First arduino project: flash led

1// plug led in breadboard.  Then plug in two wires one on the negative  and the other on the positive side of the led.  The positive side is the side with  the long leg.
2// plug the positive side in to digital pin 4 on the arduino.  Then  upload this code.  YOu should see the led flash on and off.
3
4int ledpin =  4;  // tells the arduino board what pin the led is on. You could use a different  pin but make sure to change the number.
5void setup(){// anything in this will  only run once
6  pinMode(ledpin, OUTPUT); // this tells the arduino that the ledpin  is an output
7    
8  
9}
10void loop(){ // any code in this will run forever
11  digitalWrite(ledpin, HIGH);  // this make the ledpin high or turns it on
12  delay(1000);  // this make the arduino pause before going on to the next line
13  digitalWrite(ledpin,  LOW);  // this makes the ledpin low or turn off
14  delay(1000);
15}
16