Language Specification of CODE Programming Language

Introduction

CODE is a strongly – typed programming language developed to teach Junior High School students basics of programming. It was developed by a group of students enrolled in the Programming Languages course. CODE is a pure interpreter.

Sample Program:

# this is a sample program in CODE

BEGIN CODE

INT x, y, z=5

CHAR a_1=’n’

BOOL t=”TRUE”

x=y=4

a_1=’c’

# this is a comment

DISPLAY: x & t & z & $ & a_1 & [#] & “last”

END CODE

Output of the sample program:

4TRUE5

n#last

Language Grammar Program Structure:

• all codes are placed inside BEGIN CODE and END CODE
• all variable declaration is found after BEGIN CODE
• all variable names are case sensitive and starts with letter or an underscore (_) and followed by a letter, underscore or digits.
• every line contains a single statement
• comments starts with sharp sign(#) and it can be placed anywhere in the program
• executable codes are placed after variable declaration
• all reserved words are in capital letters and cannot be used as variable names
• dollar sign($) signifies next line or carriage return
• ampersand(&) serves as a concatenator
• the square braces([]) are as escape code Data Types:

1. INT – an ordinary number with no decimal part. It occupies 4 bytes in the memory.
2. CHAR – a single symbol.
3. BOOL – represents the literals true or false.
4. FLOAT – a number with decimal part. It occupies 4 bytes in the memory. Operators: Arithmetic operators ()

• parenthesis *, /, %
• multiplication, division, modulo +, -
• addition, subtraction

, <

• greater than, lesser than

=, <= - greater than or equal to, lesser than or equal to ==, <>

• equal, not equal Logical operators () AND
• needs the two BOOL expression to be true to result to true, else false OR
• if one of the BOOL expressions evaluates to true, returns true, else false NOT
• the reverse value of the BOOL value Unary operator

• positive
• negative