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The following page has been changed by MartinSebor: http://wiki.apache.org/stdcxx/FloatingPoint The comment on the change is: Started documenting platform-specific Infinity and NaN details. New page: = WORK IN PROGRESS = == libc symbols == The table below lists the public symbols defined on each platform for Infinity, Quiet NaN, and Signaling NaN. || || AIX || HP-UX || IRIX || Linux || Solaris || Tru64 UNIX || Windows || || header || <float.h> || || || || || || || || Infinity ||`DBL_INF` || || N/A || `INFINITY` || `infinity()` || `DBL_INFINITY` || || || Quiet NaN ||`DBL_QNAN` || || N/A || `nan("")` || `quiet_nan(long)` || `DBL_QNAN` || || || Signaling NaN ||`DBL_SNAN` || || N/A || N/A || `signaling_nan(long)`|| `DBL_SNAN` || || == printf() formatting == || || AIX || HP-UX || IRIX || Linux || Solaris || Tru64 || || Infinity || `+/- INF` || `+/- inf`|| `+/- inf` || `+/- inf` || `+/- Inf` || `+/- INF` || || Quiet NaN || `+/- NaNQ` || `+/- nan`|| `+/- nan0xxx` || `+/- nan` || `+/- NaN` || `NaNQ` || || Signaling NaN || `+/- NaNS` || `+/- nan`|| `+/- nan0xxx` || `+/- nan` || `+/- NaN` || `NaNS` || == numeric_limits<double> values/formatting == || || AIX || HP-UX || IRIX || Linux || Solaris/x86 || Tru64 || || || XLC++ 9.0 || aCC 3,6 || MIPSpro || gcc || Sun C++ || HP C++ || || `infinity()` || `INF` || `inf` || `inf` || `inf` || `Inf` || 0 || || `quiet_NaN()` || `-NaNQ` || `nan` || `nan0xxx` || `nan` || `NaN` || 0 || || `signaling_NaN()`|| `-INF` || `nan` || `nan0xxx` || `nan` || `NaN` || 0 || AIX/Power: INF: INF: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0 QNAN: NaNQ: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0x80000 SNAN: NaNS: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0x5555555500055555 HP-UX/IPF: INF: inf: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0 QNAN: nan: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0x40000 SNAN: nan: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0x80000 HP-UX/PA INF: inf: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0 QNAN: nan: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0x40000 SNAN: nan: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0x80000 Linux/x86_64 INF: inf: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0 QNAN: nan: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0x80000 SNAN: nan: signbit = 0 sign = 0, exponent = 0x7ff, fraction = 0x40000 Tru64 UNIX INF: INF: signbit = 0 sign = 0, exponent = 0, fraction = 0x7ff0000000000000 QNAN: NaNQ: signbit = 0x1 sign = 0, exponent = 0, fraction = 0xfff8000000000000 SNAN: NaNS: signbit = 0 sign = 0x1, exponent = 0x2aa, fraction = 0x7ff5555500055555
