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Chapter 2, Problem 7SA

Explanation of Solution

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 Solutions

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

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? String... Ch. 2 - What will the following code output? String... Ch. 2 - Convert the following pseudocode to Java code. Be... Ch. 2 - Prob. 12AW Ch. 2 - Write the code to set up all the necessary objects... Ch. 2 - Prob. 14AW Ch. 2 - A program has a float variable named total and a... Ch. 2 - Is the following comment a single-line style... Ch. 2 - Is the following comment a single-line style... Ch. 2 - Describe what the phrase self-documenting program... Ch. 2 - Prob. 4SA Ch. 2 - Prob. 5SA Ch. 2 - What does a variable declaration tell the Java... Ch. 2 - Prob. 7SA Ch. 2 - What things must be considered when deciding on a... Ch. 2 - Briefly describe the difference between variable... Ch. 2 - What is the difference between comments that start... Ch. 2 - Briefly describe what programming style means. 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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