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Standard library header <cmath>

From natekohl.net
< cpp‎ | header
 
 
 

This header was originally in the C standard library as <math.h>.

This header is part of the numeric library.

Contents

[edit] Macro constants

indicates the overflow value for float, double and long double respectively
(macro constant) [edit]
(C++11)
evaluates to positive infinity or the value guaranteed to overflow a float
(macro constant) [edit]
(C++11)
evaluates to a quiet NaN of type float
(macro constant) [edit]
defines the error handling mechanism used by the common mathematical functions
(macro constant) [edit]
Classification
(C++11)(C++11)(C++11)(C++11)(C++11)
indicates a floating-point category
(macro constant) [edit]

[edit] Types

float_t
(C++11)
most efficient floating-point type at least as wide as float
(typedef) [edit]
double_t
(C++11)
most efficient floating-point type at least as wide as double
(typedef) [edit]

[edit] Functions

Basic operations
absolute value of a floating point value (|x|)
(function) [edit]
(C++11)(C++11)
remainder of the floating point division operation
(function) [edit]
(C++11)(C++11)(C++11)
signed remainder of the division operation
(function) [edit]
(C++11)(C++11)(C++11)
signed remainder as well as the three last bits of the division operation
(function) [edit]
(C++11)(C++11)(C++11)
fused multiply-add operation
(function) [edit]
(C++11)(C++11)(C++11)
larger of two floating point values
(function) [edit]
(C++11)(C++11)(C++11)
smaller of two floating point values
(function) [edit]
(C++11)(C++11)(C++11)
positive difference of two floating point values (max(0, x-y))
(function) [edit]
(C++11)(C++11)(C++11)
not-a-number (NaN)
(function) [edit]
Linear interpolation
(C++20)
linear interpolation function
(function) [edit]
Exponential functions
(C++11)(C++11)
returns e raised to the given power (ex)
(function) [edit]
(C++11)(C++11)(C++11)
returns 2 raised to the given power (2x)
(function) [edit]
(C++11)(C++11)(C++11)
returns e raised to the given power, minus one (ex-1)
(function) [edit]
(C++11)(C++11)
computes natural (base e) logarithm (ln(x))
(function) [edit]
(C++11)(C++11)
computes common (base 10) logarithm (log10(x))
(function) [edit]
(C++11)(C++11)(C++11)
base 2 logarithm of the given number (log2(x))
(function) [edit]
(C++11)(C++11)(C++11)
natural logarithm (to base e) of 1 plus the given number (ln(1+x))
(function) [edit]
Power functions
(C++11)(C++11)
raises a number to the given power (xy)
(function) [edit]
(C++11)(C++11)
computes square root (x)
(function) [edit]
(C++11)(C++11)(C++11)
computes cubic root (3x)
(function) [edit]
(C++11)(C++11)(C++11)
computes square root of the sum of the squares of two given numbers (x2
+y2
)
(function) [edit]
Trigonometric functions
(C++11)(C++11)
computes sine (sin(x))
(function) [edit]
(C++11)(C++11)
computes cosine (cos(x))
(function) [edit]
(C++11)(C++11)
computes tangent (tan(x))
(function) [edit]
(C++11)(C++11)
computes arc sine (arcsin(x))
(function) [edit]
(C++11)(C++11)
computes arc cosine (arccos(x))
(function) [edit]
(C++11)(C++11)
computes arc tangent (arctan(x))
(function) [edit]
(C++11)(C++11)
arc tangent, using signs to determine quadrants
(function) [edit]
Hyperbolic functions
(C++11)(C++11)
computes hyperbolic sine (sh(x))
(function) [edit]
(C++11)(C++11)
computes hyperbolic cosine (ch(x))
(function) [edit]
(C++11)(C++11)
hyperbolic tangent
(function) [edit]
(C++11)(C++11)(C++11)
computes the inverse hyperbolic sine (arsinh(x))
(function) [edit]
(C++11)(C++11)(C++11)
computes the inverse hyperbolic cosine (arcosh(x))
(function) [edit]
(C++11)(C++11)(C++11)
computes the inverse hyperbolic tangent (artanh(x))
(function) [edit]
Error and gamma functions
(C++11)(C++11)(C++11)
error function
(function) [edit]
(C++11)(C++11)(C++11)
complementary error function
(function) [edit]
