package ss.jsp;import java.math.*;public class QQ {	Double first;	Double second;	String pro;	Double result;			public void setFirst(Double first) {		this.first=first; 	}	public void setSecond(Double second) {		this.second=second; 	}	public void setPro(String pro) {		this.pro = pro; 	}	public void setResult(Double result) {		this.result=result; 	}	public Double getFirst() {		return (this.first); 	}	public Double getSecond() {		return (this.second); 	}	public String getPro() {		return (this.pro); 	}    public Double getResult(){     if(pro.equals("+"))       {  result=first+second;       }       else if(pro.equals("-"))       {  result=first-second;       }      else if(pro.equals("*"))       {  result=first*second;       }      else if(pro.equals("/"))       {  result=first/second;       }      return result;     }}