- Previous: (7.3.1) The sets of characters tested for by the isalnum, isalpha, iscntrl, islower, isprint, and isupper functions（isalnum、isalpha、iscntrl、islower、isprint 和 supper 函数测试的字符集）：
- Next: (7.5.1) Whether the mathematics functions set the integer expression errno to the value of the macro ERANGE on underflow range errors（在出现下溢范围错误时，数学函数是否将整数表达式 errno 设置为宏 ERANGE 的值）：
(7.5.1) The values returned by the mathematics functions on domain errors（发生域错误时数学函数返回的值）：
表 E–7 发生域错误时返回的值|
错误 |
数学函数 |
编译器模式 |
|
|---|---|---|---|
|
|
|
-Xs、-Xt |
-Xa、-Xc |
|
DOMAIN |
acos(|x|>1) |
0.0 |
0.0 |
|
DOMAIN |
asin(|x|>1) |
0.0 |
0.0 |
|
DOMAIN |
atan2(+-0,+-0) |
0.0 |
0.0 |
|
DOMAIN |
y0(0) |
-HUGE |
-HUGE_VAL |
|
DOMAIN |
y0(x<0) |
-HUGE |
-HUGE_VAL |
|
DOMAIN |
y1(0) |
-HUGE |
-HUGE_VAL |
|
DOMAIN |
y1(x<0) |
-HUGE |
-HUGE_VAL |
|
DOMAIN |
yn(n,0) |
-HUGE |
-HUGE_VAL |
|
DOMAIN |
yn(n,x<0) |
-HUGE |
-HUGE_VAL |
|
DOMAIN |
log(x<0) |
-HUGE |
-HUGE_VAL |
|
DOMAIN |
log10(x<0) |
-HUGE |
-HUGE_VAL |
|
DOMAIN |
pow(0,0) |
0.0 |
1.0 |
|
DOMAIN |
pow(0,neg) |
0.0 |
-HUGE_VAL |
|
DOMAIN |
pow(neg,non-integal) |
0.0 |
NaN |
|
DOMAIN |
sqrt(x<0) |
0.0 |
NaN |
|
DOMAIN |
fmod(x,0) |
x |
NaN |
|
DOMAIN |
remainder(x,0) |
NaN |
NaN |
|
DOMAIN |
acosh(x<1) |
NaN |
NaN |
|
DOMAIN |
atanh(|x|>1) |
NaN |
NaN |
- Previous: (7.3.1) The sets of characters tested for by the isalnum, isalpha, iscntrl, islower, isprint, and isupper functions（isalnum、isalpha、iscntrl、islower、isprint 和 supper 函数测试的字符集）：
- Next: (7.5.1) Whether the mathematics functions set the integer expression errno to the value of the macro ERANGE on underflow range errors（在出现下溢范围错误时，数学函数是否将整数表达式 errno 设置为宏 ERANGE 的值）：
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