引用+函数扩充+结构体

1.把课堂上的结构体类型改为class类型

#include <iostream>

using namespace std;
class stu
{
    double sorce=50.1;
    int age=18;
    char sex='m';
    int tall=180;
public:
    int getage();
    char getsex();
    int gettall();
    void set(int a,char b,int c);
};
int stu::getage()
{
    return age;
}
char stu::getsex()
{
    return sex;
}
int stu::gettall()
{
    return tall;
}
void stu::set(int a,char b,int c)
{
    age=a;
    sex=b;
    tall=c;
}
int main()
{
    cout<<"age"<<"\t";
    cout<<"sex"<<"\t";
    cout<<"tall"<<endl;
    stu s1;
    cout<<s1.getage()<<"\t";
    cout<<s1.getsex()<<"\t";
    cout<<s1.gettall()<<endl;
    s1.set(12,'w',160);
    cout<<s1.getage()<<"\t";
    cout<<s1.getsex()<<"\t";
    cout<<s1.gettall()<<endl;
    stu s2;
    s2.set(20,'m',185);
    cout<<s2.getage()<<"\t";
    cout<<s2.getsex()<<"\t";
    cout<<s2.gettall()<<endl;
    cout<<sizeof(s1)<<endl;
    return 0;
}

2.写一个有默认参数的函数，将函数的声明和定义分开，在主函数内成功调用

#include <iostream>

using namespace std;
int add(int a,int b,int c=3);
int main()
{
    cout<<add(1,2)<<endl;
    return 0;
}
int add(int a,int b,int c)
{
    return a+b+c;
}