title: Expected unqualified-id before numeric constan Arduino
body: <p>I'm attaching my rfid MFRC522 to my Arduino when I get this error:</p>
  
  <pre><code>Arduino: 1.6.6 Hourly Build 2015/09/18 03:38 (Windows 7), Board: "Arduino/Genuino Uno"
  
  sketch_mar11b:34: error: expected unqualified-id before numeric constant
  
  sketch_mar11b.ino:36:10: note: in expansion of macro 'SS_PIN'
  
  sketch_mar11b:34: error: expected ')' before numeric constant
  
  sketch_mar11b.ino:36:10: note: in expansion of macro 'SS_PIN'
  
  sketch_mar11b.ino: In function 'void setup()':
  
  sketch_mar11b:41: error: expected initializer before '.' token
  
  sketch_mar11b.ino: In function 'void loop()':
  
  sketch_mar11b:47: error: 'mfrc522' was not declared in this scope
  
  sketch_mar11b:52: error: 'mfrc522' was not declared in this scope
  
  sketch_mar11b:57: error: 'mfrc522' was not declared in this scope
  
  exit status 1
  expected unqualified-id before numeric constant
  
    This report would have more information with
    "Show verbose output during compilation"
    enabled in File &gt; Preferences.
  </code></pre>
  
  <p>But this is my regular code for my stuff:</p>
  
  <pre><code>/*
   * MFRC522 - Library to use ARDUINO RFID MODULE KIT 13.56 MHZ WITH TAGS SPI W AND R BY COOQROBOT.
   * The library file MFRC522.h has a wealth of useful info. Please read it.
   * The functions are documented in MFRC522.cpp.
   *
   * Based on code Dr.Leong   ( WWW.B2CQSHOP.COM )
   * Created by Miguel Balboa (circuitito.com), Jan, 2012.
   * Rewritten by Søren Thing Andersen (access.thing.dk), fall of 2013 (Translation to English, refactored, comments, anti collision, cascade levels.)
   * Released into the public domain.
   *
   * Sample program showing how to read data from a PICC using a MFRC522 reader on the Arduino SPI interface.
   *----------------------------------------------------------------------------- empty_skull 
   * Aggiunti pin per arduino Mega
   * add pin configuration for arduino mega
   * http://mac86project.altervista.org/
   ----------------------------------------------------------------------------- Nicola Coppola
   * Pin layout should be as follows:
   * Signal     Pin              Pin               Pin
   *            Arduino Uno      Arduino Mega      MFRC522 board
   * ------------------------------------------------------------
   * Reset      9                5                 RST
   * SPI SS     10               53                SDA
   * SPI MOSI   11               52                MOSI
   * SPI MISO   12               51                MISO
   * SPI SCK    13               50                SCK
   *
   * The reader can be found on eBay for around 5 dollars. Search for "mf-rc522" on ebay.com. 
   */
  
  #include &lt;SPI.h&gt;
  #include &lt;MFRC522.h&gt;
  
  #define SS_PIN 10
  #define RST_PIN 9
  MFRC522 (SS_PIN, RST_PIN);  // Create MFRC522 instance.
  
  void setup() {
  Serial.begin(9600); // Initialize serial communications with the PC
  SPI.begin();  // Init SPI bus
  MFRC522 mfrc522.PCD_Init(); // Init MFRC522 card
  Serial.println("Scan PICC to see UID and type...");
  }
  
  void loop() {
  // Look for new cards
  if ( ! mfrc522.PICC_IsNewCardPresent()) {
  return;
  }
  
  // Select one of the cards
  if ( ! mfrc522.PICC_ReadCardSerial()) {
  return;
  }
  
  // Dump debug info about the card. PICC_HaltA() is automatically called.
  mfrc522.PICC_DumpToSerial(&amp;(mfrc522.uid));
  }
  </code></pre>
  
  <p>Now I don't understand What I'm doing wrong. I can't use the Int method cause that makes a constant number to be assigned, but I'm not adding a numeric value. Why am I getting these errors?</p>