[Question] collision detection between two car

i have problem with my project. i want to when the first car (player) hit car2, window will exit. this source:

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

float speed=0;
float xRot = 0, yRot = 0;
float screenLeft = -10;
float screenRight = 10;
float screenTop = 20;
float screenBottom = -15;

int screenWidth = 400; //pixel
int screenHeight = 650; //pixel

int red=255, green=255, blue=255;
float posisiX=0, posisiY=-12.5;

void grid()
{
float i;

glBegin(GL_LINES);
glLineWidth(1);
//Draw vertical row
for(i=screenLeft;i<=screenRight;i++)
{
glVertex2f(i, screenTop);
glVertex2f(i, screenBottom);
}

//draw horizontal row
for(i=screenBottom;i<=screenTop;i++)
{
glVertex2f(screenLeft, i);
glVertex2f(screenRight, i);
}

glLineWidth(3);
glColor3f(0.0,0.0,0.0);
glVertex2f(screenLeft,0);
glVertex2f(screenRight,0);
glVertex2f(0, screenBottom);
glVertex2f(0, screenTop);

glEnd();
}

void timer(int)
{
speed += 1;
// refresh display
glutPostRedisplay();
// set timer with  10 s
glutTimerFunc(10, timer, 0);
}


void square(){

glBegin(GL_POLYGON);
glColor3ub(255,255,255);
glVertex2f(-0.5,1.1);
glVertex2f(-0.5,0.1);
glVertex2f(0.5, 0.1);
glVertex2f(0.5,1.1);
glEnd();


glBegin(GL_POLYGON);
glColor3ub(0,0,0);
glVertex2f(-0.4,1);
glVertex2f(-0.4,0.2);
glVertex2f(0.4, 0.2);
glVertex2f(0.4,1);
glEnd();

}

void square1(){

glBegin(GL_POLYGON);
glColor3ub(255,255,255);
glVertex2f(-0.5,1.1);
glVertex2f(-0.5,0.1);
glVertex2f(0.5, 0.1);
glVertex2f(0.5,1.1);
glEnd();


glBegin(GL_POLYGON);
glColor3ub(255,0,0);
glVertex2f(-0.4,1);
glVertex2f(-0.4,0.2);
glVertex2f(0.4, 0.2);
glVertex2f(0.4,1);
glEnd();

}

void car3 (){
square1();
glPushMatrix();
glTranslatef(0,1.1, 0);
square1();
glPopMatrix();
glPushMatrix();
glTranslatef(0,-1.1, 0);
square1();
glPopMatrix();
glPushMatrix();
glTranslatef(-1.1,0, 0);
square1();
glPopMatrix();
glPushMatrix();
glTranslatef(1.1,0, 0);
square1();
glPopMatrix();
glPushMatrix();
glTranslatef(-1.1,-2.2, 0);
square1();
glPopMatrix();
glPushMatrix();
glTranslatef(1.1,-2.2, 0);
square1();
glPopMatrix();
}

void car (){
square();
glPushMatrix();
glTranslatef(0,1.1, 0);
square();
glPopMatrix();
glPushMatrix();
glTranslatef(0,-1.1, 0);
square();
glPopMatrix();
glPushMatrix();
glTranslatef(-1.1,0, 0);
square();
glPopMatrix();
glPushMatrix();
glTranslatef(1.1,0, 0);
square();
glPopMatrix();
glPushMatrix();
glTranslatef(-1.1,-2.2, 0);
square();
glPopMatrix();
glPushMatrix();
glTranslatef(1.1,-2.2, 0);
square();
glPopMatrix();
}

void car2(float x){
glPushMatrix();
if (x>0) {
glTranslatef(x-8 ,5, 0);
car(); }

glPopMatrix();
}

void baris(int n, float n1, int n2, int n3, int n4, int n5){
glPushMatrix();
glTranslated(0,n-8.5,0);
car2(n1*0.000001);
car2(n2*4);
car2(n3*8);
car2(n4*12);
car2(n5*16);
glPopMatrix();
}

