1.
-------------------------------------------------------------------------
import flash.events.KeyboardEvent;
import flash.events.MouseEvent;
import flash.display.MovieClip;

 var left = false;
 var right = false;
 var up = false;
 var down = false;
var friction:Number = 0.95
 var speed:Number = 0;
var acceleration:Number = 0.2;
// var maxSpeed:Number = 20;
 //var maxReverse:Number = -8;
 var rot;

Mouse.hide()

stage.addEventListener(Event.ENTER_FRAME, main);
stage.addEventListener(MouseEvent.MOUSE_MOVE,topMove)
     
function tank()
{
stage.addEventListener(KeyboardEvent.KEY_DOWN, KeyDown);
stage.addEventListener(KeyboardEvent.KEY_UP, KeyUp);

}


function KeyDown(event:KeyboardEvent)
{
switch(event.keyCode )
{
case 37:
left = true;
break;
case 38:
up = true;
break;
case 39:
right = true;
break;
case 40:
down = true;
break;
/*default :
trace("wrong key");*/
}
}

function KeyUp(event:KeyboardEvent)
{
switch(event.keyCode )
{
case 37:
left = false;
break;
case 38:
up = false;
break;
    case 39:
right = false;
break;
case 40:
down = false;
break;
/*default :
trace("wrong key");*/
}
}



function main(even:Event):void
{
if (left)
{
body.rotation -= 2;

}
if (right)
{
body.rotation += 2;
}
if (up)
{
speed += acceleration;
}
if (down)
{
speed -= acceleration;
}

/*if (speed > maxSpeed)
{
speed = maxSpeed;
}
if (speed < acceleration && speed > -acceleration)
{
speed = 0;
}
else if ( speed < maxReverse)
{
speed = maxReverse;
}*/



var direction:Number = body.rotation * Math.PI / 180
var xSpeed:Number = -Math.sin(direction) * speed;
var ySpeed:Number = Math.cos(direction) * speed;

body.x -= xSpeed;
body.y -= ySpeed;
speed = speed * friction;

top.x=body.x;
top.y=body.y;
top.rotation=rot;

mc.x=mouseX;
mc.y=mouseY;
}

 function topMove(event:MouseEvent)
 {
rot = (180*Math.atan2(mouseY-top.y,mouseX-top.x))/Math.PI + 90;

 }

tank();
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2.
----------------------------------------------------------------------------------------
//import flash.events.MouseEvent;
import flash.events.KeyboardEvent;
import flash.ui.Keyboard;

//var cam: Rectangle = new Rectangle(0,0,stage.stagewidth, stage.Stageheight);
var cam:Rectangle = new Rectangle(0, 0, stage.stageWidth, stage.stageHeight);
var right:Boolean = false;
var left:Boolean = false;
var up:Boolean = false;
var SpeedX:int = 0;
var SpeedY:int = 0;



var level: Array = new Array();
for(var i:int = 0; i<numChildren; i++)
{
if(getChildAt(i) is platform)
{
level.push(getChildAt(i).getRect(this));
//trace(level);
}
}
stage.addEventListener(KeyboardEvent.KEY_DOWN,key_press);
stage.addEventListener(KeyboardEvent.KEY_UP,key_unpress);

function key_press(e:KeyboardEvent):void
{
if(e.keyCode == 39)
{
right = true;

}
if(e.keyCode == 37)
{
left = true;
//trace("left")
}
if(e.keyCode == 38)
{
up = true;

}
/*if(e.keyCode == 40)
{
down = true;

}*/

}
function key_unpress(e:KeyboardEvent):void
{
if(e.keyCode == 39)
{
right = false;

}
if(e.keyCode == 37)
{
left =  false;

}
if(e.keyCode == 38)
{
up = false;

}
/*if(e.keyCode == 40)
{
down = false;

}*/
}
stage.addEventListener(Event.ENTER_FRAME, onenter);
function onenter(e:Event):void
{
if(right == true)
{

SpeedX = 5;
//trace("right");

}
else if(left == true)
{
SpeedX = -5;
//trace("left");

}
else
{
SpeedX *= 0.5;
}

player.x += SpeedX;
//trace(player.x);
for(var i: int=0; i<level.length; i++)
{
if(player.getRect(this).intersects(level[i]))
{
if(SpeedX >0)
{
player.x= level[i].left-player.width/2;

}
if(SpeedX <0)
{
player.x=level[i].right+player.width/2;
}
SpeedX=0;
}
}

SpeedY+=1;
var jump:Boolean = false;
player.y += SpeedY;
//trace(player.x);
for(i = 0; i<level.length; i++)
{
if(player.getRect(this).intersects(level[i]))
{
if(SpeedY >0)
{
player.y= level[i].top-player.height/2;
SpeedY = 0;
jump = true;

