HP SunSoft Pascal 4.0 - Manual (Page 264)

240 Pascal 4.0 User’s Guide
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Division by zero —The divisor is zero, and the dividend is a finite non-zero
number; or, more generally, an exact infinite result is delivered by an
operation on finite operands.
• Overflow —The correctly rounded result is larger than the largest number in
the required precision.
• Underflow —The number is too small, or precision is lost, and no signal
handler is established for underflow.
• Inexact —The rounded result of a valid operation is different from the
infinitely precise result. This exception occurs whenever there is untrapped
overflow or untrapped underflow.
Math Library Exception-Handling Function: matherr()
Some libm functions are specified to call matherr() when an exception is
detected. You can redefine matherr() by including a function named
matherr() in the program. When an exception occurs, a pointer to the
exception structure, exc , is passed to the user-supplied matherr() function.
This structure, defined in the math_p.h header file, is as follows:
The element kind is an integer constant that describes the type of exception
that occurred, and is one of the following constants. These constants are
defined in the header file.
type
exception = record
kind: integer;
name: ^string;
arg1: double;
arg2: double;
retval: double;
end;