L03: Selection

Question 1

What are the 3 conditional statements?

Answer 1

If, if-else, switch

Question 2

What happens if we try to compare chars for a conditional?

Answer 2

Converts to int based on Unicode character and compares.

Question 3

What can we use to compare 2 strings?

Answer 3

.equals() method

Question 4

How does the compareTo() method work?

Answer 4

Compares the combined ascii value of one string to another string. If string 1 is greater than string 2, returns +. If String 1 is less than string 2, returns -. If they are equal, returns 0;

Question 5

When should & and | be used

Answer 5

To avoid lazy evaluation.

Question 6

How are else statements evaluated regardless of indentation?

Answer 6

The else is matched with the first unmatched if unless {} are used.

Question 7

The switch case has two reserved words, what are they and explain what they do?

Answer 7

break: when a case is matched, executes expression and exits switch.

default: The default case if there are no matching cases.

Question 8

Can a switch be replaced by if-else?

Answer 8

Yes

Question 9

What happens if you don’t but a break in the switch?

Answer 9

The case that matches will execute the statement and flow down until a break is reached.

Question 10

What’s another way of writing a conditional? (shorthand)

Answer 10

condition? statement1: statement2 .
If condition true -> statement1
else -> statement2

NOTE that the value can be stored in a variable or even be used in a print.