#define button1 D0
#define button2 D1
#define button3 D2
#define button4 D3
#define led D10

#define input1 D7
#define input2 D8
int mode = 0;

bool state1;
bool state2;
bool state3;
bool state4;

bool input1_state ;
bool input2_state ;

void setup() {
  pinMode(led,OUTPUT);
  pinMode(button1,INPUT_PULLDOWN);
  pinMode(button2,INPUT_PULLDOWN);
  pinMode(button3,INPUT_PULLDOWN);
  pinMode(button4,INPUT_PULLDOWN);
  pinMode(input1,INPUT_PULLDOWN);
  pinMode(input2,INPUT_PULLDOWN);
  Serial.begin(9600);
}

void loop() {

state1 = digitalRead(button1);
state2 = digitalRead(button2);
state3 = digitalRead(button3);
state4 = digitalRead(button4);
input1_state = digitalRead(input1);
input2_state = digitalRead(input2);
  if(state1 == HIGH)
  {
    mode = 1;
    Serial.println("mode1");
  } else if ( state3 == HIGH)
  {
    mode = 3;
    Serial.println("mode3");
  } else if ( state2 == HIGH)
  {
    Serial.println("mode2");
    mode = 2;
  } else if ( state4 == HIGH)
  {
    Serial.println("mode4");
    mode = 4;
  }
Serial.println(mode);
switch(mode) {
  case(1):
  digitalWrite(led,(input1_state && input2_state));
  Serial.println("and");
  break;
  case(2):
  digitalWrite(led,(input1_state || input2_state));
  Serial.println("or");
  break;
  case(3):
  digitalWrite(led,!(input1_state && input2_state));
  Serial.println("nand");
  break;
  case(4):
  digitalWrite(led,!(input1_state || input2_state));
  Serial.println("nor");
  break;
  default :
  Serial.println("press input buttons");
  break;
  Serial.println(mode);
} 

}