Computer Programming with GNU Smalltalk - Free

Objects, Messages and Classes: Part I 27
A slash character is used for division. GNU Smalltalk will give us a number in fraction or decimal
representation whichever it decides is appropriate:
\\
50/4
25/2
0.5/5
0.1
Double backslash character is used for modulus operation:
2
0
5 \\ 3
3 \\ 3
between:and:
We can control whether a number is between other numbers or not by using between:and: selector.
For example, to control if 3 is between 1 and 5:
3 between: 1 and: 5
true
As you can see GST returned an object named true. This is an instance of Boolean class which is
used for determining the accuracy of a logical statement. Then, how is logical inaccuracy represented?
Let's look at the result of this code:
3 between: 4 and: 6
false
As you can see it is represented by an object named false. We will see how to use this Boolean
objects more detailed on Chapter 4, Controlling the Flow of Execution.
abs
We use abs message to get the absolute value of a negative number:
3
-3 abs