pTAL Reference Manual (H06.03+)

Data Representation

HP pTAL Reference Manual—523746-005

3-3

Specifying Data Types

The syntax for specifying the data type in a variable declaration is:

width

is a constant expression that specifies the width, in bits, of the variable. The value

of width must be appropriate for the data type (see Example 3-1 on page 3-4):

fpoint

is the implied fixed-point (decimal-point) setting. fpoint is an integer in the range

-19 through 19. The default fpoint is 0 (no decimal places).

A positive fpoint specifies the number of places to the right of the decimal point:

FIXED(3) x := 0.642F; ! Stored as 642

A negative fpoint specifies a number of places to the left of the decimal point.

When the value is stored, it is truncated leftward from the decimal point by the

specified number of digits. When the value is accessed, zeros replace the

truncated digits:

FIXED(-3) y := 642945F; ! Stored as 642; accessed as 642000

Data Type Value of width

INT (16)* 16

INT (32) 32

INT (64)* 64

REAL(32)* 32

REAL(64) 64

UNSIGNED(n ) In the range 1 through 31

* Data type alias (see Data Type Aliases on page 3-4)

STRING

INT

REAL

UNSIGNED

FIXED

(

width

(

width )

)

( )fpoint

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