#include <TM1637.h>
const int DIO1 = 5;
const int CLK1 = 6;
const int DIO2 = 7;
const int CLK2 = 8;
const int DIO3 = 9;
const int CLK3 = 10;
const int DIO4 = 11;
const int CLK4 = 12;

TM1637 tm1(CLK1, DIO1);
TM1637 tm2(CLK2, DIO2);
TM1637 tm3(CLK3, DIO3);
TM1637 tm4(CLK4, DIO4);

int operand1 = 0;
int operand2 = 0;
int sum = 0;
int difference = 0;
int product = 0;
int quotient = 0;

void setup() {
  Serial.begin(9600);
  pinMode(2, INPUT_PULLUP);
  tm1.init();
  tm2.init();
  tm3.init();
  tm4.init();
  tm1.set(BRIGHT_TYPICAL);
  tm2.set(BRIGHT_TYPICAL);
  tm3.set(BRIGHT_TYPICAL);
  tm4.set(BRIGHT_TYPICAL);
}

void loop() {
  operand1 = map(analogRead(A0), 0, 1023, 0, 9);
  operand2 = map(analogRead(A1), 0, 1023, 0, 9);
  Serial.print("Operand A = ");
  Serial.println(operand1);
  Serial.print("Operand B = ");
  Serial.println(operand2);
  sum = operand1 + operand2;
  difference = operand1 - operand2;
  product = operand1 * operand2;
  quotient = operand1 / operand2;
  if(operand1 == 0)
  {
    digitalWrite(4, HIGH);
  }
  else
  {
    digitalWrite(4, LOW);
  }
  if(operand2 == 0)
  {
    digitalWrite(3, HIGH);
  }
  else
  {
    digitalWrite(3, LOW);
  }

  if(digitalRead(2) == LOW)
  {
    tm4.display(2, (sum / 10) % 10);
    tm4.display(3, sum % 10);

    tm3.display(2, (difference / 10) % 10);
    tm3.display(3, difference % 10);

    tm2.display(2, (quotient / 10) % 10);
    tm2.display(3, quotient % 10);

    tm1.display(2, (product / 10) % 10);
    tm1.display(3, product % 10);
  }


  delay(100);
}