Deck 3: Control Statements

Question 1

What is output by the following Java code segment?
Int temp = 180;
If (temp > 90)
{
System.out.println("This porridge is too hot.");
// cool down
Temp = temp - (temp > 150 ? 100 : 20);
}
Else
{
If (temp < 70)
{
System.out.println("This porridge is too cold.");
// warm up
Temp = temp + (temp < 50 ? 30 : 20);
}
}
If (temp == 80)
System.out.println("This porridge is just right!");

A) This porridge is too hot.
B) This porridge is too cold. This porridge is just right!
C) This porridge is just right!
D) None of the above.

Answer 1

D

Question 2

Which of the following is a double-selection control statement?

A) do…while
B) for
C) if…else
D) if

Answer 2

C

Question 3

Which statement is false?

A) Unless directed otherwise, the computer executes Java statements one after the other in the order in which they're written.
B) Activity diagrams normally show the Java code that implements the activity.
C) Like pseudocode, activity diagrams help programmers develop and represent algorithms.
D) The arrows in the activity diagram represent transitions, which indicate the order in which the actions represented by the action states occur.

Answer 3

B

Question 4

Which of the following is not a Java keyword?

A) do
B) next
C) while
D) for

Question 5

Which of the following is true?

A) Pseudocode is used to describe an algorithm.
B) Pseudocode is not an actual computer programming language.
C) Pseudocode is used to describe executable statements that will eventually be translated by the programmer into a program.
D) All of the above.

Question 6

Which of the following is not an algorithm?

A) A recipe.
B) Operating instructions.
C) Textbook index.
D) Shampoo instructions (lather, rinse, repeat).

Question 7

What is output by the following Java code segment?
Int temp = 180;
While (temp != 80)
{
If (temp > 90)
{
System.out.print("This porridge is too hot! ");
// cool down
Temp = temp - (temp > 150 ? 100 : 20);
}
Else
{
If (temp < 70)
{
System.out.print(
"This porridge is too cold! ");
// warm up
Temp = temp + (temp < 50 ? 30 : 20);
}
}
}
If (temp == 80)
System.out.println("This porridge is just right!");

A) This porridge is too cold! This porridge is just right!
B) This porridge is too hot! This porridge is just right!
C) This porridge is just right!
D) None of the above.

Question 8

Which of the following is not represented graphically in activity diagrams for control structures?

A) Transition arrow.
B) Attribute.
C) Action state.
D) Decision symbol.

Question 9

Which of the following is not a benefit of "goto-less programming"?

A) Easier to debug and modify
B) Shorter
C) Clearer
D) More likely to be bug free

Question 10

Which of the following would not be used to clarify a dangling-else?

A) Indentation.
B) Parentheses ().
C) Braces {}.
D) Comment //.

Question 11

Which of the following statements is true?

A) Both syntax errors and logic errors are caught by the compiler.
B) Both syntax errors and logic errors have effects at execution time.
C) Syntax errors are caught by the compiler. Logic errors have effects at execution time.
D) Logic errors are caught by the compiler. Syntax errors have effects at execution time.

Question 12

Which of the following is the shape of an action-state symbol?

A) Diamond.
B) Circle.
C) Rectangle with left and right sides replaced with arcs curving outward.
D) Rounded rectangle.

Question 13

The empty statement is denoted by what symbol?

A) Semicolon ;
B) Parentheses ()
C) Braces {}
D) Colon :

Question 14

Which of the following is not a control structure:

A) Sequence structure.
B) Selection structure.
C) Repetition structure.
D) Declaration structure.

Question 15

Which of the following statements about the conditional operator (?:) is false?

A) The conditional operator is a ternary operator, meaning that it takes three operands.
B) The first operand is a boolean expression.
C) The second operand is the result value if the condition evaluates to false.
D) The second operand is the result value if the condition evaluates to true.

Question 16

In an activity diagram, the merge symbol has the same shape as what other symbol?

A) Decision symbol.
B) Action symbol.
C) Transition arrows.
D) Initial state.

Question 17

What is output by the following Java code segment?
Int temp = 200;
If (temp > 90)
System.out.println("This porridge is too hot.");
If (temp < 70)
System.out.println("This porridge is too cold.");
If (temp == 80)
System.out.println("This porridge is just right!");

A) This porridge is too hot.
B) This porridge is too cold.
C) This porridge is just right!
D) None of the above.

