'''
# Boolean variables

A Boolean variable can take two values: `True` or `False`. You can use it for 
applying logic in Python, which you will encounter later. As you saw in the 
last exercise, you can convert variables to another type. By converting a 
variable to a Boolean object, you can check the "truth value" that Python 
assigns to the variable. 

Check the truth value of the following variable values by using `bool()` and `print()`.
'''

a = 10
b = 3.4
c = 2 + 3j
d = 0

# Write your code here.