计算机图形学，用鼠标事件画多边形错误C2146

以下两行显示错误C2146，求解。
   p=p+2n;
   q=q+2n; #include<glut.h>
 #include<gl.h>
 int x=200,y=100;
 int Point0[2]={200,100};
 int Point1[2];
 int Point2[2];
 int Point3[2];
 void mouse(GLint button, GLint state,int a,int b)
 {
  int array[8];
  int p=0,q=1;
  int n=1;
  for(n;n<6;n++)
  {
  if(button==GLUT_RIGHT_BUTTON && state==GLUT_DOWN)
     exit(0);
  if(button==GLUT_LEFT_BUTTON && state==GLUT_DOWN)
  {
  array[p]=a;
      array[q]=b;
  Point0[0]=x;
  Point0[1]=y;
  x=array[p];
  y=array[q];
  Point1[0]=array[2];
  Point1[1]=array[3];
  Point2[0]=array[4];
  Point2[1]=array[5];
  Point3[0]=array[6];
  Point3[1]=array[7];
  p=p+2n;
  q=q+2n;
  }
  }
     GLint Point[2]={x,y}; //设置初始顶点
  glClear(GL_COLOR_BUFFER_BIT);
  glColor3f(1.0,1.0,0.0);         //设置画线的颜色为黄色
  glBegin(GL_LINE_STRIP); //连点成线
  glVertex2iv(Point0);   
  glVertex2iv(Point); 
  glVertex2iv(Point1); 
  glVertex2iv(Point2); 
  glVertex2iv(Point3); 
  glEnd();
  glutSwapBuffers();
 }
 
 void display(void)
 {
  glutMouseFunc(mouse);
 }
 
 void main(int argc,char** argv)
 {
  glutInit(&argc, argv);
  glutInitDisplayMode (GLUT_DOUBLE | GLUT_RGB);
  glutInitWindowSize(600, 600);          //窗口大小
  glutInitWindowPosition(400,100);          //窗口位置
  glutCreateWindow("扫描线填充算法示例 学号102370");          //窗口名称
  glClearColor(0.0,0.1,0.6,0.0);          //背景颜色设为蓝色
  gluOrtho2D(0.0,600.0,600.0,0.0);
  glutDisplayFunc(display);
  glutMainLoop();
 }