c++的重载在计算器中的应用

bool Push(double i){  //不同数值代表不同符号
        lnkNode *tmp=new lnkNode(i);
        tmp->Setnext(top);
        top=tmp;
        size++;
        return true;
    }
    bool Push(long n,long d){
        lnkNode *tmp=new lnkNode(n,d);
        tmp->Setnext(top);
        top=tmp;
        size++;
        return true;
    }
    bool Pop(double &item){
        lnkNode *tmp;
        if(0==size){
            printf("emptyerror");
            return false;
        }
        item=top->Getinfo();
        tmp=top->Getnext();
        delete top;
        top=tmp;
        size--;
        return true;
    }

    bool Pop(long &n,long &d){
        lnkNode *tmp;
        if(0==size){
            printf("emptyerror");
            return false;
        }
        n = top->Getnt();
        d = top->Getdt();
        tmp = top->Getnext();
        delete top;
        top = tmp;
        size--;
        return true;
    }