12412 - A Typical Homework (a.k.a Shi Xiong Bang Bang Mang)
Posted: Sun Nov 25, 2012 11:42 am
Can someone help me figure out what is wrong with my code ?
This problem seems easy but long. I spent like almost 3 hours to make it. However, I kept on getting WA
Help me please.
This problem seems easy but long. I spent like almost 3 hours to make it. However, I kept on getting WA
Help me please.
Code: Select all
import java.util.Scanner;
import java.text.*;
class Student {
long CID;
String SID;
String name;
int Chinese,Math, English, Programming;
public Student (String name1, String SID1, long CID1, int Chinese1, int Math1, int English1,int Programming1 )
{
name = name1;
SID = SID1;
CID = CID1;
Chinese = Chinese1;
Math = Math1;
English = English1;
Programming = Programming1;
}
public int getTotalScore ()
{
return Chinese + Math + English + Programming;
}
public double getAverageScore ()
{
double rs = ((double) getTotalScore ())/4.0;
return rs;
}
public String toString ()
{
String rs = "";
DecimalFormat df = new DecimalFormat("##.00");
rs = rs + SID + " " + CID + " " + name + " " + Chinese + " " + Math + " " + English + " " + Programming + " " + getTotalScore () + " " + df.format(getAverageScore ());
return rs;
}
public String getSID ()
{
return SID;
}
}
public class Main {
public static void MainMenu ()
{
System.out.println ("Welcome to Student Performance Management System (SPMS).");
System.out.println ("");
System.out.println ("1 - Add");
System.out.println ("2 - Remove");
System.out.println ("3 - Query");
System.out.println ("4 - Show ranking");
System.out.println ("5 - Show Statistics");
System.out.println ("0 - Exit");
System.out.println ("");
}
public static void main (String [] args)
{
String name;
DecimalFormat df = new DecimalFormat("##.00");
long CID;
String SID;
int Chinese,Math,Programming,English;
Student [] StudentList = new Student [100];
int NbOfStudent = 0;
String input;
Scanner kb = new Scanner (System.in);
int option;
while (true)
{
MainMenu ();
option = kb.nextInt ();
if (option == 0)
{
System.exit (0);
}
else
if (option == 1)
{
while (true)
{
System.out.println ("Please enter the SID, CID, name and four scores. Enter 0 to finish.");
SID = "";
while (SID.equals (""))
SID = kb.next ();
if (SID.equals ("0"))
break;
CID = kb.nextLong ();
name = "";
while (name.equals (""))
name = kb.next ();
Chinese = kb.nextInt ();
Math = kb.nextInt ();
Programming = kb.nextInt ();
English = kb.nextInt ();
boolean Duplicated = false;
for (int i = 0; i < NbOfStudent; i++)
if (StudentList[i].getSID ().equals(SID))
{
Duplicated = true;
break;
}
if (Duplicated)
System.out.println ("Duplicated SID.");
else
{
StudentList [NbOfStudent] = new Student (name, SID, CID, Chinese,Math, Programming, English );
NbOfStudent ++;
}
}
}
else
if (option == 2)
{
while (true)
{
System.out.println ("Please enter SID or name. Enter 0 to finish.");
String query = "";
while (query.equals (""))
query = kb.nextLine ();
if (query.equals ("0"))
break;
int xx = 0;
int i = 0;
while (i < NbOfStudent)
{
if (StudentList[i].name.equals (query) || StudentList[i].SID.equals (query))
{
xx ++;
for (int j = i; j < NbOfStudent - 1; j++)
StudentList[j] = new Student (StudentList[j+1].name,StudentList[j+1].SID, StudentList[j+1].CID, StudentList[j+1].Chinese, StudentList[j+1].Math, StudentList[j+1].English, StudentList[j+1].Programming);
NbOfStudent = NbOfStudent - 1;
}
else
i++;
}
System.out.println (xx + " student(s) removed.");
}
}
else
if (option == 3)
{
while (true)
{
System.out.println ("Please enter SID or name. Enter 0 to finish.");
String query;
query = "";
while (query.equals (""))
query = kb.nextLine ();
if (query.equals ("0"))
break;
for (int i = 0; i < NbOfStudent; i++)
if (StudentList[i].name.equals (query) || StudentList[i].getSID().equals (query))
{
int rank = 1;
for (int j = 0; j < NbOfStudent; j++)
