Standard C++ Library Reference ISO/IEC (VERSION3)

float sqrt(float x); [C++ only]
long double sqrt(long double x); [C++ only]
float sqrtf(float x); [required with C99]
long double sqrtl(long double x); [required with C99]
double tan(double x);
float tan(float x); [C++ only]
long double tan(long double x); [C++ only]
float tanf(float x); [required with C99]
long double tanl(long double x); [required with C99]
double tanh(double x);
float tanh(float x); [C++ only]
long double tanh(long double x); [C++ only]
float tanhf(float x); [required with C99]
long double tanhl(long double x); [required with C99]
abs, fabs, fabsf, fabsl
double abs(double x); [C++ only]
float abs(float x); [C++ only]
long double abs(long double x); [C++ only]
double fabs(double x);
float fabs(float x); [C++ only]
long double fabs(long double x); [C++ only]
float fabsf(float x); [required with C99]
long double fabsl(long double x); [required with C99]
The function returns the magnitude of x, |x|.
acos, acosf, acosl
double acos(double x);
float acos(float x); [C++ only]
long double acos(long double x); [C++ only]
float acosf(float x); [required with C99]
long double acosl(long double x); [required with C99]
The function returns the angle whose cosine is x, in the range [0, pi] radians. A domain error
occurs if 1 < |x|.