//SwitchOp2.java
//對例3.10的修改
public class SwitchOp2
{
  public static void main(String args[])
    {
	  float a=9; 
	  float b=3; 
	  float result;
	  char op='+';
	  switch(op)
	  {
	  	case '+':	result=a+b;break;
	  	case '-':	result=a-b;break;
	  	case '*':	result=a*b;break;
	  	case '/':	result=a/b;break;
	  	default:	result=0;
	  }
	  System.out.println("result="+result);
	}
}