std::sqrt,std::sqrtf,std::sqrtl (3) - Linux Man Pages
Defined in header <cmath>
float sqrt ( float arg );
float sqrtf( float arg ); (since C++11)
double sqrt ( double arg ); (1) (2)
long double sqrt ( long double arg );
long double sqrtl( long double arg ); (3) (since C++11)
double sqrt ( IntegralType arg ); (4) (since C++11)
1-3) Computes the square root of arg.
4) A set of overloads or a function template accepting an argument of any integral_type. Equivalent to 2) (the argument is cast to double).
arg - Value of a floating-point or Integral_type
If no errors occur, square root of arg (
arg), is returned.
If a domain error occurs, an implementation-defined value is returned (NaN where supported)
If a range error occurs due to underflow, the correct result (after rounding) is returned.
Errors are reported as specified in math_errhandling
Domain error occurs if arg is less than zero.
If the implementation supports IEEE floating-point arithmetic (IEC 60559),
* If the argument is less than -0, FE_INVALID is raised and NaN is returned.
* If the argument is +∞ or ±0, it is returned, unmodified.
* If the argument is NaN, NaN is returned
std::sqrt is required by the IEEE standard to be exact. The only other operations required to be exact are the arithmetic_operators and the function std::fma. After rounding to the return type (using default rounding mode), the result of std::sqrt is indistinguishable from the infinitely precise result. In other words, the error is less than 0.5 ulp. Other functions, including std::pow, are not so constrained.
// Run this code
powl raises a number to the given power (xy)
cbrt computes cubic root (
hypot computes square root of the sum of the squares of two given numbers (
sqrt(std::complex) (function template)
sqrt(std::valarray) (function template)