Sort three variables: Difference between revisions
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→{{header|Forth}}: correct 'lang' tag solves strike-through text issue
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typically be used directly from the stack by a subsequent operation in the
program.
<
VARIABLE X VARIABLE Y VARIABLE Z
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2DUP < IF SWAP THEN ;
: SORT3INTS ( a b c -- c b a) ?SWAP >R ?SWAP R> ?SWAP ;</
Testing is done using the Forth console using '?' to view VARIABLE contents
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==={{header|Strings}}===
Strings require extending the language but the primitives needed are part of ANS/ISO Forth.
<
: BUFFER: ( n -- ) CREATE ALLOT ;
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\ non-destructive print 3 counted-strings from data stack
: .STRS ( caddr1 caddr2 caddr3 -- caddr1 caddr2 caddr3) \ order is dependant
3 0 DO ROT DUP CR COUNT TYPE LOOP ; </
With these extensions we can do the same testing at the Forth console and
examine the string order with '.STRS'.
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