Java Basics Excercise

Problem Statement-1:

Write a Java program to print the area and perimeter of a rectangle

Test Data :

Width = 5.5

Height = 8.5

Expected Output :

Area  = 47.60

Perimeter = 28.20

Solution:

public class Exercise1{

  public static void main(String[] strings) {

       final double width = 5.6;
       final double height = 8.5;
       double perimeter = 2*(height + width);
   double area = width * height;

System.out.println("Perimeter = %.2f \\n", height, width, perimeter);
 System.out.println("Area = %.2f \\n", width, height, area);
}}

Output:

Perimeter = 28.20
Area = 47.60

Explanation:

The class `Exercise1` consists of the fields such us `width = 5.6` and `height = 8.5` .Hence the perimeter of rectangle is 2*(height+width) and area of rectangle is width*height is calculated. The values are printed using `println()` function.

Problem Statement-2:

Write a Java program to convert double data type into long type and int type.

Test Data :

d = 166.66

Expected Data:

Before conversion: 166.66After conversion into long type: 166After conversion into int type: 166

Solution:

public class Exercise2 {
   public static void main(String args[]) {
       double d = 166.66;
       //converting double data type into long data type  
       long l = (long) d;
       //converting long data type into int data type  
       int i = (int) l;
       System.out.println("Before conversion: " + d);
       //fractional part lost  
       System.out.println("After conversion into long type: " + l);
       //fractional part lost  
       System.out.println("After conversion into int type: " + i);
   }
}

output:

Before conversion: 166.66
After conversion into long type: 166
After conversion into int type: 166

Explanation:

The class Exercise2 consists of fields such us double d = 166.66. The double type is converted into long type by using long l = (long) d and long type is converted intoint type by using

int i = (int) l. The values are printed using println() function.

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