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hypot, hypotl

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

Copy Code

    #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 |  | + | + | +

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