TZOJ5703: C++实验：学生成绩类的实现

#include<iostream>
#include<string>
#include<stdio.h>
using namespace std;
class student
{
    public:
    static int sum,num;
    int score;
    string name;
    student(string name="",int score=):
    name(name),score(score){}
    void print_avg()
    {
        printf("%.2lf",sum*1.0/num);
    }
};
int student::sum=;
int student::num=;