Unit 4

Question 1

4.1 - If-Else Branches (General)

What is a branch?

Answer 1

a sequence of statements only executed under a certain condition

Question 2

4.1 - If-Else Branches (General)

What does an if/else statement do?

Answer 2

if a statement is true, perform x command
else / otherwise, perform y command

Question 3

4.2 - Detecting Equal Values with Branches

How do you check if two values are and are not equal?

using x and y, code format

use x = y

Answer 3

if x == y
if x != y

Question 4

4.2 - Detecting Equal Values with Branches

What does elif do?

Answer 4

acts as a secondary if statement with less imporance

Question 5

4.2 - Detecting Equal Values with Branches

What is Boolean Logic?

or just a Boolean value

Answer 5

a binary system of representing information (true/false system)

Question 6

4.3 - Detecting Ranges with Branches (General)

How do you check if a value is within a range?

x between y and z, in code format

Answer 6

if y < x < z or
if y > x and x < z

Question 7

4.4 - Detecting Ranges with Branches

What are relational operators?

definition & symbols

Answer 7

operators used for comparing values
< > <= >= = and ==

Question 8

4.4 - Detecting Ranges with Branches

What is operator chaining?

just give an example, x y and z

Answer 8

x < y < z

Question 9

4.5 - Detecting Ranges Using Logical Operators

What is a logical operator?

Answer 9

an operator which conforms to Boolean logic

Question 10

4.5 - Detecting Ranges Using Logical Operators

What are the three logical operators?

Answer 10

and true if both operands are true
or true if either operand is true
not true if opposite opperand is false

Question 11

4.6 - Detecting Ranges with Gaps

What is a fall-through?

Answer 11

a programming problem where improper ranges lead to values “falling through” gaps

x < 10
x > 10
but what if x == 10?

Question 12

4.7 - Detecting Multipe Features with Branches

What is a nested if/else statement?

Answer 12

an if/else statement within another if/else statement

Question 13

4.8 - Comparing Data Types and Common Errors

Why should you avoid using equality operators with floating-point numbers?

Answer 13

equality operators might inaccurately represent the floats

Question 14

4.9 - Membership and Identity Operators

What are the two membership operators and what do they do?

Answer 14

in and not in
determines if left operand is featured in right operand (container)

Question 15

4.9 - Membership and Identity Operators

What are the two identity operators and what do they do?

Answer 15

is and is not
checks if two operands are bound to the same object

Question 16

4.10 - Order of Evaluation

What is the order of evaluation/precedence rules?

Answer 16

1. parenthesis
2. arithmetic operators
3. relational operators and membership operators
4. not
5. and
6. or

2 → * / % + -
3 → < <= > >= == != and in not in
4-6 → logical operators

Question 17

4.11 - Code Blocks and Indentation

How many spaces equal one tab?

Answer 17

4 spaces → 1 tab

Question 18

4.12 - Conditional Expressions

What is a ternary operation?

Answer 18

a three-part operation
x if y else z

if y is true, then x… otherwise z

it’s better to avoid these