HP SunSoft Pascal 4.0 Uživatelský manuál stáhnout pdf (Strana 267)

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101

Math Libraries 243

The syntax of this function is described in the ieee_flags(3M) man page.

If an exception is raised at any time during program execution, then its ﬂag is

set, unless it is explicitly cleared. Clearing accrued exceptions is done by a call,

as shown in the following Pascal program.

program TestIEEEFlags(output);

#include "math_p.h"

var

FlAction, FlMode, FlIn: string;

FlOut: string_pointer;

Zero: integer := 0;

begin

writeln(sqr(-1)); { Invalid operation }

writeln(1 / Zero); { Division by zero }

writeln(exp(709.8)); { Overflow }

writeln(exp(-708.5)); { Underflow }

writeln(log(1.1)); { Inexact }

FlAction := 'clear';

FlMode := 'exception';

FlIn := 'all';

writeln(ieee_flags(FlAction, FlMode, FlIn, FlOut));

end.

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