public class fushu{
	String A;
	String shi(double a,double b){
		if (a!=0)
		{if (b>0)
		  A=Double.toString(a)+"+"+Double.toString(b)+"j";
		else 
		  if (b<0 )
		      A=Double.toString(a)+Double.toString(b)+"j";
		      else 
		        A=Double.toString(a);}
	else 
	    {if (b!=0)
		  A=b+"j";
		else 
		  System.out.println("A not exist");
		 }
   return A;
		}
	public static void main(String arg[]){
		fushu shu1=new fushu();
		fushu shu2=new fushu();
		double a1=1,b1=-5,a2=0.5,b2=0.5;
		
		System.out.println (shu1.shi(a1,b1));
		System.out.println("  +");
		System.out.println(shu2.shi(a2,b2));
		System.out.println("  =");
		System.out.println(shu1.jiafa(a1,b1,a2,b2));
		
	   	}
	String jiafa(double a1,double b1,double a2,double b2){
	    double a,b;
	    a=a1+a2;
	    b=b1+b2;
	   A= shi(a,b);
		return A;
		}
	String jianfa(double a1,double b1,double a2,double b2){
		double a,b;
	    a=a1-a2;
	    b=b1-b2;
	   A= shi(a,b);
		return A;
		}
  	}