EXPT NO. 2

/*    WAP to calculate area of circle */

public class MyClass1 {
 public static void main(String args[]) {
       
                 System.out.println("Enter the radius:");
                 double r=Double.parseDouble(args[0]);
                 double  area= (22*r*r)/7;           
                 System.out.println("area =" + area);
    }
   
}



/*WAP to calculate circumference of circle */

public class MyClass2 {
 public static void main(String args[]) {
       
                 System.out.println("Enter the radius:");
                 double r=Double.parseDouble(args[0]);
                 double  cir= (22*2*r)/7;           
                 System.out.println("cir= " + cir);
    }
   
}

/*    WAP to swap given two strings */

public class MyClass3 {
 public static void main(String args[]) {
                 String s1, s2,temp;
                 System.out.println("Enter both the strings :");
                 s1=args[0];
                 s2=args[1];
                  System.out.println("Strings before swapping s1="+s1+"s2="+s2);
                 temp=s1;
                  s1=s2;
                   s2=temp           
                    System.out.println("Strings after swapping s1="+s1+"s2="+s2);
    }
   
}

/*           WAP to convert temperature from Fahrenheit to Celsius */

public class MyClass4 {
 public static void main(String args[]) {
       
                 System.out.println("Enter the temperature in Fahrenheit :");
                 double f=Double.parseDouble(args[0]);

               

                double temperature = ((f - 32)*5)/9;      

               

                          System.out.println("Temperature in Celsius = " + temperature);

 

    }
   
}





/*WAP to find a square, square root, and Cube of a given no. using abstraction  */ 

abstract class Myclass
{
abstract void calculate(double x);
}
class sub1 extends Myclass
{
void calculate (double x){
System.out.println("Square of ="+x*x);
}
}
class sub2 extends Myclass
{
void calculate (double x){
System.out.println("SquareRoot of ="+Math.sqrt(x));
}
}
class sub3 extends Myclass
{
void calculate (double x){
System.out.println("cube of ="+x*x*x);
}
}
class Test
{
public static void main(String[] args)
{
sub1 obj1= new sub1();
sub2 obj2= new sub2();
sub3 obj3= new sub3();

obj1.calculate(3);
obj2.calculate(4);
obj3.calculate(5);
System.out.println("Hello World!");
}
}