##### Synopsis

    #include <math.h>
    float hypotf(float x, float y);

##### Description

hypotf compute the square root of the sum of the squares of x and y, sqrtf(x*x + y*y), without undue overflow or underflow. If x and y are the lengths of the sides of a right-angled triangle, then hypotf computes the length of the hypotenuse..

##### IEC 60559 math library behavior

If x or y is +? or -?, hypotf returns ?.
If x or y is NaN, hypotf returns NaN.

##### Portability

hypotf conforms to ISO/IEC 9899:1999 (C99).