在下面程序的横线处填上适当的语句,使该程序的执行结果为200.#includeclassnumber{private:intval;public:number(inti){val=i;}int();};number::operatorint(){}classnum:publicnumber{public:num(inti):num

Question

在下面程序的横线处填上适当的语句,使该程序的执行结果为200.
#include
class number{
private:
int val;
public:
number(int i){val=i;}
____________int();
} ;
number::operator int(){___________}
class num:public number{
public:
num(int i):number(i){}
};
void main(){
num n(100);
int i =n;
_____________
}

Answer 1

#include
class number{
private:
int val;
public:
number(int i){val=i;}
operator int(); // 填空1
} ;
number::operator int(){return val *= 2;} //填空2
class num:public number{
public:
num(int i):number(i){}
};
void main(){
num n(100);
int i = n;
cout