實在不想做這道題了，先扔在這裏吧
wa就wa吧，感覺自己是個廢人了
感覺大概是格式的問題?反正我代碼很爛不管了
#include<bits/stdc++.h>
using namespace std;
class Student
{
public:
string sid;
int cid,score1,score2,score3,score4,totalscore,rank;
string name;
Student(string sid,int cid,string name,int score1,int score2,int score3,int score4):sid(sid),cid(cid),score1(score1),score2(score2),score3(score3),score4(score4),name(name)
{
}
Student()
{
}//無參構造函數
friend istream& operator >>(istream& in,Student& x)//重定向輸入流
{
in>>x.cid>>x.name>>x.score1>>x.score2>>x.score3>>x.score4;
x.totalscore=x.score1+x.score2+x.score3+x.score4;
x.rank=0;
return in;
}
friend ostream& operator <<(ostream& out,Student& x)
{
out<<x.rank<<" "<<x.sid<<" "<<x.cid<<" "<<x.name<<" "<<x.score1<<" "<<x.score2<<" "<<x.score3<<" ";
out<<x.score4<<" "<<x.totalscore<<" ";
printf("%.2f\n",x.totalscore/4.0);
return out;
}
};
vector<Student> myvector;
void paixu(void)
{
int rnk=1,cnt;
for(int i=400;i>=0;i--)
{
cnt=0;//cnt represents the number of students whose totalscore equals to i
for(auto &it:myvector)
{
if(it.totalscore==i)
{
it.rank=rnk;
cnt++;
}
}
rnk+=cnt;
}
}
void query(void)
{
paixu();//to calculate everyone's rank
double averagescore;
while(true)
{
printf("Please enter SID or name. Enter 0 to finish.\n");
string input;
cin>>input;
if(input=="0")
break;
if(isdigit(input[0]))//the input is student id
{
for(auto &it:myvector)
if(it.sid==input)
{
//printf("The rank of this student is %d\n",it.rank);
cout<<it;
}
}
else
{
for(auto &it:myvector)
if(it.name==input)
cout<<it;
}
}
}
void add(void)
{
while(true)
{
printf("Please enter the SID, CID, name and four scores. Enter 0 to finish.\n");
Student temp;
string tempinput;
cin>>tempinput;
if(tempinput=="0")
break;
else
{
temp.sid=tempinput;
cin>>temp;
}
bool flag=false;
for(auto &it:myvector)
if(it.sid==temp.sid)
flag=true;
if(flag)
printf("Duplicated SID.\n");
else
myvector.push_back(temp);
}
}
void remove(void)
{
while(true)
{
int cnt=0;
printf("Please enter SID or name. Enter 0 to finish.\n");
vector<Student>::iterator it;
string input;
cin>>input;
if(input=="0")
break;
if(isdigit(input[0]))//the input is student id
{
for(it=myvector.begin();it!=myvector.end();)
{
if((*it).sid==input)
{
cnt++;
it=myvector.erase(it);
}
else
it++;
}
}
else//the input is a name
{
for(it=myvector.begin();it!=myvector.end();)
{
if((*it).name==input)
{
cnt++;
it=myvector.erase(it);
}
else
it++;
}
}
printf("%d student(s) removed.\n",cnt);
}
}
void ranking(void)
{
printf("Showing the ranklist hurts students' self-esteem. Don't do that.\n");
}
void statistics(void)
{
double average;
int num_passed,num_failed,id;
printf("Please enter class ID, 0 for the whole statistics.\n");
cin>>id;
//創建一個新的vector用來進行數據統計
vector<Student>stat;
stat.clear();
if(id==0)
{
for(auto &it:myvector)
stat.push_back(it);
}
else
{
for(auto &it:myvector)
{
if(it.cid==id)
stat.push_back(it);
}
}
//對每一門學科進行統計
{
average=num_passed=num_failed=0;
for(auto &it:stat)
{
average+=it.score1;
if(it.score1>=60)
num_passed++;
else
num_failed++;
}
printf("Chinese\n");
if(stat.size()==0)
printf("Average Score: 0.00\n");
else
printf("Average Score: %.2f\n",average/stat.size());
printf("Number of passed students: %d\n",num_passed);
printf("Number of failed students: %d\n\n",num_failed);
}
{
average=num_passed=num_failed=0;
for(auto &it:stat)
{
average+=it.score2;
if(it.score2>=60)
num_passed++;
else
num_failed++;
}
printf("Mathematics\n");
if(stat.size()==0)
printf("Average Score: 0.00\n");
else
printf("Average Score: %.2f\n",average/stat.size());
printf("Number of passed students: %d\n",num_passed);
printf("Number of failed students: %d\n\n",num_failed);
}
{
average=num_passed=num_failed=0;
for(auto &it:stat)
{
average+=it.score3;
if(it.score3>=60)
num_passed++;
else
num_failed++;
}
printf("English\n");
if(stat.size()==0)
printf("Average Score: 0.00\n");
else
printf("Average Score: %.2f\n",average/stat.size());
printf("Number of passed students: %d\n",num_passed);
printf("Number of failed students: %d\n\n",num_failed);
}
{
average=num_passed=num_failed=0;
for(auto &it:stat)
{
average+=it.score4;
if(it.score4>=60)
num_passed++;
else
num_failed++;
}
printf("Programming\n");
if(stat.size()==0)
printf("Average Score: 0.00\n");
else
printf("Average Score: %.2f\n",average/stat.size());
printf("Number of passed students: %d\n",num_passed);
printf("Number of failed students: %d\n\n",num_failed);
}
int num_pass[5]={0,0,0,0,0};//num_pass[i] represents the number of students who pass no less than i courses
//exception:num_pass[0] represents the number of students who failed all the tests
for(auto &it:stat)
{
int cnt=0;//統計每個人過了幾門課
if(it.score1>=60)
cnt++;
if(it.score2>=60)
cnt++;
if(it.score3>=60)
cnt++;
if(it.score4>=60)
cnt++;
for(int i=1;i<=4;i++)
{
if(cnt>=i)
num_pass[i]++;
}
if(cnt==0)
num_pass[0]++;
}
printf("Overall:\n");
printf("Number of students who passed all subjects: %d\n",num_pass[4]);
printf("Number of students who passed 3 or more subjects: %d\n",num_pass[3]);
printf("Number of students who passed 2 or more subjects: %d\n",num_pass[2]);
printf("Number of students who passed 1 or more subjects: %d\n",num_pass[1]);
printf("Number of students who failed all subjects: %d\n\n",num_pass[0]);
}
void menu(void)//主菜單
{
int x;
bool flag=true;//控制何時退出
while(flag)
{
printf("Welcome to Student Performance Management System (SPMS).\n\n");
printf("1 - Add\n");
printf("2 - Remove\n");
printf("3 - Query\n");
printf("4 - Show ranking\n");
printf("5 - Show Statistics\n");
printf("0 - Exit\n\n");//watch out for this \n!!!
cin>>x;
switch(x)
{
case 1:add();
break;
case 2:remove();
break;
case 3:query();
break;
case 4:ranking();
break;
case 5:statistics();
break;
case 0:flag=false;
}
}
}
int main(void)
{
//freopen("in.txt","r",stdin);
//freopen("out.txt","w",stdout);
myvector.clear();
menu();
return 0;
}
