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C++ Math Functions


C++ Math Functions

The <cmath> library has many functions that allow you to perform mathematical tasks on numbers.

A list of all math functions can be found in the table below:

Function Description
abs(x) Returns the absolute value of x
acos(x) Returns the arccosine of x, in radians
acosh(x) Returns the hyperbolic arccosine of x
asin(x) Returns the arcsine of x, in radians
asinh(x) Returns the hyperbolic arcsine of x
atan(x) Returns the arctangent of x as a numeric value between -PI/2 and PI/2 radians
atan2(y, x) Returns the angle theta from the conversion of rectangular coordinates (x, y) to polar coordinates (r, theta)
atanh(x) Returns the hyperbolic arctangent of x
cbrt(x) Returns the cube root of x
ceil(x) Returns the value of x rounded up to its nearest integer
copysign(x, y) Returns the first floating point x with the sign of the second floating point y
cos(x) Returns the cosine of x (x is in radians)
cosh(x) Returns the hyperbolic cosine of x
exp(x) Returns the value of Ex
exp2(x) Returns the value of 2x
expm1(x) Returns ex-1
erf(x) Returns the value of the error function at x
erfc(x) Returns the value of the complementary error function at x
fabs(x) Returns the absolute value of a floating x
fdim(x) Returns the positive difference between x and y
floor(x) Returns the value of x rounded down to its nearest integer
fma(x, y, z) Returns x*y+z without losing precision
fmax(x, y) Returns the highest value of a floating x and y
fmin(x, y) Returns the lowest value of a floating x and y
fmod(x, y) Returns the floating point remainder of x/y
frexp(x, y) With x expressed as m*2n, returns the value of m (a value between 0.5 and 1.0) and writes the value of n to the memory at the pointer y
hypot(x, y) Returns sqrt(x2 +y2) without intermediate overflow or underflow
ilogb(x) Returns the integer part of the floating-point base logarithm of x
ldexp(x, y) Returns x*2y
lgamma(x) Returns the logarithm of the absolute value of the gamma function at x
llrint(x) Rounds x to a nearby integer and returns the result as a long long integer
llround(x) Rounds x to the nearest integer and returns the result as a long long integer
log(x) Returns the natural logarithm of x
log10(x) Returns the base 10 logarithm of x
log1p(x) Returns the natural logarithm of x+1
log2(x) Returns the base 2 logarithm of the absolute value of x
logb(x) Returns the floating-point base logarithm of the absolute value of x
lrint(x) Rounds x to a nearby integer and returns the result as a long integer
lround(x) Rounds x to the nearest integer and returns the result as a long integer
modf(x, y) Returns the decimal part of x and writes the integer part to the memory at the pointer y
nan(s) Returns a NaN (Not a Number) value
nearbyint(x) Returns x rounded to a nearby integer
nextafter(x, y) Returns the closest floating point number to x in the direction of y
nexttoward(x, y) Returns the closest floating point number to x in the direction of y
pow(x, y) Returns the value of x to the power of y
remainder(x, y) Return the remainder of x/y rounded to the nearest integer
remquo(x, y, z) Calculates x/y rounded to the nearest integer, writes the result to the memory at the pointer z and returns the remainder.
rint(x) Returns x rounded to a nearby integer
round(x) Returns x rounded to the nearest integer
scalbln(x, y) Returns x*Ry (R is usually 2)
scalbn(x, y) Returns x*Ry (R is usually 2)
sin(x) Returns the sine of x (x is in radians)
sinh(x) Returns the hyperbolic sine of x
sqrt(x) Returns the square root of x
tan(x) Returns the tangent of x (x is in radians)
tanh(x) Returns the hyperbolic tangent of x
tgamma(x) Returns the value of the gamma function at x
trunc(x) Returns the integer part of x

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