Reverse a string: Difference between revisions
Non-locals Forth version added
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(Non-locals Forth version added) |
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2drop ;
s" testing" 2dup reverse type \ gnitset</lang>
This one doesn't require locals:
<lang forth>: reverse
2dup 1- chars over + \ save string, calculate addresses
begin
over over < \ as long we didn't pass the middle
while \ swap the characters
over c@ over c@ >r over c! over r> swap c!
1- swap 1+ swap \ increment pointers
repeat 2drop \ drop the addresses
;
s" testing" reverse type</lang>
=={{header|Fortran}}==
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