int x = 0;  
int y = 0;

void setup ( )  
{  
  Serial.begin ( 9600 ); 
  Serial.println(" Enter two numbers separated by a 'Space'");
}  
void loop ( )  
{
  if (Serial.available() > 0)
    {
      x = Serial.parseInt();
      y = Serial.parseInt();
      Serial.readStringUntil('\n');
      
      if ( x > y )  
        { Serial.println ( " x is greater than y " ); }  
      else if ( x == y )
        { Serial.println( " x is equal to y "); }
      else
        { Serial.println ( " x is smaller than y " ); }
      Serial.println(" ");
      Serial.println(" Enter two numbers separated by a 'Space' ");
    }
}