Ivor Horton's Beginning Java™ 2, JDK™ 5th Edition

2.16. Exercises

You can download the source code for the examples in the book and the solutions to the following exercises from http://www.wrox.com.

1. Write a console program to define and initialize a variable of type byte to 1, and then successively multiply it by 2 and display its value 8 times. Explain the reason for the last result.

2. Write a console program to declare and initialize a double variable with some value such as 1234.5678. Then retrieve the integral part of the value and store it in a variable of type long, and the first four digits of the fractional part and store them in an integer of type short. Display the value of the double variable by outputting the two values stored as integers.

3. Write a program that defines a floating-point variable initialized with a dollar value for your income and a second floating-point variable initialized with a value corresponding to a tax rate of 35 percent. Calculate and output the amount of tax you must pay with the dollars and cents stored as separate integer values (use two variables of type int to hold the tax, perhaps taxDollars and taxCents).

4. The diameter of the Sun is approximately 865,000 miles. The diameter of the Earth is approximately 7,600 miles. Use the methods in the class Math to calculate:

   • The volume of the Earth in cubic miles

   • The volume of the Sun in cubic miles

   • The ratio of the volume of the Sun to the volume of the Earth