Language Reference

PRECISION(X)

Returns the decimal precision in the model representing real numbers with the same kind type parameter as the argument.

X

must be of type real or complex. It may be scalar or array valued.

Class

Inquiry function

Result Type and Attributes

Default integer scalar.

Result Value

The result is:

INT( (DIGITS(X) - 1) * LOG10(2) )

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Therefore,

       Type               Precision
--------------------      ---------
 real(4) , complex(4)           6
 real(8) , complex(8)          15
real(16) , complex(16)         31

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Examples

PRECISION (X) = INT( (24 - 1) * LOG10(2.) ) = INT(6.92 ...) = 6 for X of type real(4). See Real Data Model.

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