Boolean Operators Practice

Question 1

Will cast_firebolt run?

when green flag clicked
set [level v] to (4)
set [power v] to (55)
if <<(power) > (50)> and <(level) > (3)>> then
cast_firebolt
end

Answer: Yes. power > 50 is true (55 > 50) and level > 3 is true (4 > 3). Both sides are true, so and is true.

Question 2

Will cast_firebolt run?

when green flag clicked
set [level v] to (2)
set [power v] to (55)
if <<(power) > (50)> and <(level) > (3)>> then
cast_firebolt
end

Answer: No. power > 50 is true (55 > 50), but level > 3 is false (2 > 3). With and, both sides must be true.

Question 3

Will play_sound run?

when green flag clicked
set [health v] to (0)
set [lives v] to (3)
if <<(health) = (0)> or <(lives) = (0)>> then
play_sound
end

Answer: Yes. health = 0 is true. With or, only one side needs to be true.

Question 4

Will play_sound run?

when green flag clicked
set [health v] to (50)
set [lives v] to (3)
if <<(health) = (0)> or <(lives) = (0)>> then
play_sound
end

Answer: No. health = 0 is false (50 ≠ 0) and lives = 0 is false (3 ≠ 0). With or, at least one side must be true.

Question 5

Will the sprite hide?

when green flag clicked
set [visible v] to (1)
if <not <(visible) = (0)>> then
hide
end

Answer: Yes. visible = 0 is false (1 ≠ 0). not flips it to true, so the sprite hides.

Question 6

Will the sprite hide?

when green flag clicked
set [visible v] to (0)
if <not <(visible) = (0)>> then
hide
end

Answer: No. visible = 0 is true (0 = 0). not flips it to false.

Question 7

Will game_over run?

when green flag clicked
set [score v] to (100)
set [time v] to (0)
if <<(score) > (50)> and <not <(time) = (0)>>> then
game_over
end

Answer: No. score > 50 is true (100 > 50). time = 0 is true, so not flips it to false. true and false is false.

Question 8

Will the sprite say “You win!”?

when green flag clicked
set [coins v] to (10)
set [keys v] to (0)
if <<(coins) > (9)> or <(keys) > (2)>> then
say [You win!]
end

Answer: Yes. coins > 9 is true (10 > 9). With or, only one side needs to be true, so it doesn’t matter that keys > 2 is false.

Question 9

Will reset run?

when green flag clicked
set [speed v] to (10)
set [fuel v] to (0)
if <<(speed) > (5)> and <<(fuel) > (0)> or <(fuel) = (0)>>> then
reset
end

Answer: Yes. speed > 5 is true (10 > 5). Inside the inner or: fuel > 0 is false but fuel = 0 is true, so the or is true. true and true is true.

Question 10

Will the sprite change color?

when green flag clicked
set [level v] to (5)
if <not <<(level) > (10)> or <(level) < (1)>>> then
change [color v] effect by (25)
end

Answer: Yes. level > 10 is false (5 > 10) and level < 1 is false (5 < 1). false or false is false. not false is true.