const byte digitPins[4] = {8, 9, 10, 11};  
const byte pinPont = A5;  
const byte symbols[10] = {  
  0b01111110,  
  0b00001100,  
  0b10110110,  
  0b10011110,  
  0b11001100,  
  0b11011010,  
  0b11111010,  
  0b00001110,  
  0b11111110,  
  0b11011110  
};  
  
void setup() {  
  for (byte i = 1; i < 8; i++) {  
    pinMode(i, OUTPUT);  
    digitalWrite(i, 0);  
  }  
  for (byte i = 0; i < 4; i++) {  
    pinMode(digitPins[i], OUTPUT);  
    digitalWrite(digitPins[i], 0);  
  }  
  pinMode(pinPont, INPUT);  
}  
  
void loop() {  
  static byte prevPin;  
  short value = analogRead(pinPont);  
    
  float scaledValue = value * (50.0 / 1023.0);  
    
  int integerPart = (int)scaledValue;  
  float fractionalPart = scaledValue - integerPart;  
    
 
  for (int8_t i = 1; i >= 0; i--) {  
    digitalWrite(digitPins[prevPin], 0);  
    prevPin = i;  
    PORTD = ~symbols[integerPart % 10];  
    integerPart /= 10;  
    digitalWrite(digitPins[i], 1);
    delay(5);  
  }  
    
  digitalWrite(digitPins[prevPin], 0);  
  prevPin = 2;  
  PORTD = 0b00000001;  
  digitalWrite(digitPins[2], 1);  
  delay(5);


  fractionalPart *= 100;  
  int fractionalPartInt = (int)fractionalPart;  
  for (int8_t i = 3; i >= 2; i--) {  
    digitalWrite(digitPins[prevPin], 0);  
    prevPin = i;  
    fractionalPartInt /= 10; 
    PORTD = ~symbols[fractionalPartInt % 10];  
    digitalWrite(digitPins[i], 1);  
    delay(5);
  }  
}