1.课堂struct练习，用class；

#include <iostream>using namespace std;class Stu
{
private:int age;char sex;int high;
public:double score;void set_values(int a,char b,int c,double d);int get_age();char get_sex();int get_high();
};
void Stu::set_values(int a,char b,int c,double d)
{age = a;sex = b;high = c;score = d;
}
int Stu::get_age()
{return age;
}
char Stu::get_sex()
{return sex;
}
int Stu::get_high()
{return high;
}int main()
{Stu s1;s1.set_values(18,'m',175,99);cout << "age= " << s1.get_age() << endl;cout << "sex= " << s1.get_sex() << endl;cout << "high= " << s1.get_high() << endl;cout << "score= " << s1.score << endl;return 0;
}

2.写一个有默认参数的函数，把声明和定义分开，并在主函数内成功调用

#include <iostream>using namespace std;
int add(int a,int b , int c=100);int main()
{cout << add(1,2)<< endl;return 0;
}
int add(int a,int b , int c)
{return a+b+c;
}

3.结构体字节大小计算

4.思维导图