CodeHS 2.13 Short-Circuit Evaluation

Is a boolean true or false?

• true

• false

The operators ||, &&, and ! are what kind of operators?

• logical

• conditional

• boolean

• legal

What is short-circuit evaluation?

• When Java ignores the right argument of a logical operator because the left argument is enough to get results

• When Java ignores the left argument of a logical operator because the right argument is enough to get results

• When logical operators are used in sequence from left to right to make an algorithm shorter

• When logical operators are used in sequence from right to left to make an algorithm shorter

II short-circuits on a value of

• true

• false

&& short-circuits on a value of

• true

• false

What is printed to the screen?

• The meaning of life is

  other people

• The meaning of life is

  42

• The meaning of life is

• (Nothing: the program crashes when you try to divide by zero)

Match the following

• Equal to

• =

• Greater than

• >

• Less than or equal to
• <=
• Not equal to

• !=

• Greater than or equal to

• >=

What does short circuit evaluation mean in the following code?

i) if (a < b && c != d)

• if a < b is false it evaluates c != d

• if a < b is false it doesn't evaluate c != d

• if c != d is false it evaluates a < b

• f c != d is false it doesn't evaluate a < b

• if a < b is true it doesn't evaluate c != d

What is the significance of the "if-else" statement in block coding?

• It allows the code to choose between two paths based on a condition

• It repeats a block of code multiple times

• It defines a function

• It creates a variable

Which of the following is an example of a conditional statement?

• If it is raining, then bring an umbrella.

• Repeat 10 times.

• Add 5 to x.

• Print "Hello, World!"