Compiler Library/XL Reference Manual (32650-90029)

2- 15

Error: If the argument is a NaN, there are two

possible actions. If the INVALID trap is

enabled, the message "DINT(X) OR DDINT(X):

X=NaN" occurs. Otherwise, the INVALID flag is

set. In either case, a quiet NaN is returned.

DDIV (or DDIV')

DDIV calculates the quotient of one integer number divided by another

integer number. See the description of the DREM procedure for the

remainder.

Declaration

FUNCTION DDIV(VAR d1,d2:INTEGER):INTEGER; EXTERNAL;

Attributes

Parameters: Both arguments are integer numbers.

Result: An integer number (the quotient only).

HP FORTRAN 77/XL: Callable as a system intrinsic: I = DDIV(J,K)

Error: If the parameter D2 equals zero, the arithmetic

trap INTEGER DIVIDE BY ZERO occurs if traps are

enabled.

DEXP (or DEXP')

DEXP calculates

, where

is a longreal number.

Declaration

FUNCTION DEXP(VAR x:LONGREAL):LONGREAL; EXTERNAL;

Accuracy

Attributes

Parameter: A representable longreal number in the range

[-708.396418532264, 709.782712893384]. See

Chapter 1 for details on the internal

representation of real numbers.

Result: A representable positive longreal number.

HP FORTRAN 77/XL: Intrinsic function: Y=DEXP(X).

Error: If the argument is a NaN, there are two

possible actions. If the INVALID trap is

enabled, the message "DEXP(X): X=NaN" occurs.

Otherwise, the INVALID flag is set. In either

case, a quiet NaN is returned.

If the argument is >= 709.78271289338397 the

message "DEXP(X) OVERFLOW" occurs and the

result is infinity. If the argument is <=

-708.39641853226408 the message "DEXP(X)

UNDERFLOW" occurs and the result is set to

zero.

When x-y ~ ∈ , maximum f-g ~ ∈