Chapter 3

Question 1

what does the if-else do?

Answer 1

First checks the expression in parentheses after the keyword if. This expression must be something that is either true or false. If it is true, the statement before the else is executed. If the expression is false, the statement after the else is executed.

Question 2

If you write if (x = y) instead of if (x == y) to test whether x and y are equal, you will get a ____ message.

Answer 2

syntax error

Question 3

What are these called? &&; , || ?

Answer 3

logical operators

Question 4

True or False, The parentheses in (pressure > min) and in (pressure < max) are not required

Answer 4

True

Question 5

True or False , You often can avoid using !, and you should do so when possible.

Answer 5

True

Question 6

if boolean expression A is true, and boolean expression B is false, A && B evaluates to

Answer 6

False

Question 7

To see whether two strings have equal values, you must use the method

Answer 7

s1.equals(s2) rather than = =

Question 8

lexicographic order means

Answer 8

the letters and other characters are ordered according to their Unicode sequence

Question 9

If we haven’t used else at the end of the loop and If none of the boolean expressions is true, what would happen?

Answer 9

nothing happenes

Question 10

What is this called System.exit(0); ?

Answer 10

The exit Method

Question 11

The Operator Precedence for booleans are:

Answer 11

the boolean operators ==, != 
the boolean operator & 
the boolean operator |
the boolean operator &&
the boolean operator ||

Question 12

True or False: you may spell true and false using either uppercase or lowercase letters or a combination of both. in nextBoolean is more forgiving.

Answer 12

True

Question 13

What comes after Switch statement?

Answer 13

switch (Controlling_expression)

Question 14

What is case label?

Answer 14

is the case that comes after the switch statement

Question 15

In switch statement, could you or could you not have a duplicate case labels?

Answer 15

you cant

Question 16

If you test a program that contains a switch statement and it executes two cases when you expect it to execute only one case, you probably have forgotten to include a

Answer 16

break statement

Question 17

If the cases of a switch statement assign values to a variable, omitting a default case can cause a

Answer 17

syntax error

Question 18

isCar ? true: false: what is this called?

Answer 18

ternary operator