Run make facile, and then ./bin/facile with the input file and output file as the next two arguments.

FACILE LANGUAGE:

LET var int | Change the value of variable var to the integer int
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PRINT var | Print the value of variable var to output
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PRINTALL | Prints the value of all used variables to output, one per line.
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ADD var p | Adds p to the value of the variable var, where p is an int or variable.
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SUB var p | Subtracts p from the value of the variable var, where p is an int or variable.
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MULT var p | Multiplies the value of the variable var by the integer or variable p
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DIV var p | Divides the value of the variable var by the integer or variable p
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GOTO linenum | Jumps execution of the program to the line numbered linenum
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IF var op | Compares the value of the variable var to the integer int
int THEN | via the operator op (<, <=, >, >=, =, <>), and jumps
linenum | execution of the program to line linenum if true.
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GOSUB linenum | Temporarily jumps to line linenum, and jumps back after a RETURN.
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RETURN | Jumps execution of the program back to the most recently executed GOSUB.
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END | Immediately terminates the program.
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. | Placed at the end of the program, and behaves like an END statement.