Putting Code into your Post. [sourcecode] tag 

To embed code into your post, just wrap your code in sourcecode tags:

Ref Link: http://en.support.wordpress.com/code/posting-source-code/

It will look like this:

long randNumber;

void setup(){
 Serial.begin(9600);
//  randomSeed(analogRead(0));
}

void loop(){
 randNumber = random(10);
 Serial.println(randNumber);

 delay(50);
}