TAL Reference Manual

Data Representation

TAL Reference Manual—526371-001

3-15

Examples of REAL and REAL (64) Numeric

Constants

integer

is one or more decimal digits that compose the integer part.

fraction

is one or more decimal digits that compose the fractional part.

E and L

are suffixes that specify floating-point constants:

REAL E

REAL(64) L

exponent

is one or two decimal digits that compose the exponential part.

Examples of REAL and REAL (64) Numeric Constants

Here are the examples of REAL and REAL(64) numeric constants. The examples

show the integer part, the fractional part, the E or L suffix, and the exponent part:

Storage Format

The system stores the number in binary scientific notation in the form:

X * 2 Y

X is a value of at least 1 but less than 2. Because the integer part of X is always 1, only

the fractional part of X is stored.

The exponent can be in the range –256 through 255 (%377). The system adds 256

(%400) to the exponent before storing it as Y. Thus, the value stored as Y is in the

range 0 through 511 (%777), and the exponent is Y minus 256.

If the value of the number to be represented is zero, the sign is 0, the fraction is 0, and

the exponent is 0.

Decimal Value REAL REAL (64)

0.0E0 0.0L0

2.0e0

0.2E1

20.0E-1

2.0L0

0.2L1

20.0L-1

-17.2

-17.2E0

-1720.0E-2

-17.2L0

-1720.0L-2