OpenGl code for collision detection between two objects

This source code is for making two balls which can move each other. when balls collide each other than will move in opposite directions.

OpenGL program:

#ifdef __APPLE__
#include<GLUT/glut.h>
#include<openGL/openGL.h>

#else
#include<GL/glut.h>
#endif

float x1=-2.0,x2=2.0;
static int flag=1;
void initRendering()
{
    glEnable(GL_DEPTH_TEST);
}

void reshape(int w,int h)
{
    glViewport(0,0,w,h);

    glMatrixMode(GL_PROJECTION);

    glLoadIdentity();

    gluPerspective(45,w/h,1,200);

}

void keyPressed(int key,int x,int y)
{
    if(key==GLUT_KEY_LEFT)
    {}
}

void drawBall1()
{
    glColor3f(1.0,0.0,0.0);

    glPushMatrix();

    glTranslatef(x1,0.0,-5.0);

    glutSolidSphere(0.4,20,20);

    glPopMatrix();

}

void drawBall2()
{
    glColor3f(0.0,0.0,1.0);

    glPushMatrix();

    glTranslatef(x2,0.0,-5.0);

    glutSolidSphere(0.4,20,20);

    glPopMatrix();

}

void update()
{
    if(flag)
        {
            x1+=0.005;
            x2-=0.005;
            if(x1>-0.35)
                flag=0;
        }
    if(!flag)
    {
        x1-=0.005;
        x2+=0.005;
        if(x1<-2.0)
            flag=1;
    }
}
void display()
{
    glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);

    glMatrixMode(GL_MODELVIEW);

    glLoadIdentity();

    //glShadeModel(GL_SMOOTH);
    drawBall1();

    drawBall2();

    update();

    glutSwapBuffers();
}


int main(int argc,char **argv)
{
    glutInit(&argc,argv);

    glutInitDisplayMode(GLUT_DOUBLE|GLUT_RGB|GLUT_DEPTH);

    glutInitWindowSize(400,400);

    glutCreateWindow("Collision Window");

    initRendering();

    glutDisplayFunc(display);

    glutIdleFunc(display);

    glutReshapeFunc(reshape);

    glutSpecialFunc(keyPressed);

    glutMainLoop();

    return(0);
}

//Output of the above Program:-

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