void sirkuit(){
baris(1,0,0,0,0,0);
baris(6,0,0,0,0,0);
baris(11,0,0,0,0,0);
baris(16,0,0,0,0,0);
baris(21,0,0,0,0,0);
baris(26,0,0,0,1,0);
baris(31,0,0,0,0,0);
baris(36,0,1,1,0,1);
baris(41,0,0,0,0,0);
baris(46,0,0,0,0,0);
baris(51,0,0,1,1,1);
baris(56,0,1,1,0,0);
baris(61,0,0,0,0,0);
baris(66,1,0,1,0,1);
baris(71,0,0,0,0,0);
baris(76,0,0,0,0,0);
baris(81,0,1,1,1,1);
baris(86,0,0,0,0,0);
baris(91,0,0,0,0,0);
baris(96,1,1,0,1,1);
baris(101,0,0,0,0,0);
baris(106,0,0,1,0,0);
baris(111,0,0,0,0,0);
baris(116,0,1,1,1,1);
baris(121,0,0,0,0,0);
baris(126,1,0,0,0,0);
baris(131,0,0,0,0,0);
baris(136,0,1,0,1,1);
baris(141,0,0,0,0,0);
baris(146,0,0,0,0,0);
baris(151,1,0,1,0,1);
baris(156,0,0,0,0,0);
baris(161,0,0,0,0,0);
baris(165,1,0,1,1,1);
baris(166,0,0,0,0,0);
baris(171,0,0,0,0,0);
baris(176,1,1,1,0,1);
baris(181,0,0,0,0,0);
baris(186,0,0,0,0,0);
baris(191,0,1,1,1,0);
baris(196,0,0,0,0,0);
baris(201,0,0,0,0,0);
baris(206,0,0,1,1,1);
baris(211,0,0,0,0,0);
baris(216,0,0,0,0,0);
baris(221,1,0,1,1,1);
baris(226,0,0,0,0,0);
baris(231,0,0,0,0,0);
baris(236,0,1,1,0,1);
baris(241,0,0,0,0,0);
baris(246,0,0,0,0,0);
baris(251,1,1,0,1,0);
baris(256,0,0,0,0,0);
baris(261,0,0,0,0,0);
baris(266,1,0,1,0,1);
baris(271,0,0,0,0,0);
baris(276,0,0,0,0,0);
baris(281,0,1,0,1,1);
baris(286,0,0,0,0,0);
baris(291,0,0,0,0,0);
baris(296,1,0,1,1,0);
baris(301,0,0,0,0,0);
baris(306,0,0,0,0,0);
baris(311,0,1,1,0,1);
baris(316,0,0,0,0,0);
baris(321,0,0,0,0,0);
baris(326,0,1,1,1,0);
baris(331,0,0,0,0,0);
baris(336,0,0,0,0,0);
baris(341,1,1,1,0,0);
baris(346,0,0,0,0,0);
baris(351,0,0,0,0,0);
baris(356,1,1,0,1,1);
baris(361,0,0,0,0,0);
baris(366,0,0,0,0,0);
baris(371,0,1,1,1,1);
baris(376,0,0,0,0,0);
baris(381,0,0,0,0,0);
baris(386,1,1,1,0,1);
baris(391,0,0,0,0,0);
baris(396,0,0,0,0,0);
baris(401,1,0,1,1,1);
baris(406,0,0,0,0,0);
baris(411,0,0,0,0,0);
baris(416,1,1,0,1,1);
baris(421,0,0,0,0,0);
baris(426,0,0,0,0,0);
baris(431,0,1,1,1,0);
baris(436,0,0,0,0,0);
baris(441,0,0,0,0,0);
baris(446,1,1,0,1,1);
baris(451,0,0,0,0,0);
baris(456,0,0,0,0,0);
baris(461,1,0,1,1,0);
baris(466,0,0,0,0,0);
baris(471,0,0,0,0,0);
baris(476,1,1,1,0,1);
baris(481,0,0,0,0,0);
baris(486,0,0,0,1,0);
baris(491,0,1,0,0,1);
baris(496,0,0,0,0,0);
baris(501,0,0,0,0,0);
baris(506,0,1,1,0,1);
baris(511,0,0,0,0,0);
baris(516,0,0,0,0,0);
baris(521,0,1,1,1,0);
baris(526,0,0,0,0,0);
baris(531,0,0,0,0,0);
baris(536,1,1,1,0,0);
baris(541,0,0,0,0,0);
baris(546,0,0,0,0,0);
baris(551,1,1,0,1,1);
baris(556,0,0,0,0,0);
baris(561,0,0,0,0,0);
baris(566,0,1,1,1,1);
baris(571,0,0,0,0,0);
baris(576,0,0,0,0,0);
baris(581,1,1,1,0,1);
baris(586,0,0,0,0,0);
baris(591,0,0,0,0,0);
baris(596,1,0,1,1,1);
baris(601,0,0,0,0,0);
baris(606,0,0,0,0,0);
baris(611,1,1,0,1,1);
baris(616,0,0,0,0,0);
baris(621,0,0,0,0,0);
baris(626,0,1,1,1,0);
baris(631,0,0,0,0,0);
baris(636,0,0,0,0,0);
baris(641,1,1,0,1,1);
baris(646,0,0,0,0,0);
baris(651,0,0,0,0,0);
baris(656,1,0,1,1,0);
baris(661,0,0,0,0,0);
baris(666,0,0,0,0,0);
baris(671,1,1,1,0,1);
baris(676,0,0,0,0,0);
baris(681,0,0,0,1,0);
baris(686,0,1,0,0,1);
baris(691,0,0,0,0,0);
baris(696,0,0,0,0,0);
baris(701,1,0,1,1,1);
baris(706,0,0,0,0,0);
baris(711,0,0,0,0,0);
baris(716,1,1,0,1,1);
baris(721,0,0,0,0,0);
baris(726,0,0,0,0,0);
baris(731,0,1,1,1,0);
baris(736,0,0,0,0,0);
baris(741,0,0,0,0,0);
baris(746,1,1,0,1,1);
baris(751,0,0,0,0,0);
baris(756,0,0,0,0,0);
baris(761,1,0,1,1,0);
baris(766,0,0,0,0,0);
baris(771,0,0,0,0,0);
baris(776,1,1,1,0,1);
baris(781,0,0,0,0,0);
baris(786,0,0,0,1,0);
baris(791,0,1,0,0,1);
baris(796,0,0,0,0,0);
baris(801,0,0,0,0,0);
baris(806,0,1,1,0,1);
baris(811,0,0,0,0,0);
baris(816,0,0,0,0,0);
baris(821,0,1,1,1,0);
baris(826,0,0,0,0,0);
baris(831,0,0,0,0,0);
baris(836,1,1,1,0,0);
baris(841,0,0,0,0,0);
baris(846,0,0,0,0,0);
baris(851,1,1,0,1,1);
baris(856,0,0,0,0,0);
baris(861,0,0,0,0,0);
baris(866,0,1,1,1,1);
baris(871,0,0,0,0,0);
baris(876,0,0,0,0,0);
baris(881,1,1,1,0,1);
baris(886,0,0,0,0,0);
baris(891,0,0,0,0,0);
baris(896,1,0,1,1,1);
baris(901,0,0,0,0,0);
baris(906,0,0,0,0,0);
baris(911,1,1,0,1,1);
baris(916,0,0,0,0,0);
baris(921,0,0,0,0,0);
baris(926,0,1,1,1,0);
baris(931,0,0,0,0,0);
baris(936,0,0,0,0,0);
baris(941,1,1,0,1,1);
baris(946,0,0,0,0,0);
baris(951,0,0,0,0,0);
baris(956,1,0,1,1,0);
baris(961,0,0,0,0,0);
baris(966,0,0,0,0,0);
baris(971,1,1,1,0,1);
baris(976,0,0,0,0,0);
baris(981,0,0,0,1,0);
baris(986,0,1,0,0,1);
baris(991,0,0,0,0,0);
baris(996,0,0,0,0,0);
baris(1001,1,1,0,1,1);
}


