3 统计学生出勤情况

#include <iostream>
#include <cstring>
using namespace std;
const int N=10010;
struct Stu
{
    int id;
    int present_num;
    int delay_num;
    int dis_num;
};

Stu stu[N];

void menu(Stu s,int sum)
{
    puts("-----------------------------------------");
    cout<<"学生学号："<<s.id<<endl;
    cout<<"正常上课次数："<<s.present_num<<endl;
    cout<<"迟到次数："<<s.delay_num<<endl;
    cout<<"缺勤次数："<<s.dis_num<<endl;
    printf("上课率：%.6lf\n",(double)(s.present_num+s.delay_num)/sum);
    printf("旷课率：%.6lf\n",(double)s.dis_num/sum);
    puts("-----------------------------------------");
}

void sum_menu(int n,int m)
{
    puts("*******************************************");
    int sp=0,sd=0,su=0;
    for(int i=0;i<n;i++)
    {
        sp+=stu[i].present_num;
        sd+=stu[i].delay_num;
        su+=stu[i].dis_num;
    }
    cout<<"总正常出勤次数："<<sp<<endl;
    cout<<"总迟到次数："<<sd<<endl;
    cout<<"总缺席次数："<<su<<endl;
    printf("平均出勤率：%.6lf\n",(double)(sp+sd)/(n*m));
    puts("*******************************************");
}
int main()
{
    int n,m;
    cin>>n>>m;
    for(int i=0;i<n;i++)
    cin>>stu[i].id>>stu[i].present_num>>stu[i].delay_num>>stu[i].dis_num;

    for(int i=0;i<n;i++)
    {
        menu(stu[i],m);
    }
    sum_menu(n,m);
    return 0;
}

/*
5 6
1 2 3 1
2 3 1 2
3 2 2 2
4 6 0 0
5 5 1 0
*/