(C++11)(C++11)(C++11)
gamma function
(function) [edit]
(C++11)(C++11)(C++11)
natural logarithm of the gamma function
(function) [edit]
Nearest integer floating point operations
(C++11)(C++11)
nearest integer not less than the given value
(function) [edit]
(C++11)(C++11)
nearest integer not greater than the given value
(function) [edit]
(C++11)(C++11)(C++11)
nearest integer not greater in magnitude than the given value
(function) [edit]
(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)
nearest integer, rounding away from zero in halfway cases
(function) [edit]
(C++11)(C++11)(C++11)
nearest integer using current rounding mode
(function) [edit]
(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)
nearest integer using current rounding mode with
exception if the result differs
(function) [edit]
Floating point manipulation functions
(C++11)(C++11)
decomposes a number into significand and a power of 2
(function) [edit]
(C++11)(C++11)
multiplies a number by 2 raised to a power
(function) [edit]
(C++11)(C++11)
decomposes a number into integer and fractional parts
(function) [edit]
(C++11)(C++11)(C++11)(C++11)(C++11)(C++11)
multiplies a number by FLT_RADIX raised to a power
(function) [edit]
(C++11)(C++11)(C++11)
extracts exponent of the number
(function) [edit]
(C++11)(C++11)(C++11)
extracts exponent of the number
(function) [edit]
(C++11)(C++11) (C++11)(C++11)(C++11)(C++11)
next representable floating point value towards the given value
(function) [edit]
(C++11)(C++11)(C++11)
copies the sign of a floating point value
(function) [edit]
Classification and comparison
categorizes the given floating point value
(function) [edit]
(C++11)
checks if the given number has finite value
(function) [edit]
(C++11)
checks if the given number is infinite
(function) [edit]
(C++11)
checks if the given number is NaN
(function) [edit]
(C++11)
checks if the given number is normal
(function) [edit]
(C++11)
checks if the given number is negative
(function) [edit]
(C++11)
checks if the first floating-point argument is greater than the second
(function) [edit]
checks if the first floating-point argument is greater or equal than the second
(function) [edit]
(C++11)
checks if the first floating-point argument is less than the second
(function) [edit]
checks if the first floating-point argument is less or equal than the second
(function) [edit]
checks if the first floating-point argument is less or greater than the second
(function) [edit]
checks if two floating-point values are unordered
(function) [edit]
Special mathematical functions
associated Laguerre polynomials
(function) [edit]
associated Legendre polynomials
(function) [edit]
(C++17)(C++17)(C++17)
beta function
(function) [edit]
(complete) elliptic integral of the first kind
(function) [edit]
(complete) elliptic integral of the second kind
(function) [edit]
(complete) elliptic integral of the third kind
(function) [edit]
regular modified cylindrical Bessel functions
(function) [edit]
cylindrical Bessel functions (of the first kind)
(function) [edit]
irregular modified cylindrical Bessel functions
(function) [edit]
cylindrical Neumann functions
(function) [edit]
(C++17)(C++17)(C++17)
(incomplete) elliptic integral of the first kind
(function) [edit]
(C++17)(C++17)(C++17)
(incomplete) elliptic integral of the second kind
(function) [edit]
(C++17)(C++17)(C++17)
(incomplete) elliptic integral of the third kind
(function) [edit]
(C++17)(C++17)(C++17)
exponential integral
(function) [edit]
(C++17)(C++17)(C++17)
Hermite polynomials
(function) [edit]
(C++17)(C++17)(C++17)
Legendre polynomials
(function) [edit]
(C++17)(C++17)(C++17)
Laguerre polynomials
(function) [edit]
Riemann zeta function
(function) [edit]
spherical Bessel functions (of the first kind)
(function) [edit]
spherical associated Legendre functions
(function) [edit]
spherical Neumann functions
(function) [edit]

