Math Library: math.h

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Math Library: math.h

Table F.6 lists the functions of the math library. The header file defines a macro HUGE_VAL that is used as the return value for functions when the magnitude of the result exceeds the largest representable value.

Table  F.6. ANSI C standard math functions.

Prototype	Description
double acos(double x);	Returns the angle (0 to p radians) whose cosine is x .
double asin(double x);	Returns the angle (-p/2 to p/2 radians) whose sine is x .
double atan(double x);	Returns the angle (-p/2 to p/2 radians) whose tangent is x .
double atan2(double y, double x);	Returns the angle (-p to p radians) whose tangent is y / x .
double cos(double x);	Returns the cosine of x ( x in radians).
double sin(double x);	Returns the sine of x ( x in radians).
double tan(double x);	Returns the tangent of x ( x in radians).
double cosh(double x);	Returns the hyperbolic cosine of x .
double sinh(double x);	Returns the hyperbolic sine of x .
double tanh(double x);	Returns the hyperbolic tangent of x .
double exp(double x);	Returns the exponential function of x (e x ).
double frexp(double v, int *pt_e);	Breaks a value v into a normalized fraction, which is returned, and a power of 2, which is placed in the location pointed to by pt_e .
double ldexp(double x, int p);	Returns 2 to the p power times x .
double log(double x);	Returns the natural logarithm of x .
double log10(double x);	Returns the base 10 logarithm of x
double modf(double x, double *p);	Breaks x into an integral part and a fraction part, both of the same sign, returns the fractional part and stores the integral part in the location pointed to by p .
double pow(double x, double y);	Returns the x to the y power.
double sqrt(double x);	Returns the square root of x .
double ceil(double x);	Returns the smallest integral value not less than x .
double fabs(double x);	Returns the absolute value of x .
double floor(double x);	Returns the largest integral value not greater than x .
int fmod(double x, double y);	Returns the fractional part of x / y .

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