Week 3

Question 1

Data type for logical high and low data values (i.e., true or false)?

Answer 1

Bool

Question 2

Value 0 evaluates as which Boolean value?

Answer 2

False

Question 3

Value of anything other than zero evaluates as which Boolean value?

Answer 3

True

Question 4

Order in which statements are executed in a program is referred to as?

Answer 4

The flow of control

Question 5

The ordinary flow of control is?

Answer 5

Sequential

Question 6

A statement used to alter the ordinarily sequential flow of control?

Answer 6

Control structure

Question 7

An expression used by a control structure to determine the flow of control?

Answer 7

Branching condition

Question 8

Control structure used to change flow of control between different alternatives?

Answer 8

Selection or branching

Question 9

A statement of data values compored using logical operators is known as?

Answer 9

Logical expression, or assertion

Question 10

Characteristics of the bool data type?

Answer 10

It holds only true or false, which are constants, and reserved words

Question 11

Operators used to compare values in relational expressions are known as?

Answer 11

Relational operators

Question 12

Relational operator == checks for?

Answer 12

Equality between to values

Question 13

Relational operator != checks for?

Answer 13

Inequality between two values

Question 14

Relational operator > checks for?

Answer 14

Greater than relationship

Question 15

Relational operator < checks for?

Answer 15

Less than relationship

Question 16

Relational operator => checks for?

Answer 16

Greater than or equal to

Question 17

Relational operator =< checks for?

Answer 17

Less than or equal to

Question 18

Chars are logically compared in what way?

Answer 18

Alphabetically, according to ASCII

Question 19

Mixed type relational expressions are not always safe because?

Answer 19

Of implicit type coercion by the compiler

Question 20

Bools compared with numerical data types evaluate as?

Answer 20

0 and 1

Question 21

When comparing strings, one of them must be?

Answer 21

An identified string object as opposed to a literal C string

Question 22

When comparing nonidentical strings, which string is considered less than the other?

Answer 22

The string where the first nonidentical character in both strings comes earlier in the ASCII table, or whichever is smaller if they match to the end of one of the strings

Question 23

The fundamental control structure in C++ is?

Answer 23

The if statement

Question 24

If statements evaluate a relational expression how?

Answer 24

If true else if false

Question 25

What common algorithm uses if else statements?

Answer 25

Input validatiob

Question 26

If a branching condition contains no relational operators, what is the behaviour?

Answer 26

Evaluates true if result not zero or null

Question 27

If an if block contains another if block, how’s this referred?

Answer 27

Nested if

Question 28

Nested ifs can be formatted…?

Answer 28

if else if else if … else

Question 29

Logical operator && refers to?

Answer 29

AND operation

Question 30

Logical operator || refers to?

Answer 30

OR operation

Question 31

Logical operator ! refers to?

Answer 31

NOT operation, or inverse

Question 32

If statements should only lead into else if clauses if?

Answer 32

The conditions are interdependent, or mutually exclusive

Question 33

The final else is in an if else statement is called?

Answer 33

Dangling else

Question 34

The dangling else is connected to which statement?

Answer 34

The most recent if statement that doesn’t have a connected else statement

Question 35

What kind of evaluation methodology does C++ use for logical expressions?

Answer 35

Short-circuit evaluation

Question 36

What is short circuit evaluation?

Answer 36

Evaluation in left to right order, which short circuits as soon as the compiler calculates the Boolean value for the entire expression

Question 37

Which mathematical operation equates to the AND operator in Boolean algebra?

Answer 37

Multiplication

Question 38

Which mathematical operation equates to the OR operation in Boolean algebra?

Answer 38

Addition

Question 39

Which mathematical operation relates to the NOT operation in Boolean algebra?

Answer 39

Unary subtraction

Question 40

Where do relational operators, the assignment operator and logical operators come in the order of precedence?

Answer 40

1. Unary, *, %, / 2. > < => =< 3. == != 4. && 5. || 6. ! 7. =

Question 41

Why is it not appropriate to check equality between floating point numbers?

Answer 41

Because tiny inaccuracies (due to the calculation and storage methods of real numbers) mean that rarely are two floating point numbers the same

Question 42

How is it better to check for float equivalence?

Answer 42

std::fabs(a-b) > 0.00001 Where fabs (floating point absolute value) function returns difference