int i;

void setup()
{
  Serial.begin(9600);
  Serial.println("Dec  Hex  Oct  Bit");
  for (i=1; i<=20; i++)
  {
    Serial.print(i,DEC);
    Serial.print(“\t");
    Serial.print (i, HEX);
    Serial.print("It");
    Serial.print(i,OCT);
    Serial.print("\t");
    Serial.printin(i, BIN);
  }
}