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The C <math.h> header file declares a set of functions to perform mathematical operations, such as: sqrt() calculates the square root, log() finds the natural logarithm of a number, etc.
math.h The header file defines various mathematical functions and a macro. All available functions in this library have a double Type of parameters, and all return double Type of result.
The following is the only macro defined in this library:
| Serial Number | Macro & Description |
|---|---|
| 1 | HUGE_VAL When the result of the function cannot be represented as a floating-point number. If it is because the magnitude of the result is too large to be represented, the function will set errno to ERANGE to indicate a range error, and return a value by the macro HUGE_VAL or its negation (- HUGE_VAL) named a specific very large value. If the magnitude of the result is too small, zero will be returned. In this case, error may be set to ERANGE, or it may not be set to ERANGE. |
The following lists the functions defined in the header file math.h:
| Serial Number | Function & Description |
|---|---|
| 1 | double acos(double x) Returns the arccosine of x, expressed in radians. |
| 2 | double asin(double x) Returns the arcsine of x, expressed in radians. |
| 3 | double atan(double x) Returns the arctangent of x, expressed in radians. |
| 4 | double atan2(double y, double x) Returns the arctangent of y, expressed in radians/The arctangent of x. The signs of y and x determine the correct quadrant. |
| 5 | double cos(double x) Returns the cosine of the radian angle x. |
| 6 | double cosh(double x) Returns the hyperbolic cosine of x. |
| 7 | double sin(double x) Returns the sine of the 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 power of x. |
| 11 | double frexp(double x, int *exponent) Decomposes the floating-point number x into a mantissa and an exponent. The returned value is the mantissa, and the exponent is stored in exponent. The value is x = mantissa * 2 ^ exponent. |
| 12 | double ldexp(double x, int exponent) Returns x multiplied by 2 to the power of exponent. |
| 13 | double log(double x) Returns the natural logarithm (base e) of x. |
| 14 | double log10(double x) Returns the common logarithm (base 10) of x. 10 logarithm). |
| 15 | double modf(double x, double *integer) Returns the fractional part (the part after the decimal point) of the value, and sets integer to the integer part. |
| 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 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 less than or equal to x. |
| 21 | double acosh(double x) Returns the inverse hyperbolic cosine of x, expressed in radians. |
| 22 | double fmod(double x, double y) Returns the remainder of x divided by y. |
| 23 | double asinh(double x) Returns the inverse hyperbolic sine of the parameter. |
| 24 | double atanh(double x) Returns the inverse hyperbolic tangent of the parameter. |
| 25 | double hypot(double p, double b) Calculate the hypotenuse of a right triangle. |