#include<iostream>
using namespace std;
class date{
public:
friend void print();
date(){
day=1;
month=2;
year=3;
}
~date(){
cout<<"bye";
}
int setdate(int x,int y, int z){
day=x;
month=y;
year=z;
}
private:
int day,month,year;
};
void print(){
cout<<day<<month<<year<<endl;
}
int main(){
date a;
print();
a.setdate(5,8,9);
print();
}
解决方案
40
你好歹也传个对象给print当参数，不然怎么打印？
#include<iostream>
using namespace std;
class date{
public:
friend void print(date &a);
date(){
day=1;
month=2;
year=3;
}
~date(){
cout<<"bye";
}
void setdate(int x,int y, int z){
day=x;
month=y;
year=z;
}
private:
int day,month,year;
};
void print(date &a){
cout<<a.day<<a.month<<a.year<<endl;
}
int main(){
date a;
print(a);
a.setdate(5,8,9);
print(a);
}
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