#include <GL/glut.h>
#include <math.h>

float x;
float y;

void display()
{
  glClear(GL_COLOR_BUFFER_BIT);
  glScalef(1/3.14, 1/3.14, 1.0);
  glBegin(GL_LINE_STRIP);
  for(x=-3.14;x<=3.14;x+=0.6)
  {
    y=sin(x);
    glVertex2f(x, y);
  }
  glEnd();
  glFlush();
}


int main(int argc, char *argv[])
{
  glutInit(&argc,argv);
  glutInitDisplayMode(GLUT_SINGLE | GLUT_RGB);
  glutCreateWindow("C GLUT program");
  glutDisplayFunc(display);
  glutMainLoop();
  return 0;
}