By Bezemer J.L.
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Begin) cr 10 5 9 depth . 1 Booleans and numbers You might have expected we had discussed this subject much earlier. But we haven’t and for one very good reason. We’ve told you a few chapters ago that ’IF’ branches if the top of the stack is non-zero. Any number will do. " I’m here" then ; test In fact, it doesn’t! Why? Well, ’AND’ is a BINARY operator, not a LOGICAL operator. That means it reacts on bit-patterns. Given two numbers, it will evaluate bits at the same position. The number "1" is "01" in binary.
The second version did too, but not after giving us a message. Can’t we make a version in which we can have another try? " The number was " . cr ; retry-it This version will not only catch the error, but it allows us to have another go! We can keep on entering "0", until we enter a nonzero value. Isn’t that great? But it gets even better! We can exhaust the stack, trigger a system exception and still keep on going. But let’s take it one step at the time. First we change "COULD-FAIL" into: CHAPTER 5.
Your customers want a demo, of course. You’re willing to give one to them, but you’re afraid they’re going to use the demo without ever paying for it. One thing you can do is limit the number of entries they can make. So, you copy the source and make a special demo version. But you have to do that for every new release. Wouldn’t it just be easier to have one version of the program and just change one single constant? You can with conditional compilation: true constant DEMO DEMO [if] 256 constant #Entries [else] 65536 constant #Entries [then] variable CurrentEntry create Entries #Entries cells allot We defined a constant, called "DEMO", which is true.