void processNormalKeys(unsigned char key, int x, int y) {


}

void processSpecialKeys(int key, int x, int y) {
switch(key) {


case GLUT_KEY_UP:
yRot-=0.9;
break;
/*
case GLUT_KEY_DOWN: if (posisiY<=screenBottom) {posisiY=screenBottom+7.5;}
posisiY-=5;
*/
break;
case GLUT_KEY_RIGHT:
posisiX+=4; if (posisiX>=screenRight) {posisiX=screenRight-2;}
break;
case GLUT_KEY_LEFT:
posisiX-=4; if (posisiX<=screenLeft) {posisiX=screenLeft+2;}
break;

}
}


void init() {
glClearColor(0.5, 0.5, 0.5, 1.0);

glMatrixMode(GL_PROJECTION);
glLoadIdentity();
gluOrtho2D(screenLeft, screenRight, screenBottom, screenTop);
glMatrixMode(GL_MODELVIEW);
}


void display()
{
glClear( GL_COLOR_BUFFER_BIT);

glColor3ub(25,25,25);
//grid();

glPushMatrix();
glTranslated(0,yRot,0);
sirkuit();
glPopMatrix();

glColor3ub(red, green, blue);
glPushMatrix();
glTranslatef(posisiX, posisiY, 0);
car3();
glPopMatrix();

yRot-=0.1;

glutSwapBuffers();
glFlush();
}

int main(int argc, char **argv) {
glutInit(&argc, argv);
glutInitWindowSize(screenWidth, screenHeight);
glutInitDisplayMode(GLUT_DOUBLE);
glutInitWindowPosition(500, 50);
glutCreateWindow("MisiRace");

glutDisplayFunc(display);
//glutIdleFunc(display);
timer(10);

glutKeyboardFunc(processNormalKeys);
glutSpecialFunc(processSpecialKeys);
init();

glutMainLoop();

return 0;
}