Variable declaration:

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.

The declaration of variable tells the compiler about the type of data to be stored in it along with the variable name.

Syntax for variable declaration:

Datatype variableName1, variableName2;

Here,

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

The variableName is the name of the variable and it should begin with a character, underscore (_) or dollar sign ($) and they should not start with a number...

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Chapter 2, Problem 6SA

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Chapter 2 Solutions

Starting Out with Java: From Control Structures through Objects (7th Edition) (What's New in Computer Science)

Ch. 2.1 - The following program will not compile because the...Ch. 2.1 - When the program in Question 2.1 is saved to a...Ch. 2.1 - Complete the following program skeleton so it...Ch. 2.1 - On paper, write a program that will display your...Ch. 2.1 - Prob. 2.5CP Ch. 2.1 - Every Java application program must have...Ch. 2.2 - The following program will not compile because the...Ch. 2.2 - Study the following program and show what it will...Ch. 2.2 - On paper, write a program that will display your...Ch. 2.3 - Examine the following program. // This program...

Ch. 2.3 - What will the following program display on the...Ch. 2.4 - Which of the following are illegal variable names...Ch. 2.4 - Prob. 2.13CP Ch. 2.4 - Prob. 2.14CP Ch. 2.4 - Prob. 2.15CP Ch. 2.4 - A program declares a float variable named number,...Ch. 2.4 - Prob. 2.17CP Ch. 2.4 - Prob. 2.18CP Ch. 2.4 - Prob. 2.19CP Ch. 2.4 - Prob. 2.20CP Ch. 2.4 - What is wrong with the following statement? char...Ch. 2.5 - Prob. 2.22CP Ch. 2.5 - Prob. 2.23CP Ch. 2.6 - Write statements using combined assignment...Ch. 2.7 - The following declaration appears in a program:...Ch. 2.7 - The variable a is a float and the variable b is a...Ch. 2.9 - Write a statement that declares a String variable...Ch. 2.9 - Assume that stringLength is an int variable. Write...Ch. 2.9 - Prob. 2.29CP Ch. 2.9 - Prob. 2.30CP Ch. 2.9 - Prob. 2.31CP Ch. 2.11 - Prob. 2.32CP Ch. 2.11 - How are documentation comments different from...Ch. 2.14 - Prob. 2.34CP Ch. 2.14 - Write code that will display each of the dialog...Ch. 2.14 - Write code that displays an input dialog asking...Ch. 2.14 - Prob. 2.37CP Ch. 2 - Every complete statement ends with a __________....Ch. 2 - The following data 72 'A' Hello World 2.8712 are...Ch. 2 - A group of statements, such as the contents of a...Ch. 2 - Which of the following are not valid assignment...Ch. 2 - Which of the following are nor valid println...Ch. 2 - The negation operator is __________. a. unary b....Ch. 2 - This key word is used to declare a named constant....Ch. 2 - These characters mark the beginning of a...Ch. 2 - These characters mark the beginning of a...Ch. 2 - These characters mark the beginning of a...Ch. 2 - Which Scanner class method would you use to read a...Ch. 2 - Which Scanner class method would you use to read a...Ch. 2 - You can use this class to display dialog boxes. a....Ch. 2 - Prob. 14MC Ch. 2 - Prob. 15MC Ch. 2 - True or False: A left brace in a Java program is...Ch. 2 - True or False: A variable must be declared before...Ch. 2 - True or False: Variable names may begin with a...Ch. 2 - True or False: You cannot change the value of a...Ch. 2 - True or False: Comments that begin with / / can be...Ch. 2 - True or False: If one of an operators operands is...Ch. 2 - What will the following code segments print on the...Ch. 2 - int x = 0, y=2; x = y 4; System.out.println(x +...Ch. 2 - System.out.print(I am the incredible);...Ch. 2 - System.out.print(Be careful\n);...Ch. 2 - int a, x = 23; a = x % 2; System.out.println(x +...Ch. 2 - Find the Error There are a number of syntax errors...Ch. 2 - Show how the double variables temp, weight, and...Ch. 2 - Prob. 2AW Ch. 2 - Write assignment statements that perform the...Ch. 2 - Assume the variables result, w, x, y, and z are...Ch. 2 - Prob. 5AW Ch. 2 - Modify the following program so it prints two...Ch. 2 - What will the following code output? int apples =...Ch. 2 - What will the following code output? double d =...Ch. 2 - What will the following code output? 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Why...Ch. 2 - Assume that a program uses the named constant PI...Ch. 2 - Assume the file Sales Average, java is a Java...Ch. 2 - Prob. 14SA Ch. 2 - Name, Age, and Annual Income Write a program that...Ch. 2 - Name and Initials Write a program that has the...Ch. 2 - Personal Information Write a program that displays...Ch. 2 - Star Pattern Write a program that displays the...Ch. 2 - Sales Prediction The East Coast sales division of...Ch. 2 - Land Calculation One acre of land is equivalent to...Ch. 2 - Sales Tax Write a program that will ask the user...Ch. 2 - Cookie Calories A bag of cookies holds 40 cookies....Ch. 2 - Miles-per-Gallon A cars miles-per-gallon (MPG) can...Ch. 2 - Test Average Write a program that asks the user to...Ch. 2 - Circuit Board Profit An electronics company sells...Ch. 2 - Prob. 12PC Ch. 2 - Restaurant Bill Write a program that computes the...Ch. 2 - Male and Female Percentages Write a program that...Ch. 2 - Stock Commission Kathryn bought 600 shares of...Ch. 2 - Energy Drink Consumption A soft drink company...Ch. 2 - Ingredient Adjuster A cookie recipe calls for the...Ch. 2 - Word Game Write a program that plays a word game...Ch. 2 - Stock Transaction Program Last month Joe purchased...Ch. 2 - Planting Grapevines A vineyard owner is planting...Ch. 2 - Compound Interest When a bank account pays...

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Solution Summary: The author explains that variable declaration tells the compiler about the type of data to be stored in it along with the variable name.

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Chapter 2 Solutions