[edit] Synopsis

namespace std {
  using float_t = /*see definition*/;
  using double_t = /*see definition*/;
}
 
#define HUGE_VAL /*see definition*/
#define HUGE_VALF /*see definition*/
#define HUGE_VALL /*see definition*/
#define INFINITY /*see definition*/
#define NAN /*see definition*/
#define FP_INFINITE /*see definition*/
#define FP_NAN /*see definition*/
#define FP_NORMAL /*see definition*/
#define FP_SUBNORMAL /*see definition*/
#define FP_ZERO /*see definition*/
#define FP_FAST_FMA /*see definition*/
#define FP_FAST_FMAF /*see definition*/
#define FP_FAST_FMAL /*see definition*/
#define FP_ILOGB0 /*see definition*/
#define FP_ILOGBNAN /*see definition*/
#define MATH_ERRNO /*see definition*/
#define MATH_ERREXCEPT /*see definition*/
 
#define math_errhandling /*see definition*/
 
namespace std {
  float acos(float x);
  double acos(double x);
  long double acos(long double x);
  float acosf(float x);
  long double acosl(long double x);
 
  float asin(float x);
  double asin(double x);
  long double asin(long double x);
  float asinf(float x);
  long double asinl(long double x);
 
  float atan(float x);
  double atan(double x);
  long double atan(long double x);
  float atanf(float x);
  long double atanl(long double x);
 
  float atan2(float y, float x);
  double atan2(double y, double x);
  long double atan2(long double y, long double x);
  float atan2f(float y, float x);
  long double atan2l(long double y, long double x);
 
  float cos(float x);
  double cos(double x);
  long double cos(long double x);
  float cosf(float x);
  long double cosl(long double x);
 
  float sin(float x);
  double sin(double x);
  long double sin(long double x);
  float sinf(float x);
  long double sinl(long double x);
 
  float tan(float x);
  double tan(double x);
  long double tan(long double x);
  float tanf(float x);
  long double tanl(long double x);
 
  float acosh(float x);
  double acosh(double x);
  long double acosh(long double x);
  float acoshf(float x);
  long double acoshl(long double x);
 
  float asinh(float x);
  double asinh(double x);
  long double asinh(long double x);
  float asinhf(float x);
  long double asinhl(long double x);
 
  float atanh(float x);
  double atanh(double x);
  long double atanh(long double x);
  float atanhf(float x);
  long double atanhl(long double x);
 
  float cosh(float x);
  double cosh(double x);
  long double cosh(long double x);
  float coshf(float x);
  long double coshl(long double x);
 
  float sinh(float x);
  double sinh(double x);
  long double sinh(long double x);
  float sinhf(float x);
  long double sinhl(long double x);
 
  float tanh(float x);
  double tanh(double x);
  long double tanh(long double x);
  float tanhf(float x);
  long double tanhl(long double x);
 
  float exp(float x);
  double exp(double x);
  long double exp(long double x);
  float expf(float x);
  long double expl(long double x);
 
  float exp2(float x);
  double exp2(double x);
  long double exp2(long double x);
  float exp2f(float x);
  long double exp2l(long double x);
 
  float expm1(float x);
  double expm1(double x);
  long double expm1(long double x);
  float expm1f(float x);
  long double expm1l(long double x);
 
  float frexp(float value, int* exp);
  double frexp(double value, int* exp);
  long double frexp(long double value, int* exp);
  float frexpf(float value, int* exp);
  long double frexpl(long double value, int* exp);
 
  int ilogb(float x);
  int ilogb(double x);
  int ilogb(long double x);
  int ilogbf(float x);
  int ilogbl(long double x);
 
  float ldexp(float x, int exp);
  double ldexp(double x, int exp);
  long double ldexp(long double x, int exp);
  float ldexpf(float x, int exp);
  long double ldexpl(long double x, int exp);
 
  float log(float x);
  double log(double x);
  long double log(long double x);
  float logf(float x);
  long double logl(long double x);
 
  float log10(float x);
  double log10(double x);
  long double log10(long double x);
  float log10f(float x);
  long double log10l(long double x);
 
