Difference between revisions of "cpp/numeric/math/hypot"
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Revision as of 22:17, 31 May 2013
| Defined in header <cmath>
|
||
| float hypot( float x, float y ); |
(1) | (since C++11) |
| double hypot( double x, double y ); |
(2) | (since C++11) |
| long double hypot( long double x, long double y ); |
(3) | (since C++11) |
| Promoted hypot( Arithmetic x, Arithmetic y ); |
(4) | (since C++11) |
Computes the square root of the sum of the squares of x and y, without undue overflow or underflow at intermediate stages of the computation. This is the length of the hypotenuse of a right-angled triangle with sides of length x and y, or the distance of the point (x,y) from the origin (0,0), or the magnitude of a complex number x+iy
4) If any argument has integral type, it is cast to double. If any other argument is long double, then the return type is long double, otherwise it is double.
Contents |
Parameters
| x | - | floating point value |
| y | - | floating point value |
Return value
The hypotenuse of a right-angled triangle, √x2+y2.
Exceptions
If the result overflows, a range error may occur and FE_OVERFLOW may be raised.
If the result is subnormal, an underflow error may occur and FE_UNDERFLOW may be raised.
Notes
Implementations usually guarantee precision of less than 1 ulp (units in the last place): GNU, BSD, Open64
Example
#include <cmath> #include <utility> #include <iostream> std::pair<double, double> cartesian_to_polar(double x, double y) { return {std::hypot(x, y), std::atan2(y,x)}; } int main() { std::pair<double, double> polar = cartesian_to_polar(1, 1); std::cout << "(1,1) cartesian is (" << polar.first << "," << polar.second<< ") polar\n"; }
Output:
(1,1) cartesian is (1.41421,0.785398) polar
See also
| (C++11)(C++11) |
computes square root (√x) (function) |
| (C++11)(C++11) |
raises a number to the given power (xy) (function) |
| returns the magnitude of a complex number (function template) |
