Chapter 17, Problem 17RQE

Program Plan Intro

Function:

One of the building blocks of C++ program is functions; it contains a group of statements which are used to perform a specific task and the executable segments in a program.

• The function “main()” is most import function in a program, because the “main()” function is the starting point of the program.
• The main advantage of using function is reusability of code and reduces the size of the program, because a function can be called for multiple numbers of times.

Function objects:

An object which is created for a class which overloads the function call operator is referred as function object.

• It resembles like a function and it can be passed as parameter to other functions.
• It is also known as “functor”.
• It can accept arguments and return values.
• Function object can be created when the class overloads the parenthesis “()” operator which is referred as “function call operator”.