// Q-8 Write a program to interface LEDs at pins 10,11,12,13 amd button at pins 7. the press of first time
// button  at pin 7(increment button) is pressed first led  at pin 10 is switched on, when second time button
// is pressed the next led at 11 is switched on. Similarly , when the button at pin 8 (decrement button) 
// is pressed the LedS ARE switched off sequentially. 

int yled=13;
int bled=12;
int gled=11;
int rled=10;
int btn1=7;
int btn2=8;


void setup() {
  // put your setup code here, to run once:
pinMode(yled, OUTPUT);
pinMode(bled, OUTPUT);
pinMode(gled, OUTPUT);
pinMode(rled, OUTPUT);
pinMode(btn1, INPUT);
pinMode(btn2, INPUT);
 Serial.begin(9600);
}

void loop() {
  // put your main code here, to run repeatedly:
int data1=digitalRead(btn1);
int data2=digitalRead(btn2);
static int c=0;
//Serial.print(data1);
//Serial.print(c);
  if(data1==HIGH)
  {
    digitalWrite(yled, HIGH);
    if(c==1)
    {
    digitalWrite(bled, HIGH);
    }
    else
    if(c==2)
    {
    digitalWrite(gled, HIGH);
    }
    else
    if(c==3)
    {
    digitalWrite(rled, HIGH);  
    }
    c++; 
  }
  delay(100);
    if(data2==HIGH)
  {
    digitalWrite(rled, LOW);
    if(c==3)
    {
    digitalWrite(gled, LOW);
    }
    else
    if(c==2)
    {
    digitalWrite(bled, LOW);
    }
    else
    if(c==1)
    {
    digitalWrite(yled, LOW);  
    }
    c--; 
  }
  delay(100);
}