ieee2double - Convert floating-point number from IEEE format to /390 format

Definition	#include <ieee_390.h> extern double ieee2double (double num); ieee2double converts an 8-byte floating-point number num from IEEE format to /390 format and returns it as the result. There is no loss of precision.
Parameters	double num 8-byte floating-point number in IEEE format
Return val.	8-byte floating-point number in /390 format (in the event of success) 0.0 if the IEEE floating-point number is smaller than the smallest number that can be represented in /390 format or if NaN or inf is passed as a parameter. If the IEEE floating-point number is greater than the largest number that can be represented in /390 format, this largest representable number is returned with the corresponding sign. The global variable float_exceptions_flag contains information for the event of unsuccessful conversion and is defined as follows: extern int float_exception_flags; enum { float_flag_inexact = 1, float_flag_divbyzero = 2, float_flag_underflow = 4, float_flag_overflow = 8, float_flag_invalid = 16 }; If the IEEE floating-point number is greater than the largest number that can be represented in /390 format, float_flag_overflow is set. If the IEEE floating-point number is smaller than the smallest number that can be represented in /390 format, float_flag_underflow is set. If NaN or inf is passed as a parameter, float_flag_invalid is set.
See also	float2ieee, float2ieee, double2ieee