public class Primitives {
  public static void main(String[] args) {
    
    double d;
    int i;
    
    d = 7.2; // ok? why?
    d = 7;   // ok? why?
    
    i = 7; // ok?
    d = i; // ok?
    // System.out.println(d); // output?
  
    // i = d; // this is bad ... why?
  }
}