功 能: 计算直角三角形的斜边长

用 法: double hypot(double x, double y);

程序例:

#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\", result);

return 0;

}