3.4.2 ieee_values(3m)

IEEE values like infinity, NaN, maximum and minimum positive floating-point numbers are provided by the functions described by the ieee_values(3m) man page. Table 3–9, Table 3–10, Table 3–11, and Table 3–12 show the decimal values and hexadecimal IEEE representations of the values provided by ieee_values(3m) functions.

Table 3-9  IEEE Values: Single Precision

IEEE value Decimal value hexadecimal representation C, C++ Fortran max normal 3.40282347e+38 7f7fffff r = max_normalf(); r = r_max_normal() min normal 1.17549435e–38 00800000 r = min_normalf(); r = r_min_normal() max subnormal 1.17549421e–38 007fffff r = max_subnormalf(); r = r_max_subnormal() min subnormal 1.40129846e–45 00000001 r = min_subnormalf(); r = r_min_subnormal() ∞ Infinity 7f800000 r = infinityf(); r = r_infinity() quiet NaN NaN 7fffffff r = quiet_nanf(0); r = r_quiet_nan(0) signaling NaN NaN 7f800001 r = signaling_nanf(0); r = r_signaling_nan(0)

Table 3-10  IEEE Values: Double Precision

IEEE value Decimal Value hexadecimal representation C, C++ Fortran max normal 1.7976931348623157e+308 7fefffff ffffffff d = max_normal(); d = d_max_normal() min normal 2.2250738585072014e–308 00100000 00000000 d = min_normal(); d = d_min_normal() max subnormal 2.2250738585072009e–308 000fffff ffffffff d = max_subnormal(); d = d_max_subnormal() min subnormal 4.9406564584124654e–324 00000000 00000001 d = min_subnormal(); d = d_min_subnormal() ∞ Infinity 7ff00000 00000000 d = infinity(); d = d_infinity() quiet NaN NaN 7fffffff ffffffff d = quiet_nan(0); d = d_quiet_nan(0) signaling NaN NaN 7ff00000 00000001 d = signaling_nan(0); d = d_signaling_nan(0)

Table 3-11  IEEE Values: Quadruple Precision

IEEE value Decimal value hexadecimal representation C, C++ (SPARC) Fortran (all) max normal 1.1897314953572317650857593266280070e+4932 7ffeffff ffffffff ffffffff ffffffff q = max_normall(); q = q_max_normal() min normal 3.3621031431120935062626778173217526e–4932 00010000 00000000 00000000 00000000 q = min_normall(); q = q_min_normal() max subnormal 3.3621031431120935062626778173217520e–4932 0000ffff ffffffff ffffffff ffffffff q = max_subnormall(); q = q_max_subnormal() min subnormal 6.4751751194380251109244389582276466e–4966 00000000 00000000 00000000 00000001 q = min_subnormall(); q = q_min_subnormal() ∞ Infinity 7fff0000 00000000 00000000 00000000 q = infinityl(); q = q_infinity() quiet NaN NaN 7fff8000 00000000 00000000 00000000 q = quiet_nanl(0); q = q_quiet_nan(0) signaling NaN NaN 7fff0000 00000000 00000000 00000001 q = signaling_nanl(0); q = q_signaling_nan(0)

Table 3-12  IEEE Values: Double-Extended Precision (x86)

IEEE value Decimal value hexadecimal representation (80 bits) C, C++ max normal 1.18973149535723176505e+4932 7ffe ffffffff ffffffff x = max_normall(); min positive normal 3.36210314311209350626e–4932 0001 80000000 00000000 x = min_normall(); max subnormal 3.36210314311209350608e–4932 0000 7fffffff ffffffff x = max_subnormall(); min positive subnormal 1.82259976594123730126e–4951 0000 00000000 00000001 x = min_subnormall(); ∞ Infinity 7fff 80000000 00000000 x = infinityl(); quiet NaN NaN 7fff c0000000 00000000 x = q signaling NaN NaN 7fff 80000000 00000001 x = signaling_nanl(0);