HP C A.06.05 Reference Manual

HP C/HP-UX Implementation Topics
Conversions Between Floats, Doubles, and Long Doubles
Chapter 10 249
Conversions Between Floats, Doubles, and Long Doubles
• When a long double is converted to a double or float, or when a double is converted to
a float, the original value is rounded to the nearest representable value as the new type.
If the original value is equally close to two distinct representable values, then the value
chosen is the one with the least significant bit equal to zero.
• Conversions between floating-point types involve a change in the exponent, as well as the
mantissa. It is possible for such a conversion to overflow.