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FIB8087.PAS
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Pascal/Delphi Source File
|
1989-05-02
|
1KB
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45 lines
{ Copyright (c) 1985, 1989 by Borland International, Inc. }
{$N+,E+}
program Fib8087;
{
Sample program from P-335 in the Owner's Handbook that
demonstrates how to avoid 8087 stack overflow in recursive
functions that use the 8087 math co-processor. Local variables
are used to store temporary results on the 8086 stack.
}
var
i : integer;
function Fib(N : integer) : extended;
{ calculate the fibonacci sequence for N }
var
F1, F2 : extended;
begin
if N = 0 then
Fib := 0.0
else
if N = 1 then
Fib := 1.0
else
begin
(* Use this line instead of the 3 lines that follow this
comment to cause an 8087 stack overflow for values of
N >= 8:
Fib := Fib(N - 1) + Fib(N - 2); { will cause overflow for N > 8 }
*)
F1 := Fib(N - 1); { store results in temporaries on 8086 }
F2 := Fib(N - 2); { stack to avoid 8087 stack overflow }
Fib := F1 + F2;
end;
end; { Fib }
begin
for i := 0 to 15 do
Writeln(i, '. ', Fib(i));
end.