void setup() 
{
  Serial.begin(9600);
  
  // prints title with ending line break
  Serial.println("ASCII Table ~ Character Map");

  // wait for the long string to be sent
  delay(100);
}

int number = 33; // first visible character '!' is #33

void loop()
{
  Serial.print(number, BYTE);    // prints value unaltered, first will be '!'
  
  Serial.print(", dec: ");
  Serial.print(number);          // prints value as string in decimal (base 10)
  // Serial.print(number, DEC);  // this also works
  
  Serial.print(", hex: ");
  Serial.print(number, HEX);     // prints value as string in hexadecimal (base 16)
  
  Serial.print(", oct: ");
  Serial.print(number, OCT);     // prints value as string in octal (base 8)
  
  Serial.print(", bin: ");
  Serial.println(number, BIN);   // prints value as string in binary (base 2)
                                 // also prints ending line break

  // if printed last visible character '~' #126 ...
  if(number == 126) {
    // loop forever
    while(true) {
      continue;
    }
  }

  number++;  // to the next character
  
  delay(100);  // allow some time for the Serial data to be sent
}