3.struct和class

#include<iostream>
using namespace std;

class C1
{
    int m_A;//默认权限：private私有
};
struct C2
{
    int m_A;//默认权限：public公共
};
int main()
{
    C1 c1;
    //c1.m_A = 100;默认private私有，类外不可访问

    C2 c2;
    c2.m_A = 100;//默认public公共，类外可以访问

    system("pause");
    return 0;
}