9.3.115 PRECISION (X)

Description:  Returns the decimal precision in the model representing real numbers with the same kind parameter as the argument. 
Class:  Inquiry function; Generic 
Arguments:  X must be of type real or complex. It can be scalar or array valued. 
Results:  The result is a scalar of type default integer. The result has the value INT((DIGITS(X) - 1) * LOG10(RADIX(X))). If RADIX(X) is an integral power of 10, 1 is added to the result. 


If X is a REAL(4) value, PRECISION (X) has the value 6. The value 6 is derived from INT ((24-1) * LOG10 (2.)) = INT (6.92...). For more information on the model for REAL(4), see Section D.2.

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