hypot, hypotl

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math.h

Category

Math Routines

Prototype

double hypot(double x, double y);

long double hypotl(long double x, long double y);

Description

Calculates hypotenuse of a right triangle.

hypot calculates the value z where

z2 = x2 + y2 and z >= 0

This is equivalent to the length of the hypotenuse of a right triangle, if the lengths of the two sides are x and y.

hypotl is the long double version; it takes long double arguments and returns a long double result.

Return Value

On success, these functions return z, a double (hypot) or a long double) (hypotl). On error (such as an overflow), they set the global variable errno to

 ERANGE Result out of range

and return the value HUGE_VAL (hypot) or _LHUGE_VAL) (hypotl). Error handling for these routines can be modified through the functions _matherr and _matherrl.

Example

#include <stdio.h>
#include <math.h>
int main(void)
{
double result;
double x = 3.0;
double y = 4.0;
result = hypot(x, y);
printf("The hypotenuse is: %lf\n", result);
return 0;
}

Portability

POSIX Win32 ANSI C ANSI C++

hypot

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hypotl

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