Testing ground for flex + bison grammar parsing.

The program calc expects the file to parse as argument; pass - to read the standard input.

You may pass -p to activate the parser debug traces, and -s to activate the scanner's.

Current behavior

The only data type allowed is real numbers. No strings, characters, pointers, etc.
No conditional logic or jumping exists.
The following operations are allowed in an expression (in ascending precedence):
- A + B or A - B
- A * B or A / B or A \ B (integer division) or A % B (remainder)
- - A (negate)
- ( A )
Anything within double quotes is text to print to stdout. Supported escape codes are \" and \n.
Any expression preceded by an @ symbol will be printed to stdout.
By default, a newline is appended to every print. append a ; to suppress this.
Input a variable

Example input file:

"value in: ";
? value
value := (value + 3) * 4 / 3
"new value: ";
@ value