Page 67 - DCAP404 _Object Oriented Programming

Object-oriented Programming

Notes Now the next instruction in the main program will get executed. Jumping back and forth keeping
track of where to jump means that there is an overhead in elapsed time to functions. When the
function is declared inline the compiler replaces the function call with the corresponding function
code. As a result the program does not have to spend time to jump to another location to execute
the function and then come back. But there is a memory overhead. If the function is called n
times in the program then it is copied n times making the program code or in particular executable
code large. If the value of n is large, there is a lot of memory overhead.

Task How do you tell the compiler to make a non-member function inline?

The following program demonstrates the use of inline function to calculate square of an input
number.

#include <iostream.h>
#include <conio.h>
inline float square(float a)
{
retum (a * a);
}
void main()

{
float b;
cout <<“ Enter a number”;
cin >> b;
a = square(b); .
cout << “\nThe square of “ << b << “is “ << a;
}
You should see the output as shown below.

Enter a number 1.2
The square of 1.2 is 1.44
Actually, compiler compiles the code by inserting the function definition at the place where it is
called as shown below.
#include <iostream.h>
#include <conio.h>
inline float square(float a)
{
retum (a * a);

}
void main()
{

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