Deck 6: Control Statements: Part 2

Question 1

Which of the following is not a control statement in C#

A) do…while

Answer 1

B
Essentials of Counter-Controlled Repetition

Question 2

The for repetition statement handles the details of counter-controlled repeti
tion.

Answer 2

True

Question 3

Consider the following two C# code segments:
Segment 1 Segment 2
Int i = 0;
For (int i=0;i < = 20;++i)
While (i < 20) {
{ Console.WriteLine (i);
++i; }
Console.WriteLine (i);
}
Which of the following statements is true

A) The output from these segments is not the same.
B) The scope of the control variable i is different for the two segments.
C) Both (a) and (b) are true.
D) Neither (a) nor (b) is true.

Answer 3

C

Question 4

The first line of the for statement is sometimes called the:

A) for statement header
B) increment header
C) repetition header
D) None of the above.

Question 5

Which of the following for-loop control headers results in equivalent numbers of iterations:
1)for (int q = 1;q < = 100;++q)
2)for (int q = 100;q >= 0;--q)
3)for (int q = 99;q > 0;q -= 9)
4)for (int q = 990;q > 0;q -= 90)

A) 1) and 2)
B) 3) and 4)
C) 1) and 2) have equivalent iterations and 3 and 4 have equivalent iterations
D) None of the loops have equivalent iterations

Question 6

Modifying the control variable of a for statement in the body can cause errors.

Question 7

Which of the following for headers is syntactically incorrect

A) for (int i = 1; i < 10;)
B) for (; i == 3;)
C) for (i == 3)
D) None of the above.

Question 8

If a while condition is never true,the body will never execute.

Question 9

The header for (int i = 0;i < = 10;++i)will cause i to be incremented:

A) before the body begins execution
B) after the body begins to execute, but before it finishes
C) after the entire body executes
D) None of the above.

Question 10

Only one control variable may be initialized,incremented or decremented in a for statement header.

Question 11

A while statement automatically increments a variable that a programmer specifies.

Question 12

A common logic error known as a(n)occurs when the programmer incor
Rectly specifies a conditional operator,such as < instead of < =.

A) fatal error
B) off-by-one error
C) syntax error
D) None of the above.

Question 13

Counting loops should be controlled with whatever data type most closely reflects the operations taking place,whether that is an int,float or double.

Question 14

A variable used as a counter should be initialized when it's declared.

Question 15

Counting loops should be controlled with values.

A) double
B) int
C) char
D) None of the above.

Question 16

Counter-controlled repetition requires only a control variable,an initial value for the control variable and an increment or decrement.

Question 17

The initialization expression,condition and increment expression in a for statement's header must be separated with commas.

Question 18

A control variable that's declared in a for statement header is not accessible outside of the body of the for statement.

Question 19

for statements cannot be represented as while statements.

Question 20

Unary operators (such as ++)cannot be used in conditions.

Question 21

Which of the following statements is false

A) C# does not include an exponentiation operator.
B) The expression
Math.Pow(x, y)
Calculates the value of x raised to the yth power.
C) C# will implicitly convert a double to a decimal, or vice versa.
D) In loops, avoid calculations for which the result never changes-such calculations should typically be placed before the loop. Optimizing compilers will typically do this for you.

Question 22

Braces are normally included with do…while statements even when unnec
essary to avoid confusion with the while statement.

Question 23

The loop body of a do…while statement always executes __________.

A)zero times
B)at least once
C)more than once
D)undeterminable

Question 24

A default case must be provided for every switch statement.

Question 25

Some compilers will automatically remove from loops body statements that do not need to be executed multiple times through a process known as

A) classification
B) optimization
C) interpretation
D) None of the above.

Question 26

The C# operator ^ can be used for exponentiation.

Question 27

Which of the following is equivalent to this code segment
Segment: int total = 0;
For (int i = 0;i < = 20;i += 2)
{
Total += i;
}

A) int total = 0;
B) int total = 0;
C) int total = 0;
D) int total = 0;

Question 28

A case can be labeled as to execute in the event that none of the pro
Vided cases are equivalent to the controlling expression.

A) general
B) default
C) case *
D) None of the above.

Question 29

The do…while repetition statement tests the condition the body of the loop executes.

A) before
B) while
C) after
D) None of the above.

Question 30

What occurs when an empty case matches the controlling expression

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

Question 31

A loop that counts down from 10 to 1 using control variable counter should use the loop-continuation condition counter < = 1.

Question 32

It's possible to specify that a constant is of type decimal by appending the letter m to the constant.

Question 33

A case that consists of multiple lines must be enclosed in braces.

Question 34

The initialization and increment expressions in a for statement can be comma-separated lists that enable you to use ________.

A) multiple initialization expressions
B) multiple increment expressions
C) multiple initialization expressions and/or multiple increment expressions
D) neither multiple initialization expressions nor multiple increment expressions

Question 35

Many classes provide methods to perform common tasks that do not require specific objects-they must be called using a class name.Such methods are called ________ methods.

A) classwide
B) dot (.)
C) console
D) static

Question 36

Which of the following statements is false

A) When a decimal variable is initialized to an int value, the int value must be cast to decimal.
B) C# treats whole-number literals like 7 and 1000 as type int.
C) Unlike double values, int values can be assigned to decimal variables.
D) C# treats numeric literals like 0.05 as type double.

