C++ offers some basic math functions and the required header file to use these functions is <math.h>
Trignometric functions
| Method |
Description |
| cos(x) |
It computes the cosine of x. |
| sin(x) |
It computes the sine of x. |
| tan(x) |
It computes the tangent of x. |
| acos(x) |
It finds the inverse cosine of x. |
| asin(x) |
It finds the inverse sine of x. |
| atan(x) |
It finds the inverse tangent of x. |
| atan2(x,y) |
It finds the inverse tangent of a coordinate x and y. |
Hyperbolic functions
| Method |
Description |
| cosh(x) |
It computes the hyperbolic cosine of x. |
| sinh(x) |
It computes the hyperbolic sine of x. |
| tanh(x) |
It computes the hyperbolic tangent of x. |
| acosh(x) |
It finds the arc hyperbolic cosine of x. |
| asinh(x) |
It finds the arc hyperbolic sine of x. |
| atanh(x) |
It finds the arc hyperbolic tangent of x. |
Exponential functions
| Method |
Description |
| exp(x) |
It computes the exponential e raised to the power x. |
| frexp(value_type x,int* exp) |
It breaks a number into significand and 2 raised to the power exponent. |
| Idexp(float x, int e) |
It computes the product of x and 2 raised to the power e. |
| log(x) |
It computes the natural logarithm of x. |
| log10(x) |
It computes the common logarithm of x. |
| modf() |
It breaks a number into an integer and fractional part. |
| exp2(x) |
It computes the base 2 exponential of x. |
| expm1(x) |
It computes the exponential raised to the power x minus one. |
| log1p(x) |
It computes the natural logarithm of x plus one. |
| log2(x) |
It computes the base 2 logarithm of x. |
| logb(x) |
It computes the logarithm of x. |
| scalbn( x, n) |
It computes the product of x and FLT_RADX raised to the power n. |
| scalbln( x, n) |
It computes the product of x and FLT_RADX raised to the power n. |
| ilogb(x) |
It returns the exponent part of x. |
Floating point manipulation functions
| Method |
Description |
| copysign(x,y) |
It returns the magnitude of x with the sign of y. |
| nextafter(x,y) |
It represents the next representable value of x in the direction of y. |
| nexttoward(x,y) |
It represents the next representable value of x in the direction of y. |
Maximum,Minimum and Difference functions
| Method |
Description |
| fdim(x,y) |
It calculates the positive difference between x and y. |
| fmax(x,y) |
It returns the larger number among two numbers x and y. |
| fmin() |
It returns the smaller number among two numbers x and y . |
Power functions
| Method |
Description |
| pow(x,y) |
It computes x raised to the power y. |
| sqrt(x) |
It computes the square root of x. |
| cbrt(x) |
It computes the cube root of x. |
| hypot(x,y) |
It finds the hypotenuse of a right angled triangle. |
Nearest integer operations
| Method |
Description |
| ceil(x) |
It rounds up the value of x. |
| floor(x) |
It rounds down the value of x. |
| round(x) |
It rounds off the value of x. |
| lround(x) |
It rounds off the value of x and cast to long integer. |
| llround(x) |
It rounds off the value of x and cast to long long integer. |
| fmod(n,d) |
It computes the remainder of division n/d. |
| trunc(x) |
It rounds off the value x towards zero. |
| rint(x) |
It rounds off the value of x using rounding mode. |
| lrint(x) |
It rounds off the value of x using rounding mode and cast to long integer. |
| llrint(x) |
It rounds off the value x and cast to long long integer. |
| nearbyint(x) |
It rounds off the value x to a nearby integral value. |
| remainder(n,d) |
It computes the remainder of n/d. |
| remquo() |
It computes remainder and quotient both. |
Other functions
| Method |
Description |
| fabs(x) |
It computes the absolute value of x. |
| abs(x) |
It computes the absolute value of x. |
| fma(x,y,z) |
It computes the expression x*y+z. |
Macro functions
| Method |
Description |
| fpclassify(x) |
It returns the value of type that matches one of the macro constants. |
| isfinite(x) |
It checks whether x is finite or not. |
| isinf() |
It checks whether x is infinite or not. |
| isnan() |
It checks whether x is nan or not. |
| isnormal(x) |
It checks whether x is normal or not. |
| signbit(x) |
It checks whether the sign of x is negative or not. |
Comparison macro functions
Error and gamma functions
| Method |
Description |
| erf(x) |
It computes the error function value of x. |
| erfc(x) |
It computes the complementary error function value of x. |
| tgamma(x) |
It computes the gamma function value of x. |
| lgamma(x) |
It computes the logarithm of a gamma function of x. |
