//local variables cannot be used without intialization.
//data types
public class Demo1{
       public static void main(String args[])
	   {
			int x=10;
			System.out.println(x);
   			byte y=127;
			System.out.println(y);
//by default java treats float as double
			double z=12.4;
			System.out.println(z);
			float a=2.7f;
			System.out.println(a);
			double s=0.0d;
			System.out.println(s);
	   }
}