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HARSFEN0602
4.1 The command line
The Interpreter evaluates input strings, called “expressions”. An expression is a sequence of
characters, terminated by a semicolon ‘;’, a line feed, or a carriage return.
A command line may include the “Comment marker” – two consecutive asterisks. All the text from
the comment marker to the next line feed or carriage return is ignored.
The maximal expression length is 512 symbols.
The comment marker feature enables the preparation of documented batch files, to be later sent
directly to the amplifier.
Example:
a = 3 ; b = 2 ; c = a + b ** Ignore this text
This line consists of three expressions separated with semicolon. The comment “Ignore this text” is
ignored.
4.2 Expressions And Operators
The Amplifier language supports operators, which specify a mathematical, logical or
conditional operation/relation between two operands or more. Operands (actually
parameters) and operators may be combined in almost any way to create an expression. The
following paragraphs present the operators and the expression syntax rules.
4.2.1 Numbers
The Amplifier has two number types: 32 bit integers and 32 bit floating point numbers. As
text inputs, numbers that contain a decimal point or an exponent notation are interpreted as
floats. Other numbers are interpreted as integers.
The range for integers is [-2.1475e+009,+ 2.1475e+009].
Positive integers may be written as decimal or as hexadecimal.
The hexadecimal notation 0x10 is equivalent to the decimal number 16.
A 32-bit floating-point number has 24 significant mantissa bits and 8 bits of exponent.
The range for floating point numbers is [-1e20, 1e20].
A floating-point number may be written with or without an exponent.
2.5e4 is equivalent to 25000.0. It is not equivalent to 25000, since the latter number is
interpreted as integer.
If an integer number overflows integer range, it is interpreted as an error.
If a floating-point number overflows floating-point range, it is interpreted as an error.
Logical operators yield 0 or 1 as a result. The results of logical operators are integers.
4.2.2 Mathematical And Logical Operators
The following table lists the mathematical and logical operators of the language. The table
also specifies the operator precedence, which is discussed in the next paragraphs. The larger
number has the higher precedence.
Operator Description Precedence