📅  最后修改于: 2020-12-19 05:38:29             🧑  作者: Mango
math.h标头定义了各种数学函数和一个宏。该库中所有可用的函数都将double作为参数,并返回double作为结果。
该库中仅定义了一个宏-
Sr.No. | Macro & Description |
---|---|
1 |
HUGE_VAL This macro is used when the result of a function may not be representable as a floating point number. If magnitude of the correct result is too large to be represented, the function sets errno to ERANGE to indicate a range error, and returns a particular, very large value named by the macro HUGE_VAL or its negation (- HUGE_VAL). If the magnitude of the result is too small, a value of zero is returned instead. In this case, errno might or might not be set to ERANGE. |
以下是标头math.h中定义的函数-
Sr.No. | Function & Description |
---|---|
1 |
double acos(double x)
Returns the arc cosine of x in radians. |
2 |
double asin(double x)
Returns the arc sine of x in radians. |
3 |
double atan(double x)
Returns the arc tangent of x in radians. |
4 |
double atan2(double y, double x)
Returns the arc tangent in radians of y/x based on the signs of both values to determine the correct quadrant. |
5 |
double cos(double x)
Returns the cosine of a radian angle x. |
6 |
double cosh(double x)
Returns the hyperbolic cosine of x. |
7 |
double sin(double x)
Returns the sine of a radian angle x. |
8 |
double sinh(double x)
Returns the hyperbolic sine of x. |
9 |
double tanh(double x)
Returns the hyperbolic tangent of x. |
10 |
double exp(double x)
Returns the value of e raised to the xth power. |
11 |
double frexp(double x, int *exponent)
The returned value is the mantissa and the integer pointed to by exponent is the exponent. The resultant value is x = mantissa * 2 ^ exponent. |
12 |
double ldexp(double x, int exponent)
Returns x multiplied by 2 raised to the power of exponent. |
13 |
double log(double x)
Returns the natural logarithm (base-e logarithm) of x. |
14 |
double log10(double x)
Returns the common logarithm (base-10 logarithm) of x. |
15 |
double modf(double x, double *integer)
The returned value is the fraction component (part after the decimal), and sets integer to the integer component. |
16 |
double pow(double x, double y)
Returns x raised to the power of y. |
17 |
double sqrt(double x)
Returns the square root of x. |
18 |
double ceil(double x)
Returns the smallest integer value greater than or equal to x. |
19 |
double fabs(double x)
Returns the absolute value of x. |
20 |
double floor(double x)
Returns the largest integer value less than or equal to x. |
21 |
double fmod(double x, double y)
Returns the remainder of x divided by y. |