46 lines
1.1 KiB
Plaintext
46 lines
1.1 KiB
Plaintext
|
||
{ Copyright (c) 1985, 87 by Borland International, Inc. }
|
||
|
||
{$N+}
|
||
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.
|
||
|
||
Note: THIS PROGRAM REQUIRES A MATH CO-PROCESSOR
|
||
}
|
||
|
||
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.
|
||
|