USER-DEFINED METHODS - Java Programming: From Problem Analysis to Program Design - page 459

System.out.printf("Area = %.2f%n", rectangle(radius));
break ;

case 2:
System.out.print("Enter the length and the width "
+ "of the rectangle: ");
length = console.nextDouble();
width = console.nextDouble();
System.out.println();

System.out.printf("Volume = %.2f%n",
cylinder(radius, height));

break ;
default :
System.out.println("Invalid choice!");

}
switch (choice)
}

System.out.println("To run the program enter: ");
System.out.println("2: To find the area of a circle.");
System.out.println("1: To find the area of rectangle.");
System.out.println("3: To find the volume of a cylinder.");
System.out.println("-1: To terminate the program.");
choice = console.nextInt();
System.out.println();

7

}

public static double rectangle( double l, double w)
{

return l * r;

}

public static double circle( double r)
{

return Math.PI * r * w;

}

public static double cylinder( double bR, double h)
{

return Math.PI * bR * bR * l;

}

}

6. Write a method, reverseDigit , that takes an integer as a parameter and
returns the number with its digits reversed. For example, the value of
reverseDigit(12345) is 54321 . Also, write a program to test your method.