Chapter 4, Problem 1RE

a.

Explanation of Solution

 Declaration for the first statement:

• The given statement is “The number of days per week”.
• Totally, there are seven days in a week and there is no change of days in a week.
• Hence, the number of days in a week is fixed forever.
• The declaration for storing the number of days in a week is as follows:

/* Declaration for storing the number of days in a week */

        public static final int DAYS_PER_WEEK = 7;

b.

Explanation of Solution

 Declaration for the second statement:

• The given statement is “The number of days until the end of the semester”.
• The number of days in a semester varies from time to time and the days may either increase or decrease based on the semester time-table.
• Hence, the number of days in a semester is an integer variable.
• The declaration for storing the number of days in a semester is as follows:

/* Declaration for storing the number of days in a semester */

        public int daysInSemester;

c.

Explanation of Solution

 Declaration for the third statement:

• The given statement is “The number of centimeters in an inch”.
• The number of centimeters in an inch is a fixed type of float value.
• The declaration for storing the number of centimeter in an inch is as follows:

/* Declaration for storing the number of centimeters in an inch */

public static final float CENTIMETERS_IN_INCH = 2.54;

d.

Explanation of Solution

 Declaration for the fourth statement:

• The given statement is “The height of the tallest person in your class, in centimeters”.
• The height of the tallest person in a class is a float value since height contains decimal values.
• The height of a person varies over time.
• Hence, the height of a person is not fixed and it is float type value.
• The declaration for storing the height of the tallest person in a class is as follows:

/* Declaration for storing the height of the tallest person in a class*/

        public float tallestHeight;