+d_double_has_inf (longdblfio.U):
+ This variable conditionally defines the symbol DOUBLE_HAS_INF
+ which indicates that the double type has an infinity.
+
+d_double_has_nan (longdblfio.U):
+ This variable conditionally defines the symbol DOUBLE_HAS_INF
+ which indicates that the double type has a not-a-number.
+
+d_double_has_negative_zero (longdblfio.U):
+ This variable conditionally defines the symbol DOUBLE_HAS_NEGATIVE_ZERO
+ which indicates that the double type has a negative zero.
+
+d_double_has_subnormals (longdblfio.U):
+ This variable conditionally defines the symbol DOUBLE_HAS_SUBNORMALS
+ which indicates that the double type has subnormals (denormals).
+
+d_double_style_cray (longdblfio.U):
+ This variable conditionally defines the symbol DOUBLE_STYLE_CRAY
+ which indicates that the double is the 64-bit CRAY mainframe format.
+
+d_double_style_ibm (longdblfio.U):
+ This variable conditionally defines the symbol DOUBLE_STYLE_IBM,
+ which indicates that the double is the 64-bit IBM mainframe format.
+
+d_double_style_ieee (longdblfio.U):
+ This variable conditionally defines the symbol DOUBLE_STYLE_IEEE,
+ which indicates that the double is the 64-bit IEEE 754.
+
+d_double_style_vax (longdblfio.U):
+ This variable conditionally defines the symbol DOUBLE_STYLE_VAX,
+ which indicates that the double is the 64-bit VAX format D or G.
+