Chapter 6, Problem 11PC

Freezing and Boiling Points

The following table lists the freezing and boiling points of several substances.

Substance	Freezing Point	Boiling Point
Ethyl Alcohol	−173	172
Oxygen	−362	−306
Water	32	212

Design a class that stores a temperature in a temperature field and has the appropriate accessor and mutator methods for the field. In addition to appropriate constructors, the class should have the following methods:

• isEthylFreezing. This method should return the boolean value true if the temperature stored in the temperature field is at or below the freezing point of ethyl alcohol. Otherwise, the method should return false.
• isEthylBoiling. This method should return the boolean value t rue if the temperature stored in the temperature field is at or above the boiling point of ethyl alcohol. Otherwise, the method should return false.
• isOxygenFreezing. This method should return the boolean value true if the temperature stored in the temperature field is at or below the freezing point of oxygen. Otherwise, the method should return false.
• isOxygenBoiling. This method should return the boolean value true if the temperature stored in the temperature field is at or above the boiling point of oxygen. Otherwise, the method should return false.
• isWaterFreezing. This method should return the boolean value true if the temperature stored in the temperature field is at or below the freezing point of water. Otherwise, the method should return false.
• isWaterBoiling. This method should return the boolean value true if the temperature stored in the temperature field is at or above the boiling point of water. Otherwise, the method should return false.

Write a program that demonstrates the class. The program should ask the user to enter a temperature, and then display a list of the substances that will freeze at that temperature and those that will boil at that temperature. For example, if the temperature is -20 the class should report that water will freeze and oxygen will boil at that temperature.