A short tutorial - Part 2: Variables and Types

Like in most other languages - variable names may contain letters, digits and underscores. Lower case letters are usual but upper case letters are allowed:

my_value = 18
MyTemperature = 36.8
text_21 = "Hirn"

Variables have types, even if you do never declare them. my_value in the upper example is of type Integer, because an integer value is assigned to it. The following would be an error:

my_value = 18    # my_value is now int
my_value = 18.5  # ERROR -> my_value cannot be float at the same time!

The following datatypes are builtin into Wirbel:

There is no automatic type conversion in Wirbel. But many operators and functions do automatically behave correctly with mixed types. Take the following example. The variable a will always be of type Integer:

a = 11
a += 2.3  # a is now 13
a *= 2.2  # a is now 28
print(a)

But the following would be an error:

a = 11
a = a + 2.3  # int + float gives float. Error!

Why? Because integer + float gives float. So a + 2.3 is an expression with type float. And that cannot be assigned to an integer variable. In such a case you have to explicitely convert the result to integer:

a = 11
a = int(a + 2.3)