if/else statements quiz

True or false: else statements and else if statements MUST follow an if statement

• True

• False

Answer explanation

"else" implies that the condition of the preceding if statement is false, therefore else and else if statements must follow an if statements

True or false: an if statement MUST be followed by an else statement

• True

• False

An if statement (i.e. if (condition) { ... }) will only execute if...

• The condition is true

• The condition is false

• It always executes

• It never executes

A statement of the form else if (condition) { ... } will only execute if...

• The condition in parentheses is true and the preceding if statement executes

• The condition in parentheses is true and the preceding if statement does NOT execute

• The condition in parentheses

Answer explanation

"else" implies that the condition of the preceding if statement must be false; the condition in parentheses following "if" must be true in order for the statement to execute

An else statement (of the form else { ... } will only execute if...

• All preceding if and else if statements do NOT execute

• All preceding if and if else statements execute

• It always executes

• It never executes

Answer explanation

"else" implies that all the conditions of the preceding if and else if statements are false, meaning that they do not execute

Can a nested if statement execute if the outer conditional statement is false?

• Yes

• No

Answer explanation

A nested if statement is inside another conditional statement. If the outer conditional does not have its condition fulfilled, then the code inside of it can never execute.

Which of the following conditional statements is executed?

• The if statement

  if (z == 3) { ... }

• The else if statement

  else if (z < 5) { ... }

• The else statement

  else { ... }

• None of them

Answer explanation

Let's look at each of the conditionals:

if (z == 3) { ... } cannot be executed because z is not equal to 3

else if (z < 5) { ... } cannot be executed because z is not less than 5

Therefore, the else statement at the bottom must be executed since all the previous conditionals do not execute

Follow up: what is the output of this code?

• a

• b

• c

What will be the value of after this set of conditional statements?

• 7

• 9

• 10

• 4

What will be the output of this code? (hint: the == operator can be used on strings to see if they have the same value, meaning the same exact sequence of characters)

• same name

• different names