Solution Manual For Java How To Program, Early Objects (11th Edition) (Deitel: How To Program) 11th Edition Download
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Solution Manual for Java How to Program, Early Objects (11th
Edition) (Deitel: How to Program) 11th Edition Pdf Download
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Introduction to Java
Applications; Input/Output
and Operators 2
What’s in a name?
That which we call a rose
By any other name would
smell as sweet.
—William Shakespeare
Ob je cti v e s
In this chapter you’ll:
■ Write simple Java
applications.
■ Use input and output
statements.
■ Learn about Java’s primitive
types.
■ Understand basic memory
concepts.
■ Use arithmetic operators.
■ Learn the precedence of
arithmetic operators.
■ Write decision-making
statements.
■ Use relational and equality
operators.
jhtp_02_IntroToApplications.FM Page 2 Sunday, May 18, 2014 9:41 PM
Self-Review Exercises 2
Self-Review Exercises
2.1 Fill in the blanks in each of the following statements:
a) A(n) begins the body of every method, and a(n) ends the body of
every method.
ANS: left brace ({), right brace (} ).
b) You can use the statement to make decisions.
ANS: if.
c) begins an end-of-line comment.
ANS: //.
d) , and are called white space.
ANS: Space characters, newlines and tabs.
e) are reserved for use by Java.
ANS: Keywords.
f) Java applications begin execution at method .
ANS: main.
g) Methods , and display information in a command win-
dow.
ANS: System.out.print, System.out.println and System.out.printf.
2.2 State whether each of the following is true or false. If false, explain why.
a) Comments cause the computer to print the text after the // on the screen when the pro-
gram executes.
ANS: False. Comments do not cause any action to be performed when the program exe-
cutes. They’re used to document programs and improve their readability.
b) All variables must be given a type when they’re declared.
ANS: True.
c) Java considers the variables number and NuMbEr to be identical.
ANS: False. Java is case sensitive, so these variables are distinct.
d) The remainder operator (%) can be used only with integer operands.
ANS: False. The remainder operator can also be used with noninteger operands in Java.
e) The arithmetic operators *, /, %, + and - all have the same level of precedence.
ANS: False. The operators *, / and % are higher precedence than operators + and -.
2.3 Write statements to accomplish each of the following tasks:
a) Declare variables c, thisIsAVariable, q76354 and number to be of type int.
ANS: int c, thisIsAVariable, q76354, number;
or
int c;
int thisIsAVariable;
int q76354;
int number;
b) Prompt the user to enter an integer.
ANS: System.out.print("Enter an integer: ");
c) Input an integer and assign the result to int variable value. Assume Scanner variable
input can be used to read a value from the keyboard.
ANS: value = input.nextInt();
d) Print "This is a Java program" on one line in the command window. Use method
System.out.println.
ANS: System.out.println("This is a Java program");
jhtp_02_IntroToApplications.FM Page 3 Sunday, May 18, 2014 9:41 PM
e) Print "This is a Java program" on two lines in the command window. The first line
should end with Java. Use method System.out.printf and two %s format specifiers.
ANS: System.out.printf("%s%n%s%n", "This is a Java", "program");
f) If the variable number is not equal to 7, display "The variable number is not equal to 7".
ANS: if (number != 7)
System.out.println("The variable number is not equal to 7");
2.4 Identify and correct the errors in each of the following statements:
a) if (c < 7);
System.out.println("c is less than 7");
ANS: Error: Semicolon after the right parenthesis of the condition (c < 7) in the if.
Correction: Remove the semicolon after the right parenthesis. [Note: As a result, the
output statement will execute regardless of whether the condition in the if is true.]
b) if (c => 7)
System.out.println("c is equal to or greater than 7");
ANS: Error: The relational operator => is incorrect. Correction: Change => to >=.
2.5 Write declarations, statements or comments that accomplish each of the following tasks:
a) State that a program will calculate the product of three integers.
ANS: // Calculate the product of three integers
b) Create a Scanner called input that reads values from the standard input.
ANS: Scanner input = new Scanner(System.in);
c) Declare the variables x, y, z and result to be of type int.
ANS: int x, y, z, result;
or
int x;
int y;
int z;
int result;
d) Prompt the user to enter the first integer.
ANS: System.out.print("Enter first integer: ");
e) Read the first integer from the user and store it in the variable x.
ANS: x = input.nextInt();
f) Prompt the user to enter the second integer.
ANS: System.out.print("Enter second integer: ");
g) Read the second integer from the user and store it in the variable y.
ANS: y = input.nextInt();
h) Prompt the user to enter the third integer.
ANS: System.out.print("Enter third integer: ");
i) Read the third integer from the user and store it in the variable z.
ANS: z = input.nextInt();
j) Compute the product of the three integers contained in variables x, y and z, and assign
the result to the variable result.
ANS: result = x * y * z;
k) Use System.out.printf to display the message "Product is" followed by the value of
the variable result.
ANS: System.out.printf("Product is %d%n", result);
jhtp_02_IntroToApplications.FM Page 4 Sunday, May 18, 2014 9:41 PM
Exercises 4
2.6 Using the statements you wrote in Exercise 2.5, write a complete program that calculates
and prints the product of three integers.
ANS:
Exercises
NOTE: Solutions to the programming exercises are located in the ch02solutions folder.
Each exercise has its own folder named ex02_## where ## is a two-digit number represent-
ing the exercise number. For example, exercise 2.14’s solution is located in the folder
ex02_14.
2.7 Fill in the blanks in each of the following statements:
a) are used to document a program and improve its readability.
ANS: Comments.
b) A decision can be made in a Java program with a(n) .
ANS: if statement.
c) Calculations are normally performed by statements.
ANS: assignment statements.
d) The arithmetic operators with the same precedence as multiplication are and
.
jhtp_02_IntroToApplications.FM Page 5 Sunday, May 18, 2014 9:41 PM
Exercises 6
a) x = 7 + 3 * 6 / 2 - 1;
ANS: *, /, +, -; Value of x is 15.
b) x = 2 % 2 + 2 * 2 - 2 / 2;
ANS: %, *, /, +, -; Value of x is 3.
c) x = (3 * 9 * (3 + (9 * 3 / (3))));
ANS: x = ( 3 * 9 * ( 3 + ( 9 * 3 / ( 3 ) ) ) );
4 5 3 1 2
Value of x is 324.
2.19 What does the following code print?
System.out.printf("*%n**%n***%n****%n*****%n");
ANS:
*
**
***
****
*****
ANS:
*
***
*****
****
**
ANS:
***************
System.out.println("*****");
System.out.print("****");
System.out.println("**");
ANS:
****
*****
******
ANS:
*
***
*****
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