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 prototype: The function prototype is a declaration of a function which is used to represent the return type of the function, number of arguments passed and the data type used in the function. It is same as the function header but it should be terminated with the semicolon. It should be declared previous to the “main()” function. Example for function prototype: void display(); In the above example, the function “display()” has the return type “void” and it holds the semicolon at the end. Function header: The function header is the part of the function definition which holds the return type of the function, function name and the parameter list. Semicolon should not be given at the end and the function body should be followed after the function header. Example for function header: void display() In the above example, the function “display()” holds the return type and it does not have a semicolon at the end. Function call: The statement which causes the function to execute is referred as function call. The function is called by its function name and the return type should not be specified before the function call. The semicolon should be given at the end of the function name. Example for function call: display(); In the above example, the function “display()” does not have the return type and it holds the semicolon at the end.

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Chapter 6.5, Problem 6.7CP

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 prototype:

The function prototype is a declaration of a function which is used to represent the return type of the function, number of arguments passed and the data type used in the function.

It is same as the function header but it should be terminated with the semicolon.

It should be declared previous to the “main()” function.

Example for function prototype:

void display();

In the above example, the function “display()” has the return type “void” and it holds the semicolon at the end.

Function header:

The function header is the part of the function definition which holds the return type of the function, function name and the parameter list.

Semicolon should not be given at the end and the function body should be followed after the function header.

Example for function header:

void display()

In the above example, the function “display()” holds the return type and it does not have a semicolon at the end.

Function call:

The statement which causes the function to execute is referred as function call.

The function is called by its function name and the return type should not be specified before the function call.

The semicolon should be given at the end of the function name.

Example for function call:

display();

In the above example, the function “display()” does not have the return type and it holds the semicolon at the end.

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