An interpreter for the CIT-U First Programming Language written in Java.

CFPL is a very simple programming language that allows the programmer to achieve fluency in minutes. It is a strongly typed programming language.

From the sample program written below:

* my first program in CFPL
VAR abc, b, c AS INT
VAR x, w_23=’w’ AS CHAR
VAR t=”TRUE” AS BOOL
START
  abc=b=10
  w_23=’a’
  * this is a comment
  OUTPUT: abc & “hi” & b & “#” & w_23 & “[#]”
STOP

The console should show:

10hi10
a#

Program Structure:

• every line contains a single statement
• all variable declaration is found on top of the program
• a line that starts with asterisk(*) is considered as a comment and comment can be found in any part of the program
• executable code should be found inside the START and STOP block
• all reserved words are in capital letters
• sharp 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 uses 32 bits. It can be positive or negative.
2. CHAR – a single symbol. It uses UNICODE.
3. BOOL – represents the literals true or false.
4. FLOAT – a number with decimal part. It uses 64 bits.

Operators: Arithmetic operators

1. ( ) - parenthesis
2. *, /, % - multiplication, division, modulo
3. +, - - addition, subtraction
4. >, < - greater than, lesser than
5. >=, <= - greater than or equal to, lesser than or equal to
6. ==, <> - equal, not equal

Logical operators ()

1. AND - needs the two BOOL expression to be true to result to true, else false
2. OR - if one of the BOOL expressions evaluates to true, returns true, else false
3. NOT - the reverse value of the BOOL value

Unary operator

1. + - positive
2. - - negative