Arduino : OLED distance

#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#include <NewPing.h>
#define PIN_TRIG 2
#define PIN_ECHO 3
#define MAX_DIST 450
#define OLED_RESET 4
Adafruit_SSD1306 display(OLED_RESET);

NewPing rilevatore(PIN_TRIG,PIN_ECHO,MAX_DIST);

void setup()   {
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  
  delay(1000);
  display.clearDisplay();
}

void loop(){
	delay(100);
	unsigned int uS = rilevatore.ping();
  int cm = rilevatore.convert_cm(uS);
  Serial.println(cm);
  display.clearDisplay();
  display.setTextSize(2);
  display.setTextColor(WHITE);
  display.setCursor(5,0);
  display.println("cm:");
  display.println(cm);
  display.display();
}