Page 68 - DCAP404 _Object Oriented Programming

Unit 3: Review of Functions

float b; Notes
cout <<“ Enter a number”;
cin >> b;
a = b * b; //instead of square(b); .
cout << “\nThe square of “ << b << “is “ << a;
}
Since, the code will be coded wherever it is called, the program size increases and hence requires
more memory space.

Notes However, because no function calling overhead is involved, execution becomes
fast.

Self Assessment

Fill in the blanks:

11. Inline functions are functions where the ……………. is made to inline functions.
12. The inline function takes the format as a …………………….. but when it is compiled it is
compiled as inline code.

3.4 Default Arguments

C++ functions can have arguments having default values. The default values are given in the
function prototype declaration. Whenever a call is made to a function without specifying an
argument, the program automatically assigns values to the parameters as specified in the default
function prototype declaration.
Default arguments facility allows easy development and maintenance of programs .To establish
a default value you have to use the function prototype. Because the compiler looks at the
prototype to see how many arguments a function uses, the function prototype also has to alert
the program to the possibility of default arguments. The method is to assign a value to the
argument in the prototype. The following program explains the use of default arguments:

#include <iostream.h>
void rchar (char ch = ‘*’, int num = 10);
//default arguments with values ‘*’ and 10
void main (void)
{
rchar ( );
rchar (‘=’);

rchar (‘+’, 30);
}
void rchar (char ch, int num)
{

LOVELY PROFESSIONAL UNIVERSITY 61