Using glPushMatrix and glPopMatrix

//http://www.youtube.com/user/thecplusplusguy
//use glPush/popMatrix with (old) OpenGL 1.1
#include <iostream>
#include <SDL/SDL.h>
#include <GL/gl.h>
#include <GL/glu.h>



void init()
{
    glClearColor(0,0,0,1);
    glMatrixMode(GL_PROJECTION);
        glLoadIdentity();
        gluPerspective(50,640.0/480.0,1,1000);
    glMatrixMode(GL_MODELVIEW);
    glEnable(GL_DEPTH_TEST);


}

void drawTriangle()
{
    glBegin(GL_TRIANGLES);
        glVertex3f(-1.0,0.0,0.0);
        glVertex3f(1.0,0.0,0.0);
        glVertex3f(0.0,1.0,0.0);
    glEnd();

}

float angle=0.0;

void display()
{
    glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);

    glLoadIdentity();

    glPushMatrix();
    glTranslatef(-5.0,0.0,-14.0);
    drawTriangle();
    glPopMatrix();


    glPushMatrix();
    glTranslatef(0.0,0.0,-14.0);
    glRotatef(angle,0.0,1.0,0.0);
    drawTriangle();
    glPopMatrix();


    glPushMatrix();
    glTranslatef(5.0,0.0,-14.0);
    drawTriangle();
    glPopMatrix();

    angle+=1.0;
    if(angle>=360.0)
        angle-=360;
}



int main()
{
    SDL_Init(SDL_INIT_EVERYTHING);
    SDL_SetVideoMode(640,480,32,SDL_OPENGL);
    Uint32 start;
    SDL_Event event;
    bool running=true;
    init();
    bool b=false;
    while(running)
    {
        start=SDL_GetTicks();
        while(SDL_PollEvent(&event))
        {
            switch(event.type)
            {
                case SDL_QUIT:
                    running=false;
                    break;
                case SDL_KEYDOWN:
                    switch(event.key.keysym.sym)
                    {
                        case SDLK_ESCAPE:
                            running=false;
                            break;
                    }
                    break;

            }
        }
        display();
        SDL_GL_SwapBuffers();
        if(1000.0/30>SDL_GetTicks()-start)
            SDL_Delay(1000.0/30-(SDL_GetTicks()-start));
    }
    SDL_Quit();
}