if (StudentList[j].getTotalScore() > StudentList[i].getTotalScore ())
rank ++;
System.out.println (rank + " " + StudentList[i]);
}
}
}
else
if (option == 4)
{
System.out.println ("Showing the ranklist hurts students' self-esteem. Don't do that.");
}
else
if (option == 5)
{
System.out.println ("Please enter class ID, 0 for the whole statistics.");
int classID;
classID = kb.nextInt ();
int totalStudent = 0;
int totalMath = 0;
int totalChinese = 0;
int totalEnglish = 0;
int totalProgramming = 0;
int passChinese = 0;
int failChinese = 0;
int passMath = 0;
int failMath = 0;
int passEnglish = 0;
int failEnglish = 0;
int passProgramming = 0;
int failProgramming = 0;
int pass4 = 0;
int pass3 = 0;
int pass2 = 0;
int failAll = 0;
int pass1 = 0;
for (int i = 0; i < NbOfStudent; i++)
if (classID == 0 || classID == StudentList[i].CID)
{
totalStudent ++;
Math = StudentList[i].Math;
English = StudentList[i].English;
Programming = StudentList[i].Programming;
Chinese = StudentList[i].Chinese;
totalMath = Math + totalMath;
totalEnglish = English + totalEnglish;
totalProgramming = Programming + totalProgramming;
totalChinese = Chinese + totalChinese;
int totalPass = 0;
if (Chinese >= 60)
{
totalPass ++;
passChinese ++;
}
else
{
failChinese++;
}
if (Math >= 60)
{
totalPass ++;
passMath ++;
}
else
{
failMath++;
}
if (English >= 60)
{
totalPass ++;
passEnglish ++;
}
else
{
failEnglish++;
}
if (Programming >= 60)
{
totalPass ++;
passProgramming ++;
}
else
{
failProgramming ++;
}
if (totalPass == 0)
failAll ++;
if (totalPass >= 1)
pass1 ++;
if (totalPass >= 2)
pass2 ++;
if (totalPass >= 3)
pass3 ++;
if (totalPass >= 4)
pass4 ++;
}
double AverageSubject;
//Chinese
System.out.println ("Chinese");
System.out.print ("Average Score: ");
if (totalStudent != 0)
{
AverageSubject = ((double)totalChinese)/ ((double)totalStudent);
System.out.print (df.format (AverageSubject));
}
else
System.out.println ("0.00");
System.out.println ();
System.out.println ("Number of passed students: " + passChinese);
System.out.println ("Number of failed students: " + failChinese);
System.out.println ();
//Mathematics
System.out.println ("Mathematics");
System.out.print ("Average Score: ");
if (totalStudent != 0)
{
AverageSubject = ((double)totalMath)/ ((double)totalStudent);
System.out.print (df.format (AverageSubject));
}
else
{
AverageSubject = 0;
System.out.print ("0.00");
}
System.out.println ();
System.out.println ("Number of passed students: " + passMath);
System.out.println ("Number of failed students: " + failMath);
System.out.println ();
//English
System.out.println ("English");
System.out.print ("Average Score: ");
if (totalStudent != 0)
{
AverageSubject = ((double) totalEnglish)/ ((double)totalStudent);
System.out.print (df.format (AverageSubject));
}
else
System.out.println ("0.00");
System.out.println ();
System.out.println ("Number of passed students: " + passEnglish);
System.out.println ("Number of failed students: " + failEnglish);
System.out.println ();
//Programming
System.out.println ("Programming");
System.out.print ("Average Score: ");
if (totalStudent != 0)
{
AverageSubject = ((double)totalProgramming)/ ((double)totalStudent);
System.out.print (df.format (AverageSubject));
}
else
System.out.println ("0.00");
System.out.println ();
System.out.println ("Number of passed students: " + passProgramming);
System.out.println ("Number of failed students: " + failProgramming);
System.out.println ();
//Overall
System.out.println ("Overall:");
System.out.println ("Number of students who passed all subjects: " + pass4);
System.out.println ("Number of students who passed 3 or more subjects: " + pass3);
System.out.println ("Number of students who passed 2 or more subjects: " + pass2);
System.out.println ("Number of students who passed 1 or more subjects: " + pass1);
System.out.println ("Number of students who failed all subjects: " + failAll);
System.out.println ();
}
}
}
}