Page 258 - ComputerScience_Class_11

The differences between pure and impure method are as follows:
Pure Method Impure Method
There is no change in the state of an object. There is a change in the state of an object.
A pure method is a returnable method. An impure method may or may not return a value.

It is also known as Accessor. It is also known as Mutator.

9.8 METHOD OVERLOADING
Sometimes, more than one method may have the same name. But this may lead to confusion for the compiler about
the function to be called. So, to counter this problem, there should be some difference in their arguments. So, these
methods (with the same names) should have either.
• Different type of parameters, or
• Different number of parameters
Let us consider the following program.

Program 8 Write a program that calculates area of circle, square and rectangle.

1 class FunctionOverloading
2 {
3 void area(double r)
4 {
5 double ar = 3.142 * r * r;

6 System.out.println("The Area of a Circle: " + ar);
7 }
8 void area(int s)
9 {

10 int ar = s * s;
11 System.out.println("The Area of a Square: " + ar);
12 }
13 void area(int l, int b)
14
{
15 int ar = l * b;
16 System.out.println("The Area of a Rectangle: " + ar);
17 }
18 public static void main(String[] args)
19 {

20 FunctionOverloading obj = new FunctionOverloading();
21 obj.area(5.6);
22 obj.area(5, 2);
23 obj.area(5);
24 }

25 }

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