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
|
|
|
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
|
|
|
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
|
|
|
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)
|
|
|
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); |
|