hypot, hypotl

Remonter à Math.h - Index

Header File

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		+	+	+
hypotl		+	+	+