gforth-tutorial/02-arithmetics.fth

2 2 .s
+ .s
.
2 1 - .
7 3 mod .
3 4 + 5 * .
6 7 - 8 * 9 + .
2 negate .
3 negate negate 4 * 5 - .
7 3 /mod . .  \ does 2 things -> puts 2 results on the stack! -> multiple return values are simple!