Branching Part 2

Question 1

Logical AND (2)

How to get to true and how to get to false

Answer 1

• ALl expression must evaluate to true before the entire expression is true
• If any expression is false then whole expression evaluates to false

Question 2

Logical OR (2)

How to get to true and how to get to false

Answer 2

• If any Boolean expresion evaluates to true then the entire expression evaluates to true
• All Boolean expressions must evaluate to false before the entire expression is false

Question 3

Logical NOT

may be expression by

Answer 3

• May be replaced by the use of an inequality operator

Question 4

Nested Branches (3)

How it works+ex for type+ex content

Answer 4

• An IF-branch that is inside of another IF-branch
• Only when users specifies the residence as ALberta does the program ask for which city
• The nested branch is only checked if the first branch’s Boolean expression evaluates to true

Question 5

Nested Desicion Making (2)

The format and how to get inner desicion to be executed?

Answer 5

• One desicion is made inside another
• Outer desicions must evaluate to true before inner desicions are even considered for evaluation

Question 6

Why should you not use editor with diff font sizes?

Answer 6

Extra info will introduce syntax errors

Question 7

Desicion Making with multiple IFS (2)
Later questions+ employed when…

Answer 7

• Later questions (IF) always asked regardless of previous questions.
• Employed when a series of independent questions will be asked

Question 8

When to use multiple “Ifs”? (3)

The condition+ question and ans relationship+Boolean expression

Answer 8

-non-exclusive conditions (multiple conditions or options can be true/ not excclusive)
The questions are independent and the ans does not affect the next question
- More than one Boolean expressions for each if can be true

Question 9

Why to not use multiple IFs (3)

Answer 9

ineffiecient because later Boolean expressions may be evaluated needlessly
- specifying a sequence of independent conditions can be less optimal when at most only 1 condition can be true
- For ex use If-Elise-Else as if one of the earlier “if/elise” are true the trest arent evaluated.

Question 10

Multiple If-Elif-Else (2)

How it works/what if false?+Ex

Answer 10

• One condition evaluating to true excludes other conditions from being true (The ifs that come later are only evaluated if the earlier “ifs” evaluated to false)
• Example, having current location as calgary excludes the possibility of the current location as Edmonton, Toronto, Medicine Hat

Question 11

When is nesting needed?

Answer 11

When you have a dealbreaker. The outer Boolean expression (gatekeeper) must be true before the inner expression will be evaluated.

Question 12

When to use nested IF vs IF-AND?

Answer 12

When you want one consition to evaluate to true and do something even if second is False.

Question 13

We dont execute Boolean body of an IF unless

Answer 13

expression evaluates to true

Question 14

IF-Else

Answer 14

Checks conditions and executes one body of code if the condition is true and aother is the condition is false

Question 15

Descision making with multiple IFs, the later questions are

Non exclusive conditions

Answer 15

always asked regardless of previous questions

Question 16

Multiple IF-Elif-ELse are used with________ conditions

Answer 16

mutually exclusive conditions

Question 17

Mutally exclusive

Answer 17

One condition evaluating to true excludes other conditions from being true

Question 18

When to use If- elif? + also allows what? (2)

Answer 18

• multiple Boolean expression need to be evaluated but at most only 1 Boolean expression can be evaluated to true
• Also allows for a seperate body (else) to execute when all the if-elif expressions are false

Question 19

When to use compound desicion making?

Answer 19

There may have to be more than 1 condition to be considered before the body can execute. All expression must evaluate to True (AND) or at least one must be true (OR)

Question 20

dealbreaker/ gatekeepers are in

Answer 20

Nested expressions

Question 21

Why do we avoid using a float when an integer will do?

Answer 21

floating points are approximations of real numbers and are not stored as exact values. If you use an operator (>=) it has ro be exact, close enought does not work.