The **`num.zero?` function** returns `true` if the number is zero, and `false` otherwise. 

# Syntax
```ruby
num.zero?
# where num is the number which is to be checked for zero
```
# Parameter
This function does not require a parameter.

# Return value
This function returns `true` if the number is zero. Otherwise, it returns `false`.

# Code

#zero number
print "(0).zero? : ",(0).zero? , "\n"

print "(0.0).zero? : ",(0.0).zero? , "\n"

#non-zero number
print "(4).zero? : ", (4).zero?, "\n"

print "(4.5).zero? : ", (4.5).zero?, "\n"

What is num.zero? in Ruby?

The `num.zero?` function in Ruby returns true if the number is zero and false otherwise.