Language Reference

Data Representation Models

Integer Bit Model

The following model shows how the processor represents each bit of a nonnegative scalar integer object:

j

is the integer value

s

is the number of bits

w_k

is binary digit w located at position k

+-------------------------------IBM Extension--------------------------------+

XL Fortran implements the following s parameters for the XL Fortran integer kind type parameters:

+----------------------------End of IBM Extension----------------------------+

The following intrinsic functions use this model:

Integer Data Model

i

is the integer value

s

is the sign (±1)

q

is the number of digits (positive integer)

w_k

is a nonnegative digit < r

r

is the radix

+-------------------------------IBM Extension--------------------------------+

XL Fortran implements this model with the following r and q parameters:

+----------------------------End of IBM Extension----------------------------+

The following intrinsic functions use this model:

Real Data Model

x

is the real value

s

is the sign (±1)

b

is an integer > 1

e

is an integer, where e_min <= e <= e_max

p

is an integer > 1

f_k

is a nonnegative integer < b (f₁ <> 0)

Note:

If x=0, then e=0 and all f_k=0.

+-------------------------------IBM Extension--------------------------------+

XL Fortran implements this model with the following parameters:

+----------------------------End of IBM Extension----------------------------+

The following intrinsic functions use this model: