#include<stdlib.h>
#include<iostream.h>
class calculation
{
public:
 void add();
 void sub();
 void mul();
 void div();
 void setxy(double x1,double y1);
privte:
double x,y;
}
 void main (int argc,char *argv[])
  void (calculation::*pfun)();
 cslculation call;
 if (argc!=4)
 {
  cout<<"ERROR!!"<<endl;
  cout<<usage:for example:cal 3 + 5"<<endl;
   return;
 }
 switch (srgv[2][0])]
 {case '+': pfun=calculation::add;
 break;
 case '-': pfun=calculation::sub;
  break;
 case '*': pfun=calculation::mul;
  break;
 case '/': pfun=calculation::dir;
  break;
 default: {cout<<"operator is error!";
  return;
    }
 }
 call setxy(atof(argv[1],atof(argv[3]));
 call *pfun();
 void calculation::add()
 {cout<<"x="<<x<<"y="<<y<<"\t\tx+y="<<x+y<<endl;
 }
 void calculation::sub;
 {cout<<"x="<<x<<"y="<<y<<"\t\tx+y="<<x+y<<endl;
 }
 void calculation::mul;
 {cout<<"x="<<x<<"y="<<y<<"\t\tx+y="<<x+y<<endl;
 }
 void calculation::dir;
 {cout<<"x="<<x<<"y="<<y<<"\t\tx+y="<<x+y<<endl;
 }
 void calculation::setxy(double x1, double y1)
 {x=x1;
 y=y1;
 }

看看有什么问题 拜托拜托..............

這麼長？看不懂........

用C编的哦~看不懂