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return a value: void functions, and Functions that return a value. You
can also write a function with or without parameters: An example of a
void function without parameters is provided in figure F1, line 13 to
line 17. An example of a void function with parameters is provided in
figure F2, line 8 to line 12. Defining and Calling a void Function
without Parameters You define a void function without parameters as
follows: void <function-name>( )
{
<Body-of-the-function>
}
<function-name> is the name of the function void <function-
name>( ) is the function header.
It may also be specified as follows: <Body-of-the-function>
©2011 Gilbert Ndjatou void <function-name>( void ) is the
body of the function: It consists of one or more statements that are
executed each time the function is called.
Page 169 You call a void function without parameters by using the
following statement:
<function-name> ( ); The program in figure F1 illustrates the
definition and calls of a void function without parameters. Figure F1
Defining and Calling a void Function without Parameters 1. /*-----
Program to compute the area and the perimeter of rectangles ------*/
2.
3. #include
<iostream>
4. using namespace std;
5.
6. double len,
// to hold the length of the rectangle
7.
width
// to hold the width of the rectangle
8.
area,
// to hold the area
9.
peri;