Firth, or 1th, is a postfix calculator for fractions.
Firth is a stack based rpn calculator, created to be an improved version of Unix's dc. It supports basic arithmetic, a few forth primitives and is the perfect companion utility to Fractran.
Examples
The following example, will print the mixed fraction 3&1/6.
clr 11 4 div 5 12 div add mix
To print the decimal value of a fraction.
clr 22 7 div 1 791 div sub dec
To get the floor() of a fraction.
clr 17 4 div dup 1 mod sub .
1th.c
14V06— Firth Release