Constant or const can be a price that will not change in certain period of time, unlike a variable or a phrase applied to explain information. There are various specific realizations of the general notion of a constant, with subtle distinctions that are often overlooked.

The most significant are: compile-time (statically-valued) constants, run-time (dynamically-valued) constants, immutable objects, and constant types (const). For Example, in a PHP script whenever there is a constant described it’s going to stay the exact same through the software.const int speed = 10

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Martin Cooper (inventor) Inventing handheld cellular mobile phone Making world’s first handheld cellular mobile phone call. Martin “Marty” Cooper (born December 26, 1928) is an American engineer.