Question 37

Compressing statements before and in a for statement into the for header can reduce the readability of a program

Question 38

Infinite loops are caused when the loop-continuation condition in a while,for or do…while statement never becomes true.

Question 39

What is the Windows key sequence for typing the end-of-file indicator in Command Prompt window

A) < Alt > z
B) < Ctrl > z
C) < Windows >z
D) < Shift >z

Question 40

Which of the following will count down from 10 to 1 correctly

A) for (int j = 10; j < = 1; ++j)
B) for (int j = 1; j < = 10; ++j)
C) for (int j = 10; j > 1; --j)
D) for (int j = 10; j >= 1; --j)

Question 41

Only the statements for one case can be executed in any one execution of a switch statement.

Question 42

The continue statement is used to undo the effects of the break statement.

Question 43

A case with no statements is called an empty case,and requires only the break statement.

Question 44

The statement,when executed in a while loop,skips the remaining statements in the body of the statement and begins the next iteration of the loop.

A) continue
B) break
C) next
D) None of the above.

Question 45

The statement,when executed in a for loop,will terminate the loop.

A) continue
B) break
C) next
D) None of the above.

Question 46

The logical exclusive OR operator is true if it at least one of its operands is true.

Question 47

The break statement terminates a program.

Question 48

The second operand of an && operator will not be evaluated if the first operand evaluates to true.

Question 49

The effects of break and continue statements can be achieved by struc
tured programming techniques.

Question 50

The && operator has higher precedence than the || operator.

Question 51

Which is equivalent to if (!(grade == sentinelValue))

A) if (grade !== sentinelValue)
B)if (grade != sentinelValue)
C) if (grade == sentinelValue)
D) if (grade !== sentinelValue)

Question 52

Which of the following operators ensures that at least one out of multiple conditions is true

A) ||
B) &&
C) ==
D) ^

Question 53

Suppose variable gender is MALE and age equals 60,how is the expression
(gender == FEMALE)&& (age >= 65)
Evaluated

A) The condition (gender == FEMALE) is evaluated first and the evaluation stops immediately.
B) The condition (age >= 65) is evaluated first and the evaluation stops immediately.
C) Both conditions are evaluated, from left to right.
D) Both conditions are evaluated, from right to left.

Question 54

Which case of the following would warrant using the boolean logical inclusive OR (|)rather than the conditional OR (||)

A) Testing if two conditions are both true.
B) Testing if at least one of two conditions is true.
C) Testing if at least one of two conditions is true when the right operand has a required side effect.
D) Testing if at least one of two conditions is true when the left operand has a required side effect.

Question 55

Which of the following statements about the break statement is false

A) The break statement is used to exit a repetition statement early and continue execution after the loop.
B) A break statement can only break out of an immediately enclosing while, for, do…while or switch statement.
C) The break statement, when executed in a while, for or do…while, skips the remaining statements in the loop body and proceeds with the next iteration of the loop.
D) Common uses of the break statement are to escape early from a loop or to skip the remainder of a switch.

Question 56

Assuming a is a bool with a value of false,which of the following eval
Uates to true

A) !(!a)
B) a
C) !a
D) None of the above.

Question 57

Short-circuit evaluation is a performance feature related to the evaluation of conditional AND and conditional OR expressions.

Question 58

Which of the following statements about the continue statement is true

A) The continue statement is used to exit a repetition statement early and continue execution after the loop.
B) The continue statement is used to continue after a switch statement.
C) The continue statement does not alter the flow of control.
D) A continue statement proceeds with the next iteration of the immediately enclosing while, for, do…while statement.

Question 59

Consider the code segment below.
If (gender == 1)
{
If (age >= 65)
{
++seniorFemales;
}
}
This segment is equivalent to which of the following

A) if (gender == 1 || age >= 65) {
B) if (gender == 1 && age >= 65)
C) if (gender == 1 AND age >= 65)
D) if (gender == 1 OR age >= 65)

Question 60

Which of the following statements is true

A) strings can be used in switch expressions, but string literals cannot be used in case labels.
B) strings cannot be used in switch expressions, but string literals can be used in case labels.
C) strings can be used in switch expressions, and string literals can be used in case labels.
D) strings cannot be used in switch expressions, and string literals cannot be used in case labels.

Question 61

In structured programming,the only two ways to combine control statements are stacking and nesting.

Question 62

The rule says that any rectangle (action)in an activity diagram can be replaced by two rectangles with round edges.

A) nesting
B) selection
C) stacking
D) None of the above.

Question 63

The while statement is sufficient to perform any type of repetition.

Question 64

The stacking and nesting rules must be applied in a specific order.

Question 65

Which statement below is false

A)Structured programming produces programs that are easier to test.
B)Structured programming requires four forms of control.
C)Structured programming produces programs that are easier to modify
D)Structured programming promotes simplicity.

Question 66

Control-statement stacking is the process of:

A) placing control statements within each other
B) placing control statements one after another
C) reducing the number of statements required by combining statements
D) None of the above.