表达式类型转换问题

public class java6_15 {

/**
* @param args
*/
public static void main(String[] args) {
// TODO Auto-generated method stub
char ch='a';
short a=-2;
int b=3;
float f=5.3f;
double d=6.28;
System.out.print("(ch/a)-(d/f)-(a+b)=");
System.out.println((ch/a)-(d/f)-(a+b));
}