声明一个student类

声明一个student类，在该类中包括一个数据成员score（分数），两个静态数据成员

#include<iostream>
using namespace std;

class Student{
private:
float score;
static int count;
static float total_score;
public:
void account(float score1)
{score=score1;
++count;
total_score=total_score+score;
}

static float sum()
{return total_score;
}

static float average()
{
return total_score/count;
}

};

int Student:: count=0;
float Student:: total_score=0.0;

int main()
{
Student s1,s2;
s1.account(99);
cout<<Student::sum()<<endl;
cout<<Student::average()<<endl;
s2.account(70);
cout<<Student::sum()<<endl;
cout<<Student::average()<<endl;
return 0;

}