C Standard Library - <math.h>
Introduction
math.h The header file defines various mathematical functions and a macro. All functions available in this library take a parameter of type double and return a result of type double.
Library macro
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 the magnitude of the result is too large to be represented, the function sets errno to ERANGE to indicate a range error, and returns a specific large value named by the macro HUGE_VAL or its negation (-HUGE_VAL). If the magnitude of the result is too small, a zero value will be returned. In this case, error may or may not be set to ERANGE. |
Library functions
The functions defined in the header file math.h are listed below:
| Serial number | Function & Description |
|---|---|
| 1 | double acos(double x) Returns the inverse cosine of x in radians. |
| 2 | double asin(double x) Returns the arcsine of x in radians. |
| 3 | double atan(double x) Returns the arctangent of x in radians. |
| 4 | double atan2(double y, double x) Returns the arctangent of y/x in radians. The sign of the y and x values determines the correct quadrant. |
| 5 | double cos(double x) Returns the cosine of the angle x in radians. |
| 6 | double cosh(double x) Returns the hyperbolic cosine of x. |
| 7 | double sin(double x) Returns the sine of the angle x in radians. |
| 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) Decompose the floating point number x into mantissa and exponent. The return value is the mantissa and the exponent is stored in exponent. The resulting value is x = mantissa * 2 ^ exponent. |
| 12 | double ldexp(double x, int exponent) Returns x multiplied by 2 raised to the exponent power. |
| 13 | double log(double x) Returns the natural logarithm of x (logarithm of base e). |
| 14 | double log10(double x) Returns the common logarithm of x (base 10 logarithm). |
| 15 | double modf(double x, double *integer) The return value is the decimal part (the part after the decimal point), and the integer is set to the integer part . |
| 16 | double pow(double x, double y) Returns x raised to the y power. |
| 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. |
