1 1+ 1-
1 ( --- 1)
Predefined constant. Stacks the value 1
1+ ( n --- n+1)
Increments the value at the top of the stack.
1- ( n --- n-1)
Decrements the value at the top of the stack.
Predefined constant. Stacks the value 1
Increments the value at the top of the stack.
Decrements the value at the top of the stack.