Define Functions with arguments and return values?

The earlier category functions receive values from the calling function through arguments but do not send back any value rather it displays the result of calculations at the terminal and to ensure a higher degree of portability between programs, a function should in general be coded without involving any I/O operations. If the function returns a value, it can be used in diverse ways in different programs.

The nature of the mutual 2 way data communication between the calling and the called function

The following events take place when a function call is executed

(i) The function call transfers the control together with the copies of the values of actual parameters.

(ii) The called function is executed line by line until the return statement is encountered At this point, the value is passed back to main() or calling function.