Elmo HARmonica Limitations, Expressions And Operators Numbers, General rules for operators

HARSFEN0602ElmoHARmonicaSoftwareManual PRELIMINARYDRAFT

A user program may contain too long line and its representation at the screen may be not convenient, because not all symbols shown at the screen. In order to improve readability of the program, a user may continue this expression at the next line. Three points at the end of line indicates that this line will be continued.

Example:

Assume that user program contains the next expression c = 12 * + sqrt(2) – sin(3.14 / 2) + 7 ^ 3 * …

(6 + b) * 34

Three points at the end of the first line shows that this expression is not finished and is continued at the next line.

30

5.2.3Limitations

Every line of a user program text may contain 128 characters as maximal length (for better readability at the screen). For too long text line (more than 128 symbols) the Compiler sets an error.

Expressions also have limitation: the maximal admissible length of expression is 512 symbols, not including comments. If a program contains complex expression that takes some lines and the summary length of expression without comments and three points exceeds 512 symbols, then the Compiler sets an error.

There are some limitations of a user program text depending on the specified Harmonica device. The list of setup parameters of the Harmonica, which are limiting a user program, is represented below.

Maximal length of user program text

Maximal number of routines, including functions, labels and auto routines Maximal number of variables, including as global as local

Maximal length of the data segment – space for storage of global variables Maximal length of the code segment – space for compiled code

•Maximal depth of the stack – working space of the program

The IDE enables a user to see these parameters (not implemented yet). Ask Ilia and Nicolay

5.3Expressions And Operators

5.3.1Numbers

The number syntax is the similar to the Interpreter Language (see Number of the Interpreter Language ), but there are some differences in evaluation of immediate numbers. User program is compiled at the PC in off- line mode, so it has more resources, than the Interpreter.

The range for floating point numbers is [-1e38,+1e38], it is more than the Interpreter language numbers have.

If an integer number overflows integer range, it is converted to float (the Interpreter interprets it as an error). If a floating-point number overflows floating-point range, it is interpreted as an error.

5.3.2Mathematical and Logical Operators

The description and syntax is the same as in the Interpreter Language. See Operators of the Interpreter Language

5.3.3General rules for operators

The description and syntax is the same as in the Interpreter Language. See General rules of the Interpreter Language