Question

A) explain in brief the purpose of function prototype with the help of a suitable example.

Answer 1

The Function prototype serves the following purposes –

1) It tells the return type of the data that the function will return.
2) It tells the number of arguments passed to the function.
3) It tells the data types of the each of the passed arguments.
4) Also it tells the order in which the arguments are passed to the function.

Therefore essentially, function prototype specifies the input/output interlace to the function i.e. what to give to the function and what to expect from the function.

Prototype of a function is also called signature of the function.