Java Data Type

 

JAVA

Data Types

Fill in the blanks

1.Write a int byte value 2

2.Write a float byte value 4

3.Write a long int byte value 4

4.Write a double byte value 8

5.Write a syntax of type casting  (target-type)value

 

Answer the Following Questions

                                                                             (4 marks)

1.Write a program for type conversion

class ConversionDemo{

        public static void main (String args[]){

               byte b;

              int i= 257;

               System.out.println("\nConversion of int to byte.");

              b=(byte)i;

                System.out.println("i  ="+i+" and b="+b);

             }

}

2.Write a program to compute no of seconds in 100 years

class IntegerDemo{

public static void main (String args[]){

 int years;

 int days;

 long nodays;

 long seconds;

 years = 100;

 days = 365;

 nodays=years * days;

 seconds =  nodays*24*60*60;

 System.out. println("No of seconds In"+years);

 System.out.println("years is : "+seconds);

}

}

3.Write a program to calculate the area of Circle

class DoubleDemo{

        public static void main (String args[]){

        double a;

          float r=10.8f,pi=3.1416f;

           a=pi*r*r;

         System.out.println("Area of circle is"+a);

        }

}

4. Write a program to calculate the Circumferences of Circle

class DoubleDemo{

        public static void main (String args[]){

        double a;

          float r=10.8f,pi=3.1416f;

           a=2*pi*r;

         System.out.println("Area of circle is"+a);

        }

}