数据的共享与保护1

#include<iostream>
using namespace std;
class A{
public:
A(int i);
void print();
private:
const int a;
static const int b;
};
const intA::b=10;
A::A(int i):a(i){}
void A::print(){
cout<<a<<":"<<b<<endl;
}
int main(){
A a1(100),a2(0);
a1.print();
a2.print();
return 0;
}