Deck 5: Control Statements: Part 1

Question 1

Which statement is false

A) Unless directed otherwise, the computer executes C# statements one after the other in the order in which they are written.
B) Activity diagrams normally show the C# 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 1

B

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

Control statements are helpful in building and manipulating objects.

Answer 3

True

Question 4

Pseudocode helps you conceptualize a program during the design process.

Question 5

Pseudocode must be written in an editor capable of understanding it and the language to which it pertains.

Question 6

What kind of language is pseudocode

A) a hybrid language of all .NET languages
B) an artificial language used to develop algorithms
C) a language used to translate from C++ to C#
D) None of the above.

Question 7

Which of the following is not an algorithm

A) a recipe
B) operating instructions
C) textbook index
D) shampoo instructions (lather, rinse, repeat)

Question 8

A transfer of control occurs when:

A) a program changes from input to output, or vice versa
B) a logic error occurs in a program
C) a statement other than the next one in the program executes
D) None of the above.

Question 9

Pseudocode is most comparable to which of the following languages

A) C#
B) C
C) Pascal
D) English

Question 10

The order of actions of an algorithm is irrelevant.

Question 11

The three types of selection structures are:

A) foreach, for and switch
B) if, for and switch
C) if, if/else and while
D) if, if/else and switch

Question 12

It is essential to have an understanding of a problem before writing a program to solve it.

Question 13

Programs can be written,compiled and executed with pseudocode.

Question 14

Pseudocode normally describes only executable statements.

Question 15

The lines in an activity diagram are a graphical representation of an algorithm.

Question 16

Which of the following is not a benefit of "goto-free programs"

A) easier to debug and modify
B) shorter
C) clearer
D) more likely to be bug free

Question 17

Program control is best defined as:

A) specifying the degree of control a program has over the computer it is executed on
B) specifying the line of code that is executing at a given time
C) specifying the order in which the statements are executed
D) None of the above.

Question 18

Sequential execution is when statements execute one after the other in the order in which they appear in the program.

Question 19

Which of the following is a type of control structure

A) declaration structure
B) repetition structure
C) flow structure
D) All of the above.

Question 20

What is an algorithm

A) the actions (and their order) that solve a particular problem
B) an English description of a problem to be solved
C) the process of converting between data types
D) None of the above.

Question 21

The sequence structure is built into C#.Unless directed otherwise,the computer ex
ecutes C# statements one after the other in the order in which they are written.

Question 22

The best way to use braces is to go back and insert them after all the code has been written.

Question 23

What is output by the following C# code segment
Int temp = 200;
If (temp > 90)
{
Console.WriteLine("This porridge is too hot.");
}
If (temp < 70)
{
Console.WriteLine("This porridge is too cold.");
}
If (temp == 80)
{
Console.WriteLine("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 24

A set of statements contained in a pair of braces can be placed anywhere in a program at which a single statement can be placed.

Question 25

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

A) diamond
B) rectangle
C) circle
D) question mark

Question 26

The first operand of the ternary operator is the condition.

Question 27

The conditional operator is of the highest precedence.

Question 28

Control structures cannot be placed inside other control structures.

Question 29

if is a _________ statement.

A) restricted
B) selection
C) repetition
D) unrestricted

Question 30

What capability does if…else provide that if does not

A) the ability to execute actions when the condition is true and false
B) the ability to nest structures
C) the ability to stack structures
D) None of the above.

Question 31

is C#'s only ternary operator.

A) *
B)
C) =
D) //

Question 32

C#'s type is capable of holding the value true or false.

A) bool
B) int
C) if
D) logic

Question 33

Syntax errors cause a program to fail and terminate prematurely.

Question 34

The if statement is a repetition statement.

Question 35

The body of an if statement executes only if the condition is evaluated as true.

Question 36

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 bool 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 37

A selection statement chooses among alternative courses of action.

Question 38

Which of the following is not included in an activity diagram for a control statement

A) transition arrows
B) attribute
C) action state
D) decision symbols

Question 39

The C# compiler always associates an else with the previous if,unless braces indicate otherwise.

Question 40

During the 1960s,it became clear that the indiscriminate use of transfers of control was the root of much difficulty experienced by software development groups.

Question 41

Counter-controlled repetition is also known as:

A) definite repetition
B) indefinite repetition
C) multiple-repetition structure
D) double-repetition structure

Question 42

It is known as when the number of repetitions is known before a loop begins executing.

