Deck 4: Selection

Question 1

The term "flow of control" refers to the order in which a program's statements are executed.

Answer 1

True

Question 2

A relational expression consists of a boolean operator that compares two operands.

Answer 2

False

Question 3

In C, relational expressions are evaluated to yield a boolean result.

Answer 3

False

Question 4

In C, character data cannot be compared using relational operators.

Question 5

The && operator has a right-to-left associativity.

Question 6

The evaluation feature for the && and || operators that makes the evaluation of an expression stop as soon as it is definitively determined that an expression is true or false is known as short-circuit evaluation.

Question 7

The ! operator is an unary operator.

Question 8

The expression:
(6 * 3 == 36 / 2) && (13 < 3 * 3 + 4) || !(6 - 2 < 5)
evaluates to 1.

Question 9

The simplest C selection statement is the one-way if statement.

Question 10

The use of braces to enclose a set of individual statements creates a single block of statements, which may be used anywhere in a C program in place of a single statement.

Question 11

In C any expression can be tested within a selection statement, be it a relational, arithmetic, or assignment expression, or even a function call.

Question 12

Within a selection statement, an expression that evaluates to 0 or less is considered as false, while any positive is considered as true.

Question 13

A common practice for some programmers is to place the opening brace of a compound statement on the same line as the if and else statements.

Question 14

The following statement prints "You lose!" on the screen;
int num = -1;
if (num)
printf("Bingo!");
else
printf("You lose!");

Question 15

If you inadvertently use an assignment symbol, =, in place of the relational symbol, == in a relational expression, the compiler will flag this with either a warning or error message.

Question 16

Generally, the most useful nested if statement occurs when a second if-else statement is placed within the else part of an if-else statement.

Question 17

A nested if construction in which each nested if is written in the same line as the previous else is called an if-else chain, and is used extensively in many programming problems.

Question 18

Indentation used within an if-else is critical to ensure that the code compiles correctly.

Question 19

The compiler will, by default, associate an else with the closest previous unpaired if, unless braces are used to alter this default pairing.

Question 20

One of the main advantages of using a switch statement is that it avoids using the equality operator, ==.

Question 21

One of the main disadvantages of using a switch statement is that it requires the use of braces for compound internal statements.

Question 22

The switch statement usually results in more complex code than an equivalent if-else chain.

Question 23

Any number of case labels may be contained within a switch statement, in any order.

Question 24

In a switch statement, if the break statements are omitted, all cases following the matching case value, including the default case, are executed.

Question 25

When an executing program encounters a(n) ____ statement, the condition is evaluated to determine its numerical value, which is then interpreted as either true or false.

A)switch
B)break
C)if
D)else

Question 26

Relational expressions are also known as ____.

A)conditions
B)boolean expressions
C)logical expressions
D)if-else expressions

Question 27

The logical AND operator is ____.

A)||
B)&&
C)!
D)%%

Question 28

The logical NOT operator is ____.

A)||
B)&&
C)!
D)%%

Question 29

When the ____ operator is used with two expressions, the condition is true only if both expressions are true by themselves.

A)||
B)&&
C)!
D)%%

Question 30

When the ____ operator is used with two expressions, the resulting condition is true if either one or both of the two expressions are true.

A)||
B)&&
C)!
D)%%

Question 31

The ____ operator is used to change an expression to its opposite state.

A)||
B)&&
C)!
D)%%

Question 32

Which of the following operators has right to left associativity?

A)!
B)*
C)&&
D)||

Question 33

A ____ statement is one or more statements contained between braces.

A)conditional
B)nested
C)flow
D)compound

Question 34

What will the following program print on screen?
Int age = 0;
If (age = 40)
Printf("Happy Birthday!");
Else
Printf("Sorry");

A)Happy Birthday!
B)Sorry
C)Runtime error.
D)Nothing; the program will not compile.

Question 35

What will the following program print on screen?
Int age = 40;
If (age = 40)
Printf("Happy Birthday!");
Else
Printf("Sorry");

A)Happy Birthday!
B)Sorry
C)Runtime error.
D)Nothing; the program will not compile.

Question 36

What will the following program print on screen?
Int tenure = -5;
If (tenure + 5)
Printf("Congratulations!");
Else
Printf("Sorry");

A)Congratulations!
B)Sorry
C)Runtime error.
D)Nothing; the program will not compile.

Question 37

What will the following program print on screen?
Int tenure = -10;
If (tenure + 5)
Printf("Congratulations!");
Else
Printf("Sorry");

A)Congratulations!
B)Sorry
C)Runtime error.
D)Nothing; the program will not compile.

Question 38

The use of ____ in a C program will result in a compiler error.

A)if (age == 40)
B)if (40 == age)
C)if (age = 40)
D)if (40 = age)

Question 39

Including one or more if-else statements within an if or if-else statement is referred to as a ____ if statement.

A)compound
B)nested
C)multiway
D)short-circuit

Question 40

A ____ statement is a specialized selection statement that can be used in place of an if-else chain where exact equality to one or more integer constants is required.

A)case
B)break
C)switch
D)nested if

Question 41

In a switch statement, the word ____ is optional and operates the same as the last else in an if-else chain.

A)if
B)break
C)case
D)default

Question 42

It is a good practice to terminate the last case in a switch statement with a ____.

A)switch
B)break
C)default
D)case

Question 43

One aspect of ____ programming is to check for improper data before an attempt is made to process it further.

A)defensive
B)extreme
C)robust
D)user-friendly

Question 44

____ is not a relational operator.

A) ==
B) >
C) !=
D) ||