The turbo

Part 2 Chapter 9 Predefined Data Types
Now 0 has been properly defined as an integer variable, the same
as the others used. But why did you decide to make them all of
type I nteger? And just what does that mean, anyway? Let's look at
the four basic data types of Pascal so see if you can get an answer.
9.2 INTEGER
You know what integers are: they're counting numbers (0, 1, 2,
3, ... ) with negative numbers (-1, -2, -3, ... ) thrown in. The largest
integer you can work with depends upon the amount of space
used for integer variables. TURBO Pascal allocates two bytes,
giving a maximum positive value of 32767 (known as Maxlnt).
The maximum negative value is -(Maxlnt+1). So, TURBO Pascal
allows the following range of values for integers:
-38768 -38767 -38766 ... 0 ... 38768 38766 38767
Remember your discussion of constants and expressions? An
integer constant is simply a string of digits (no commas, please)
with an optional - (minus sign) in front. An integer expression
(formula) contains integer constants and/or integer variables
and/or integer operators. The result of an integer expression is
some integer value. Your sample program has two such
expressions:
a + b add the values of a and b
a - b subtract the value of b from that of a
You usually find expressions on the right side of assignment
statements (as in your sample program). The program evaluates
the expression using the current contents of any variables
involved and then stores the resulting value in the variable on the
left side of the :=. The integer operators that can appear in an
expression are:
= addition
subtraction (and unary minus)
* multiplication
div division
mod remainder
9-3