TheAlgorithms-C/misc/cartesian_to_polar.c

63 lines
1.3 KiB
C

#include <math.h>
#include <stdio.h>
const double pi = 3.141592653589793238462643383279502884;
/**
give as arguments to the executable two x and y coordinates
outputs a polar coordinate
**/
int main()
{
double x, y;
double r, theta, thetaFinal;
scanf("%lf %lf", &x, &y);
r = hypot(x, y);
if (x != 0)
{
if (y != 0)
{
theta = atan(y / x);
if ((x > 0 && y > 0) || (x == -y))
{ // Q1
thetaFinal = theta;
}
else if (x < 0 && y > 0)
{ // Q2
thetaFinal = theta + pi;
}
else if (x < 0 && y < 0)
{ // Q3
thetaFinal = theta - pi;
}
else if (x > 0 && y < 0)
{ // Q4
thetaFinal = 2 * pi - theta;
}
}
}
if (x == 0)
{ // exceptions when no actual angle is present
if (y > 0)
{
thetaFinal = pi / 2;
}
else
{
thetaFinal = -(pi / 2);
}
}
if (y == 0)
{
if (x > 0)
{
thetaFinal = 0;
}
else
{
thetaFinal = -pi;
}
}
printf("%.2f %.2f\n", r, atan2(y, x));
}