hypot, hypotf, hypotl - Euclidean distance

Definition	#include <math.h> double hypot(double x, double y); float hypotf(float x, float y); (C11) long double hypotl(long double x, long double y); (C11) These functions calculate the euclidean distance of the point with the coordinates (x,y).
Return val.	sqrt(x*x + y*y)	square root of the sum of the squared coordinates.
	HUGE_VAL HUGE_VALF   HUGE_VALL	depending on the function type,in the event of an overflow. In addition, errno is set to ERANGE (result too large).
Example	#include <stdio.h> #include <math.h> #include <stdlib.h> int main(void) { double x, y, alpha, r, pi; printf("Enter x and y coordinates:\n"); scanf("%lf %lf", &x, &y); pi = 2.0 * asin(1.0); if(x > 0.0) alpha = atan(y/x); else if (x < 0.0) if (y >= 0.0) alpha = atan(y/x) + pi; else alpha = atan(y/x) - pi; else if (y > 0) alpha = pi/2.0; else if (y < 0) alpha = -pi/2.0; else { printf("Angle not defined!\n"); exit(1); } r = hypot(x, y); alpha = alpha * (180.0/pi); printf("The polar coordinates are:\n");  printf("Distance from zero: %g\n",r);  printf("Angle to the x axis:\n");  printf("%g degrees\n",((y < 0.0)? alpha + 360 : alpha) );  return 0; }
See also	cabs, sqrt