This header file declares basic mathematics constants and functions.
libm.a. See also the related FAQ entry.errno variable. Therefore the majority of them are declared with const attribute, for better optimization by GCC. INFINITY constant.
The constant 1/pi.
The constant 2/pi.
The constant 2/sqrt(pi).
The constant e.
The natural logarithm of the 10.
The natural logarithm of the 2.
The logarithm of the e to base 10.
The logarithm of the e to base 2.
The constant pi.
The constant pi/2.
The constant pi/4.
The constant 1/sqrt(2).
The square root of 2.
NAN constant.
The alias for acosf().
The acosf() function computes the principal value of the arc cosine of __x. The returned value is in the range [0, pi] radians. A domain error occurs for arguments not in the range [-1, +1].
The alias for asinf().
The asinf() function computes the principal value of the arc sine of __x. The returned value is in the range [-pi/2, pi/2] radians. A domain error occurs for arguments not in the range [-1, +1].
The alias for atanf().
The alias for atan2f().
The atan2f() function computes the principal value of the arc tangent of __y / __x, using the signs of both arguments to determine the quadrant of the return value. The returned value is in the range [-pi, +pi] radians.
The atanf() function computes the principal value of the arc tangent of __x. The returned value is in the range [-pi/2, pi/2] radians.
The alias for cbrtf().
The cbrt() function returns the cube root of __x.
The alias for ceilf().
The ceilf() function returns the smallest integral value greater than or equal to __x, expressed as a floating-point number.
The copysignf() function returns __x but with the sign of __y. They work even if __x or __y are NaN or zero.
The alias for cosf().
The cosf() function returns the cosine of __x, measured in radians.
The alias for coshf().
The coshf() function returns the hyperbolic cosine of __x.
The alias for expf().
The expf() function returns the exponential value of __x.
The fabsf() function computes the absolute value of a floating-point number __x.
The alias for fdimf().
The fdimf() function returns maxf(__x - __y, 0). If __x or __y or both are NaN, NaN is returned.
The alias for floorf().
The floorf() function returns the largest integral value less than or equal to __x, expressed as a floating-point number.
The alias for fmaf().
The fmaf() function performs floating-point multiply-add. This is the operation (__x * __y) + __z, but the intermediate result is not rounded to the destination type. This can sometimes improve the precision of a calculation.
The alias for fmaxf().
The fmaxf() function returns the greater of the two values __x and __y. If an argument is NaN, the other argument is returned. If both arguments are NaN, NaN is returned.
The alias for fminf().
The fminf() function returns the lesser of the two values __x and __y. If an argument is NaN, the other argument is returned. If both arguments are NaN, NaN is returned.
The alias for fmodf().
The function fmodf() returns the floating-point remainder of __x / __y.
The alias for frexpf().
The frexpf() function breaks a floating-point number into a normalized fraction and an integral power of 2. It stores the integer in the int object pointed to by __pexp.
If __x is a normal float point number, the frexpf() function returns the value v, such that v has a magnitude in the interval [1/2, 1) or zero, and __x equals v times 2 raised to the power __pexp. If __x is zero, both parts of the result are zero. If __x is not a finite number, the frexpf() returns __x as is and stores 0 by __pexp.
The alias for hypotf().
The hypotf() function returns sqrtf(__x*__x + __y*__y). This is the length of the hypotenuse of a right triangle with sides of length __x and __y, or the distance of the point (__x, __y) from the origin. Using this function instead of the direct formula is wise, since the error is much smaller. No underflow with small __x and __y. No overflow if result is in range.
The isfinitef() function returns a nonzero value if __x is finite: not plus or minus infinity, and not NaN.
The alias for isinff().
The function isinff() returns 1 if the argument __x is positive infinity, -1 if __x is negative infinity, and 0 otherwise.
The alias for isnanf().
The function isnanf() returns 1 if the argument __x represents a "not-a-number" (NaN) object, otherwise 0.
The alias for ldexpf().
The ldexpf() function multiplies a floating-point number by an integral power of 2. It returns the value of __x times 2 raised to the power __exp.
The alias for logf().
The alias for log10f().
The log10f() function returns the logarithm of argument __x to base 10.
The logf() function returns the natural logarithm of argument __x.
The alias for lrintf().
The lrintf() function rounds __x to the nearest integer, rounding the halfway cases to the even integer direction. (That is both 1.5 and 2.5 values are rounded to 2). This function is similar to rintf() function, but it differs in type of return value and in that an overflow is possible.
LONG_MIN value (0x80000000). The alias for lroundf().
The lroundf() function rounds __x to the nearest integer, but rounds halfway cases away from zero (instead of to the nearest even integer). This function is similar to roundf() function, but it differs in type of return value and in that an overflow is possible.
LONG_MIN value (0x80000000). An alias for modff().
The modff() function breaks the argument __x into integral and fractional parts, each of which has the same sign as the argument. It stores the integral part as a double in the object pointed to by __iptr.
The modff() function returns the signed fractional part of __x.
The alias for powf().
The function powf() returns the value of __x to the exponent __y.
The alias for roundf().
The roundf() function rounds __x to the nearest integer, but rounds halfway cases away from zero (instead of to the nearest even integer). Overflow is impossible.
NaN, then NaN is returned. The alias for signbitf().
The signbitf() function returns a nonzero value if the value of __x has its sign bit set. This is not the same as `__x < 0.0', because IEEE 754 floating point allows zero to be signed. The comparison `-0.0 < 0.0' is false, but `signbit (-0.0)' will return a nonzero value.
The alias for sinf().
The sinf() function returns the sine of __x, measured in radians.
The alias for sinhf().
The sinhf() function returns the hyperbolic sine of __x.
An alias for sqrtf().
The sqrtf() function returns the non-negative square root of __x.
The alias for squaref().
The function squaref() returns __x * __x.
The alias for tanf().
The tanf() function returns the tangent of __x, measured in radians.
The alias for tanhf().
The tanhf() function returns the hyperbolic tangent of __x.
The alias for truncf().
The truncf() function rounds __x to the nearest integer not larger in absolute value.