  float log1p(float x);
  double log1p(double x);
  long double log1p(long double x);
  float log1pf(float x);
  long double log1pl(long double x);
 
  float log2(float x);
  double log2(double x);
  long double log2(long double x);
  float log2f(float x);
  long double log2l(long double x);
 
  float logb(float x);
  double logb(double x);
  long double logb(long double x);
  float logbf(float x);
  long double logbl(long double x);
 
  float modf(float value, float* iptr);
  double modf(double value, double* iptr);
  long double modf(long double value, long double* iptr);
  float modff(float value, float* iptr);
  long double modfl(long double value, long double* iptr);
 
  float scalbn(float x, int n);
  double scalbn(double x, int n);
  long double scalbn(long double x, int n);
  float scalbnf(float x, int n);
  long double scalbnl(long double x, int n);
 
  float scalbln(float x, long int n);
  double scalbln(double x, long int n);
  long double scalbln(long double x, long int n);
  float scalblnf(float x, long int n);
  long double scalblnl(long double x, long int n);
 
  float cbrt(float x);
  double cbrt(double x);
  long double cbrt(long double x);
  float cbrtf(float x);
  long double cbrtl(long double x);
 
  // absolute values
  int abs(int j);
  long int abs(long int j);
  long long int abs(long long int j);
  float abs(float j);
  double abs(double j);
  long double abs(long double j);
 
  float fabs(float x);
  double fabs(double x);
  long double fabs(long double x);
  float fabsf(float x);
  long double fabsl(long double x);
 
  float hypot(float x, float y);
  double hypot(double x, double y);
  long double hypot(long double x, long double y);
  float hypotf(float x, float y);
  long double hypotl(long double x, long double y);
 
  // three-dimensional hypotenuse
  float hypot(float x, float y, float z);
  double hypot(double x, double y, double z);
  long double hypot(long double x, long double y, long double z);
 
  float pow(float x, float y);
  double pow(double x, double y);
  long double pow(long double x, long double y);
  float powf(float x, float y);
  long double powl(long double x, long double y);
 
  float sqrt(float x);
  double sqrt(double x);
  long double sqrt(long double x);
  float sqrtf(float x);
  long double sqrtl(long double x);
 
  float erf(float x);
  double erf(double x);
  long double erf(long double x);
  float erff(float x);
  long double erfl(long double x);
 
  float erfc(float x);
  double erfc(double x);
  long double erfc(long double x);
  float erfcf(float x);
  long double erfcl(long double x);
 
  float lgamma(float x);
  double lgamma(double x);
  long double lgamma(long double x);
  float lgammaf(float x);
  long double lgammal(long double x);
 
  float tgamma(float x);
  double tgamma(double x);
  long double tgamma(long double x);
  float tgammaf(float x);
  long double tgammal(long double x);
 
  float ceil(float x);
  double ceil(double x);
  long double ceil(long double x);
  float ceilf(float x);
  long double ceill(long double x);
 
  float floor(float x);
  double floor(double x);
  long double floor(long double x);
  float floorf(float x);
  long double floorl(long double x);
 
  float nearbyint(float x);
  double nearbyint(double x);
  long double nearbyint(long double x);
  float nearbyintf(float x);
  long double nearbyintl(long double x);
 
  float rint(float x);
  double rint(double x);
  long double rint(long double x);
  float rintf(float x);
  long double rintl(long double x);
 
  long int lrint(float x);
  long int lrint(double x);
  long int lrint(long double x);
  long int lrintf(float x);
  long int lrintl(long double x);
 
  long long int llrint(float x);
  long long int llrint(double x);
  long long int llrint(long double x);
  long long int llrintf(float x);
  long long int llrintl(long double x);
 
  float round(float x);
  double round(double x);
  long double round(long double x);
  float roundf(float x);
  long double roundl(long double x);
 
  long int lround(float x);
  long int lround(double x);
  long int lround(long double x);
  long int lroundf(float x);
  long int lroundl(long double x);
 
  long long int llround(float x);
  long long int llround(double x);
  long long int llround(long double x);
  long long int llroundf(float x);
  long long int llroundl(long double x);
 
  float trunc(float x);
  double trunc(double x);
  long double trunc(long double x);
  float truncf(float x);
  long double truncl(long double x);
 
  float fmod(float x, float y);
  double fmod(double x, double y);
  long double fmod(long double x, long double y);
  float fmodf(float x, float y);
  long double fmodl(long double x, long double y);
 
  float remainder(float x, float y);
  double remainder(double x, double y);
  long double remainder(long double x, long double y);
  float remainderf(float x, float y);
  long double remainderl(long double x, long double y);
 
  float remquo(float x, float y, int* quo);
  double remquo(double x, double y, int* quo);
  long double remquo(long double x, long double y, int* quo);
  float remquof(float x, float y, int* quo);
  long double remquol(long double x, long double y, int* quo);
 
  float copysign(float x, float y);
  double copysign(double x, double y);
  long double copysign(long double x, long double y);
  float copysignf(float x, float y);
  long double copysignl(long double x, long double y);
 
  double nan(const char* tagp);
  float nanf(const char* tagp);
  long double nanl(const char* tagp);
 
  float nextafter(float x, float y);
  double nextafter(double x, double y);
  long double nextafter(long double x, long double y);
  float nextafterf(float x, float y);
  long double nextafterl(long double x, long double y);
 
  float nexttoward(float x, long double y);
  double nexttoward(double x, long double y);
  long double nexttoward(long double x, long double y);
  float nexttowardf(float x, long double y);
  long double nexttowardl(long double x, long double y);
 
  float fdim(float x, float y);
  double fdim(double x, double y);
  long double fdim(long double x, long double y);
  float fdimf(float x, float y);
  long double fdiml(long double x, long double y);
 
  float fmax(float x, float y);
  double fmax(double x, double y);
  long double fmax(long double x, long double y);
  float fmaxf(float x, float y);
  long double fmaxl(long double x, long double y);
 
  float fmin(float x, float y);
  double fmin(double x, double y);
  long double fmin(long double x, long double y);
  float fminf(float x, float y);
  long double fminl(long double x, long double y);
 
  float fma(float x, float y, float z);
  double fma(double x, double y, double z);
  long double fma(long double x, long double y, long double z);
  float fmaf(float x, float y, float z);
  long double fmal(long double x, long double y, long double z);
 
  // linear interpolation
  constexpr float lerp(float a, float b, float t);
  constexpr double lerp(double a, double b, double t);
  constexpr long double lerp(long double a, long double b, long double t);
 
  // classification / comparison functions
  int fpclassify(float x);
  int fpclassify(double x);
  int fpclassify(long double x);
 
  bool isfinite(float x);
  bool isfinite(double x);
  bool isfinite(long double x);
 
  bool isinf(float x);
  bool isinf(double x);
  bool isinf(long double x);
 
  bool isnan(float x);
  bool isnan(double x);
  bool isnan(long double x);
 
  bool isnormal(float x);
  bool isnormal(double x);
  bool isnormal(long double x);
 
  bool signbit(float x);
  bool signbit(double x);
  bool signbit(long double x);
 
  bool isgreater(float x, float y);
  bool isgreater(double x, double y);
  bool isgreater(long double x, long double y);
 
  bool isgreaterequal(float x, float y);
  bool isgreaterequal(double x, double y);
  bool isgreaterequal(long double x, long double y);
 
  bool isless(float x, float y);
  bool isless(double x, double y);
  bool isless(long double x, long double y);
 
  bool islessequal(float x, float y);
  bool islessequal(double x, double y);
  bool islessequal(long double x, long double y);
 
  bool islessgreater(float x, float y);
  bool islessgreater(double x, double y);
  bool islessgreater(long double x, long double y);
 
  bool isunordered(float x, float y);
  bool isunordered(double x, double y);
  bool isunordered(long double x, long double y);
 
  // mathematical special functions
 
  // associated Laguerre polynomials
  double       assoc_laguerre(unsigned n, unsigned m, double x);
  float        assoc_laguerref(unsigned n, unsigned m, float x);
  long double  assoc_laguerrel(unsigned n, unsigned m, long double x);
 
  // associated Legendre functions
  double       assoc_legendre(unsigned l, unsigned m, double x);
  float        assoc_legendref(unsigned l, unsigned m, float x);
  long double  assoc_legendrel(unsigned l, unsigned m, long double x);
 
  // beta function
  double       beta(double x, double y);
  float        betaf(float x, float y);
  long double  betal(long double x, long double y);
 
  // complete elliptic integral of the first kind
  double       comp_ellint_1(double k);
  float        comp_ellint_1f(float k);
  long double  comp_ellint_1l(long double k);
 
  // complete elliptic integral of the second kind
  double       comp_ellint_2(double k);
  float        comp_ellint_2f(float k);
  long double  comp_ellint_2l(long double k);
 
  // complete elliptic integral of the third kind
  double       comp_ellint_3(double k, double nu);
  float        comp_ellint_3f(float k, float nu);
  long double  comp_ellint_3l(long double k, long double nu);
 
  // regular modified cylindrical Bessel functions
  double       cyl_bessel_i(double nu, double x);
  float        cyl_bessel_if(float nu, float x);
  long double  cyl_bessel_il(long double nu, long double x);
 
  // cylindrical Bessel functions of the first kind
  double       cyl_bessel_j(double nu, double x);
  float        cyl_bessel_jf(float nu, float x);
  long double  cyl_bessel_jl(long double nu, long double x);
 
  // irregular modified cylindrical Bessel functions
  double       cyl_bessel_k(double nu, double x);
  float        cyl_bessel_kf(float nu, float x);
  long double  cyl_bessel_kl(long double nu, long double x);
 
  // cylindrical Neumann functions;
  // cylindrical Bessel functions of the second kind
  double       cyl_neumann(double nu, double x);
  float        cyl_neumannf(float nu, float x);
  long double  cyl_neumannl(long double nu, long double x);
 
  // incomplete elliptic integral of the first kind
  double       ellint_1(double k, double phi);
  float        ellint_1f(float k, float phi);
  long double  ellint_1l(long double k, long double phi);
 
  // incomplete elliptic integral of the second kind
  double       ellint_2(double k, double phi);
  float        ellint_2f(float k, float phi);
  long double  ellint_2l(long double k, long double phi);
 
  // incomplete elliptic integral of the third kind
  double       ellint_3(double k, double nu, double phi);
  float        ellint_3f(float k, float nu, float phi);
  long double  ellint_3l(long double k, long double nu, long double phi);
 
  // exponential integral
  double       expint(double x);
  float        expintf(float x);
  long double  expintl(long double x);
 
  // Hermite polynomials
  double       hermite(unsigned n, double x);
  float        hermitef(unsigned n, float x);
  long double  hermitel(unsigned n, long double x);
 
  // Laguerre polynomials
  double       laguerre(unsigned n, double x);
  float        laguerref(unsigned n, float x);
  long double  laguerrel(unsigned n, long double x);
 
  // Legendre polynomials
  double       legendre(unsigned l, double x);
  float        legendref(unsigned l, float x);
  long double  legendrel(unsigned l, long double x);
 
  // Riemann zeta function
  double       riemann_zeta(double x);
  float        riemann_zetaf(float x);
  long double  riemann_zetal(long double x);
 
  // spherical Bessel functions of the first kind
  double       sph_bessel(unsigned n, double x);
  float        sph_besself(unsigned n, float x);
  long double  sph_bessell(unsigned n, long double x);
 
  // spherical associated Legendre functions
  double       sph_legendre(unsigned l, unsigned m, double theta);
  float        sph_legendref(unsigned l, unsigned m, float theta);
  long double  sph_legendrel(unsigned l, unsigned m, long double theta);
 
  // spherical Neumann functions;
  // spherical Bessel functions of the second kind
  double       sph_neumann(unsigned n, double x);
  float        sph_neumannf(unsigned n, float x);
  long double  sph_neumannl(unsigned n, long double x);
}