Booleans and IFs

Question 1

What are the different types of control structures?

Answer 1

Sequences, Choice, and Repetition

Question 2

What is a boolean

Answer 2

Used for true/false values

Question 3

What is a boolean expression?

Answer 3

A boolean variable, or an expression that gives a boolean result

Question 4

What are the built-in boolean values that respond to user input?

Answer 4

mousePressed and keyPressed

Question 5

How can you invert booleans?

Answer 5

With an exclamation point

Question 6

What are relational operators?

Answer 6

==, <, <=, !=, >, >=

Question 7

What are boolean operators?

Answer 7

&&, ||, !

Question 8

What is the order of operations now?

Answer 8

• expressions in parentheses
• Unary operators: +, -, ++, –, !
• Multiplicative: * / %
• Additive: +, -
• Relational: >, <, >=, <=
• Equality: ==, !=
• Logical and: &&
• Logical or: ||
• Assignment: =, +=, -=, *=, /=, %=

Question 9

What is short-circuiting?

Answer 9

If a condition is met, no further conditions will be tested in the if-else-if chain, or a test will be stopped as soon as the answer is known

Question 10

Why is it sometimes difficult to tell if two floating-point numbers are equal?

Answer 10

Because they are approximations. Errors accumulate as you do operations, so it is better to use >= and\or <= instead