Question

define the functions ?​

Answer 1

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technical definition of a function is: a relation from a set of inputs to a set of possible outputs where each input is related to exactly one output. We can write the statement that f is a function from X to Y using the function notation f:X→Y. ...

Answer 2

Answer:

A function is a block of organized, reusable code that is used to perform a single, related action. ... Different programming languages name them differently, for example, functions, methods, sub-routines, procedures, etc.

A function prototype is the first line of the function definition that tells the program about the method and the number and type of argument.