Variables: A memory space, which contains a data value, is called as variable. • The variable must be declared before it is used in the program, because Java programming language statically typed. Syntax for variable declaration: Datatype variableName1, variableName2; Here, • The “Datatype” can be “int”, “double”, “float”, “long”, “Boolean”, and “String”. • The “variableName1” and “variableName2” is the name of the variable. ○ Variable name should begin with a character, underscore (_) or dollar sign ($) and they should not start with a number. • “N” number of variables can be defined in a single declaration statement.

Question

7. Long-Distance CallsA long-distance provider charges the following rates for telephone calls: Rate Category Rate per MinuteDaytime (6:00 a.m. through 5:59 p.m.) $0.07Evening (6:00 p.m. through 11:59 p.m.) $0.12Off-Peak (midnight through 5:59 a.m.) $0.05Write a GUI application that allows the user to select a rate category (from a set of radio buttons), and enter the number of minutes of the call into an Entry widget. An info dialog box should display the charge for the call.

Answer 1

Question

Chapter 2.1, Problem 3STQ

Program Plan Intro

Variables:

A memory space, which contains a data value, is called as variable.

• The variable must be declared before it is used in the program, because Java programming language statically typed.

Syntax for variable declaration:

Datatype variableName1, variableName2;

Here,

• The “Datatype” can be “int”, “double”, “float”, “long”, “Boolean”, and “String”.

• The “variableName1” and “variableName2” is the name of the variable.

○ Variable name should begin with a character, underscore (_) or dollar sign ($) and they should not start with a number.

• “N” number of variables can be defined in a single declaration statement.

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