A) definite repetition
B) infinite repetition
C) total repetition
D) None of the above.

Question 43

What is output by the following C# code segment
Int temp = 180;
While (temp != 80)
{
If (temp > 90)
{
Console.Write("This porridge is too hot! ");
// cool down
Temp = temp - (temp > 150
100 : 20);
}
Else
{
If (temp < 70)
{
Console.Write("This porridge is too cold! ");
// warm up
Temp = temp + (temp < 50
30 : 20);
}
}
}
If (temp == 80)
{
Console.WriteLine("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 44

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

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

Question 45

Variables that store totals should generally be initialized to zero before being used in a program.

Question 46

Repetition in which the number of iterations is unknown before the loop begins executing is called ________.

A) indefinite repetition
B) controlled repetition
C) top-down repetition
D) None of the above.

Question 47

A can be used in repetition structures to indicate the end of data entry.

A) counter
B) boolean
C) sentinel value
D) None of the above.

Question 48

Which of the following is not necessarily 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 key word (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 49

The while statement is an example of a sequence structure.

Question 50

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

A) signal value
B) break value
C) dummy value
D) flag value

Question 51

Floating-point numbers contain a fractional part and can be represented by the data type.

A) frac
B) real
C) double
D) None of the above.

Question 52

Which of the following is not one of the three phases that a program is typically split into using pseudocode

A) termination phase
B) initialization phase
C) processing phase
D) action phase

Question 53

A variable used only within a repetition statement should be declared within the statement.

Question 54

A while statement allows you to specify that an action should repeat while:

A) a specific condition remains false
B) a specific condition remains true
C) a specific condition remains either true or false
D) None of the above.

Question 55

A while statement can cause logic errors where the body never stops exe
Cuting.This is known as a(n)      

A) syntax error
B) fatal error
C) infinite loop
D) None of the above.

Question 56

Counter-controlled repetition is often called definite repetition because the number of repetitions is known before the loop begins executing.

Question 57

int division may yield a non-int result.

Question 58

Which of the following conditions would cause a while statement to stop executing

A) 3 < = 11
B) !(7 != 14)
C) 6 != 9
D) All of the above.

Question 59

A can be used in a repetition structure to control the number of times a set of statements will execute.

A) declaration
B) counter
C) controller
D) None of the above.

Question 60

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 61

The cast operator is formed by enclosing a type name in braces.

Question 62

C# rounds fractional values when they're to be stored in an integer variable.

Question 63

Cast operators are used to perform implicit conversions between data types.

Question 64

When using top-down,stepwise refinement,only the last refinement is a com
plete specification of the algorithm.

Question 65

A flag value should not be a legitimate data entry value.

Question 66

Which of the following operators associates from left to right

A) ++
B)
C) %=
D) /

Question 67

Which of the following generates a syntax error

A) c *= 3;
B) c %= 2;
C) c /= 4;
D) None of the above.

Question 68

Many algorithms can be divided into an initialization phase,a processing phase and a termination phase.

Question 69

The sentinel value must be chosen so that it cannot be confused with an acceptable in
put value.

Question 70

Which of the following correctly represents the expression a = a + 3

A) 3a
B) a += 3
C) a + 3
D) None of the above.

Question 71

Which statement is true

A) A while statement cannot be nested inside another while statement.
B) An if statement cannot be nested inside another if statement.
C) A while statement cannot be nested inside an if statement.
D) None of the above.

Question 72

When you know how many times a loop will execute in advance,a ________loop should be used.

A) sentinel
B) infinite
C) counter-controlled
D) None of the above.

Question 73

Top-down,stepwise refinement helps lead to well-structured algorithms.

Question 74

Which of the following segments will call the method readData four times

A) int k; k = 1;
While (k < 4)
{
ReadData();
K = k + 1;
}
B) int i;
C) int i;
D) int i; i = 0;
While (i < 4)
{
ReadData();
I = i + 1;
}

Question 75

What is typically the most difficult part of solving a problem on a computer

A) deciding what problem needs to be solved
B) developing the algorithm for the solution
C) producing a C# program from the algorithm
D) None of the above.

Question 76

Local variables must be ________.

A) initialized when they are 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.

Question 77

Which statement is false

A) To ensure that the operands are of the same type, C# 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 than the multiplicative operators.
D) Cast operators are formed by placing parentheses around the name of a type.

Question 78

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 79

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 80

Using top-down,stepwise refinement results in pseudocode that can be straightforwardly evolved into a C# program.