Instructions

172Compiler

Identifier

Identifier are the names of Functions or Variables.

Valid characters are letters (A-Z,a-z), numbers (0-9) and the low dash ('_')

An identifier always starts with a letter

Upper and lower case writings are differentiated

Reserved Words are not allowed as identifier

The length of identifiers is unlimited

Arithmetic Expressions

An arithmetic expression is a quantity of values connected by Operators. In this case quantities can

either be Figures, Variables and Functions.

A simple example:

2 + 3

Here the numerical values 2 and 3 are connected by the Operator "+". An arithmetic value again rep-

resents a value. In this case the value is 5.

Further examples:

a - 3

b + f(5)

2 + 3 * 6

Following the rule "Dot before Line" here 3 times 6 is calculated first and then 2 is added. This prior-

ity is in case of operators called precedence. A list of priorities can be found in the Precedence

Table.

Comparisons too are arithmetic expressions. The comparison operators return a truth value of

"1" or "0", depening on whether the comparison was true or not. The expression "3 < 5" yields the

value "1" (true).

Constant Expressions

An expression or portions of an expression can be constant. Portions of an expression can already

be calculated during Compiler runtime.

So e. g. the expression

12 + 123 - 15

is combined by the Compiler to

120.