}
if(SpeedY <0)
{
player.y=level[i].bottom+player.height/2;
SpeedY *= -0.5;
}

}

}
//trace(up);
if(up && jump)
{
SpeedY = -15;
//trace("hi");

}

cam.x = player.x - cam.width +360;
cam.y = player.y - cam.height + 175;
if(cam.x <= 0)
{
cam.x = 0;
}
if(cam.x >= 2060)
{
cam.x = 2060;
}
if(cam.y <= -300)
{
cam.y = -300;
}
if(cam.y >= 0)
{
cam. y = 0
}
scrollRect = cam;

/*cam.x = player.x - stage.stagewidth/2 360;
cam.y = player.y - stage.stagewidth/2 175;
scrollRect = cam;*/
}

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3.
------------------------------------------------------------------------------------------------------

import flash.events.KeyboardEvent;
import flash.events.Event;
import flashx.textLayout.utils.CharacterUtil;

var speedX = 0;
var speedY = 0;
var scroller = new Rectangle(0, 0, stage.stageWidth, stage.stageHeight);

var level:Array = new Array();

for(var i =0; i < numChildren; i++)
{
if(getChildAt(i) is platform)
{
level.push(getChildAt(i).getRect(this));

}
}
var flg:Boolean = false;
var coin_arr:Array = new Array();
for(var j:int =0; j < 20; j++)
{
var coin:cn = new cn();
addChild(coin);
if(j < 5)
{
coin.x = (j * 3 + 20)*10 + 20;
}
if(j > 4 && j < 7)
{
coin.x = (j * 3 + 20)*10 + 200;
}
if(j > 6 && j < 11)
{
coin.x = (j * 3 + 20)*10 + 300;
}
if(j > 10 && j < 16)
{
coin.x = (j * 3 + 20)*10 + 500;
}
if(j > 15 && j < 19)
{
coin.x = (j * 3 + 19)*10 + 700;
}
coin.y = 150;
coin_arr.push(coin);
}

var kUp:Boolean = false;
var kDwn:Boolean = false;
var kLeft:Boolean = false;
var kRight:Boolean = false;
var score:Number = 0;
HUD.scr.text = score.toString();

stage.addEventListener(KeyboardEvent.KEY_DOWN, kd);
stage.addEventListener(KeyboardEvent.KEY_UP, ku);


function kd(event:KeyboardEvent):void{
switch(event.keyCode)
{
case 37:
kLeft = true;
//trace("left")
break;
case 38:
kUp = true;
//trace("up")
break;
case 39:
kRight = true;
//trace("right")
break;
case 40:
kDwn = true;
//trace("down")
break;
}
}

function ku(event:KeyboardEvent):void{
switch(event.keyCode)
{
case 37:
kLeft = false;
//trace("left")
break;
case 38:
kUp = false;
//trace("up")
break;
case 39:
kRight = false;
//trace("right")
break;
case 40:
kDwn = false;
//trace("down")
break;
}
}

addEventListener(Event.ENTER_FRAME, loop);
function loop(event:Event):void
{

if(kLeft)
{
speedX = -5
}else if(kRight)
{
speedX = 5
}else
{
speedX *= 0.5;
}
player.x += speedX;
for(i = 0; i < level.length; i++)
{
if(player.getRect(this).intersects(level[i]))
{
if(speedX > 0)
{
player.x = level[i].left - player.width / 2;
}
if(speedX < 0)
{
player.x = level[i].right + player.width / 2;
}
speedX = 0;
}
}

var jumpable = false;
speedY += 1;

player.y += speedY;
for(i = 0; i < level.length; i++)
{
if(player.getRect(this).intersects(level[i]))
{
if(speedY > 0)
{
player.y = level[i].top - player.height / 2;
speedY = 0;
jumpable = true;
}
if(speedY < 0)
{
player.y = level[i].bottom + player.height / 2;
speedY *= -0.5;
}
//speedX = 0;
}
}
if(kUp && jumpable)
{
speedY = -15;
}

scroller.x = (player.x - scroller.width+360);
scroller.y = (player.y - scroller.height+175);
if(scroller.x >= 1050){
scroller.x = 1050;
}
if(scroller.x <= 0){
scroller.x = 0;
}
if(scroller.y >= 0){
scroller.y = 0;
}
if(scroller.y <= -610)
{
scroller.y = -610;
}
scrollRect = scroller;
for(var k:int = 0; k < coin_arr.length; k++)
{
if(coin_arr[k].hitTestObject(player))
{
score++;
HUD.scr.text = score.toString();
removeChild(coin_arr[k]);

//trace("hit");
}
}
HUD.x = scroller.x + 70;
HUD.y = scroller.y + 50;
/* if(player.y > 400)
{ trace(player.y);
speedX *= 0;
speedY *= 0;

}*/

}

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