Trig_Blog_Sample_1

#include <math.h>
#include <cstdio>

int main()
{
    struct point
    {
        float x_pos;
        float y_pos;
    };

    point points[8];
    points[0].x_pos = -200.0f;
    points[0].y_pos = -200.0f;
    points[1].x_pos = 0.0f;
    points[1].y_pos = -200.0f;
    points[2].x_pos = 200.0f;
    points[2].y_pos = -200.0f;
    points[3].x_pos = 200.0f;
    points[3].y_pos = 0.0f;
    points[4].x_pos = 200.0f;
    points[4].y_pos = 200.0f;
    points[5].x_pos = 0.0f;
    points[5].y_pos = 200.0f;
    points[6].x_pos = -200.0f;
    points[6].y_pos = 200.0f;
    points[7].x_pos = -200.0f;
    points[7].y_pos = 0.0f;

    float store_atan[8];
    float store_atan2f[8];

    int i;
    for(i = 0; i < 8; i++)
    {
        store_atan[i] = atanf(points[i].y_pos / points[i].x_pos);
        store_atan2f[i] = atan2f(points[i].y_pos, points[i].x_pos);
    }

    for(i = 0; i < 8; i++)
    {
        printf("store_atan[%d]   = %.4f\n", i, store_atan[i]);
        printf("store_atan2f[%d] = %.4f\n\n", i, store_atan2f[i]);
    }

    return 0;
}