The result of an arithmetic operation is an integer if all of the values in the operation are integers. If any value is a floating point number, the result is a floating point number. For example:

x = 3
y = 13.0
z = 7
result = x * y - z
print result

In this example, y holds a floating point number, since a value containing a decimal point has been assigned to it. This means that the result of x * y - z is a floating point number. When result is printed, 32.0 is displayed, not 32.