forth

I know the AND word defines binary and ... but what defines logical and ? The same word, AND , is also used for logical and . But the two input values to AND are recommended to be well-formed flags ; true and false are represented by two values, bits all set (-1) and bits all unset (0). Other values than these may work as true (as in C), but may lead to subtle errors. All comparison operators return well-formed flags, but for instance - does not. The following evaluates to false (0). 7 5 - 7 3 - AND AND gets bit patterns 100 and 010. The result is 0 (as it does the bitwise and ). References:

I tried to implement a word that produces a string from an array when given a number on the stack in Forth. My first naive attempt was: create myarray s" Alpha" , s" Beta" , s" Charlie" , This was accepted, but it did not work as expected — myarray @ type produces inconsistent output (instead of my naive expectation that it might print "Alpha"). When searching the web, I found in Gforth documentation that a string created with s" has a limited lifetime which means that my ansatz is bound to fail from the beginning. On the other hand, even arrays of regular objects seem to be not standardized