduced outside of the definition of any function—you need to supply an array definition that tells C++ the name of the array, the type of objects that the array is to contain, the number of dimensions the array has, and the size of each dimension. The C++ compiler uses array definitions to calculate how much storage to allocate for the array.
The following array definition, for example, tells the C++ compiler to
allocate memory for a one-dimensional array containing five
integers of type int, each of which represents a distance
to be traveled by a train:
*-- Specifies that the array contains integer objects | | *-- Specifies that the name of the array is distances | | | | *-- Specifies that the array contains five objects | | | v v v int distances[5];