
Math Libraries 243
11
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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