Question 18

Which of the following is not an error (either a syntax error or a logic error)?

A) Neglecting to include an action in the body of a while statement that will eventually cause the condition to become false.
B) Spelling a keyword (such as while or if) with a capitalized first letter.
C) Using a condition for a while statement that is initially false.
D) An infinite loop.

Question 19

Counter-controlled repetition is also known as:

A) Definite repetition
B) Indefinite repetition
C) Multiple-repetition structure
D) Double-repetition structure

Question 20

A decision symbol in an activity diagram takes the shape of a ________.

A) Diamond.
B) Rectangle.
C) Circle.
D) Triangle.

Question 21

In Java graphics, coordinate units are measured in ________.

A) pixlets.
B) pixels.
C) points.
D) pikels.

Question 22

Java is considered a strongly typed language because:

A) The primitive types in Java are portable across all computer platforms that support Java.
B) Java requires all variables to have a type before they can be used in a program.
C) Instance variables of the primitive types are automatically assigned a default value.
D) All of the above.

Question 23

How many times is the body of the loop below executed?
Int counter = 1;
While (counter > 20)
{
// body of loop
Counter = counter - 1;
} // end while

A) 19.
B) 20.
C) 21.
D) 0.

Question 24

Sentinel-controlled repetition is also known as ________.

A) Definite repetition
B) Indefinite repetition
C) Multiple repetition
D) Double repetition

Question 25

Which primitive type can hold the largest value?

A) int
B) long
C) float
D) double

Question 26

What does the expression x %= 10 do?

A) Adds 10 to the value of x, and stores the result in x.
B) Divides x by 10 and stores the remainder in x.
C) Divides x by 10 and stores the integer result in x.
D) None of the above.

Question 27

Where can local variables declared within a method's body be used?

A) Only in that method between the line in which they were declared and the closing brace of that method.
B) Same as (a), but not within while or if statements.
C) Only within while or if statements within the method in which they were declared.
D) Anywhere within the class.

Question 28

Which of the following is not a common name for one of the three phases that a program often can be split into using pseudocode?

A) Termination phase
B) Initialization phase
C) Processing phase
D) Action phase

Question 29

Which of the following is not a primitive type?

A) char
B) float
C) String
D) int

Question 30

Keyword ________ indicates the inheritance relationship.

A) extends
B) inherits
C) super
D) parent

Question 31

Which statement is true?

A) Dividing two integers results in integer division.
B) With integer division, any fractional part of the calculation is lost.
C) With integer division, any fractional part of the calculation is truncated.
D) All of the above.

Question 32

Which of the following code segments does not increment val by 3:

A) val += 3;
B) val = val + 1; val = val + 1;
Val = val + 1;
C) c = 3; val = val + (c == 3 ? 2 : 3);
D) All of the above increment val by 3.

Question 33

What is the size in bits of an int?

A) 8
B) 16
C) 32
D) 64

Question 34

What is the result value of c at the end of the following code segment?
Int c = 8;
C++;
++c;
C %= 5;

A) 0.
B) 1.
C) 3.
D) None of the above.

Question 35

In an expression containing values of the types int and double, the ________ values are ________ to ________ values for use in the expression.

A) int, promoted, double.
B) int, demoted, double.
C) double, promoted, int.
D) double, demoted, int.

Question 36

Which of the following terms is not used to refer to a sentinel value that breaks out of a while loop?

A) signal value.
B) maximum value.
C) dummy value.
D) flag value.

Question 37

Which of the following operators associates from left to right?

A) =
B) ?:
C) %=
D) /

Question 38

Which of the following statements is false?

A) To ensure that the operands in a mixed-type expression are of the same type, Java performs implicit conversion on selected operands.
B) Cast operators are unary operators.
C) Cast operators associate from right to left and are one level lower in precedence than the multiplicative operators.
D) Cast operators are formed by placing parentheses around the name of a type.

Question 39

Local variables must be ________.

A) initialized when they're declared.
B) initialized before their values are used in an expression.
C) declared and initialized in two steps.
D) declared at the top of the method's body.