SRAM Working

int dataPins[] = {2,3,4,5};
int NUMBER_OF_DATA_PINS = 4;
int addrPins[] = {7,8,9,10};
int NUMBER_OF_ADDR_PINS = 4;
int oe = 11;
int we = 12;

void setup(){
  for(int a = 0; a < NUMBER_OF_ADDR_PINS; a++){
    pinMode(addrPins[a], OUTPUT);
  }

  pinMode(oe,OUTPUT);
  pinMode(we,OUTPUT);
}

void setAddr(byte addr){
  for(int a = 0; a < NUMBER_OF_ADDR_PINS; a++){
    if((addr >> a) & 0x01){
      digitalWrite(addrPins[a],HIGH);
    }else{
      digitalWrite(addrPins[a],LOW);
    }
  }
}

void setData(byte data){
  for(int a = 0; a < NUMBER_OF_DATA_PINS; a++){
    pinMode(dataPins[a],OUTPUT);
    if((data >> a) & 0x01){
      digitalWrite(dataPins[a],HIGH);
    }else{
      digitalWrite(dataPins[a],LOW);
    }
  }
}

void writeData(byte addr, byte data){
  setAddr(addr);
  digitalWrite(we,LOW);
  setData(data);
  digitalWrite(we,HIGH);
}

byte readData(byte addr){
  byte data = 0x00;
  setAddr(addr);

  digitalWrite(oe,LOW);
  for(byte a = 0; a < NUMBER_OF_DATA_PINS; a++){
    pinMode(dataPins[a],INPUT);
    if(digitalRead(dataPins[a])){
      data |= (0x01 << a);
    }
  }
  digitalWrite(oe,HIGH);
  return data;
}

void loop(){
  for(int a = 0; a < 16; a++){
    writeData(a,a);
  }

  for(int a = 0; a < 16; a++){
    Serial.print("Looking at address: ");
    Serial.print(a,DEC);
    Serial.print(" Got back: ");
    Serial.println(readData(a),DEC);
    delay(1000);
  }
}