int leda = 7;
int ledb = 9;
int ledc = 11;
int ledd = 13;

int btna = 6;
int btnb = 8;
int btnc = 10;
int btnd = 12;

int btnstatea = 0;
int btnstateb = 0;
int btnstatec = 0;
int btnstated = 0;

void setup() {
  // put your setup code here, to run once:
pinMode(leda, OUTPUT);
pinMode(ledb, OUTPUT);
pinMode(ledc, OUTPUT);
pinMode(ledd, OUTPUT);
pinMode(btna, INPUT);
pinMode(btnb, INPUT);
pinMode(btnc, INPUT);
pinMode(btnd, INPUT);


}

void loop() {
  // put your main code here, to run repeatedly:
btnstatea = digitalRead(btna);
btnstateb = digitalRead(btnb);
btnstatec = digitalRead(btnc);
btnstated = digitalRead(btnd);


if(btnstatea == HIGH){
  digitalWrite(leda, HIGH);
}
else{
  digitalWrite(leda, LOW);
}

if(btnstateb == HIGH){
  digitalWrite(ledb, HIGH);
}
else{
  digitalWrite(ledb, LOW);
}

if(btnstatec == HIGH){
  digitalWrite(ledc, HIGH);
}
else{
  digitalWrite(ledc, LOW);
}

if(btnstated == HIGH){
  digitalWrite(ledd, HIGH);
}
else{
  digitalWrite(ledd, LOW);
}


}