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/****************************************************************************
 *	Program Name	:	Student Grant										*
 *	Author			:	David Gillespie										*
 *	Date  			:	18/12/06											*
 *	The program will read in 10 student names and marks from a text document*
 *	The system will ask the user to set grades (i.e A > 80) the program will*
 *	convert the marks into the grades specified by the user and Save it in	*
 *	a .txt file.															*
 ****************************************************************************/
 //Calling function for the program to use to keep size down
 import java.io.*;
 import java.util.*;
 
 public class studentGrant
 {//Start of class Student Grant
 	
 	//set Constant for number of students
 	final static int No_of_Students = 10;
 	
 	//allow input from keyboard
 	static BufferedReader keyboard = new BufferedReader(new InputStreamReader(System.in));
 		
 	//********************Create Records*************************************
 		 static class Student_Grades{
	    String Name;
	    int Mark;
	    Character Grade;
     }//End of record Declaration
 
 
 
 	//********************	Read Marks File	*********************************
 	static boolean readMarksFile (Student_Grades[] Grades)
 	{//read the information from file.  If no file exists then trap it in an error
	   
       //variable declaration section   
  	   boolean FileFound = false;
	   
	   try
	   {//Specify and access chosen file
	   
	      //variable declaration section   
	      StringTokenizer Tokenizer;
	      String Dir_Name ="C:\\Java\\text\\";
	      String File_Name="Marks.txt";
	      File Input = new File(Dir_Name, File_Name);
	
	      String LineInFile, Firstname, Surname;
	   
   	      BufferedReader tempFile = new BufferedReader(new FileReader(Input));		   
  	 
          for(int loop = 0; loop < No_of_Students; loop++)
		  {//Sets Values from Marks Files
             LineInFile = tempFile.readLine();
             Tokenizer = new StringTokenizer(LineInFile);
  	       	 Firstname = Tokenizer.nextToken();
  	       	 Surname =Tokenizer.nextToken();
  	       	 
  	       	 
  	         Grades[loop].Name = (Firstname+" "+Surname);
  	         Grades[loop].Mark = Integer.parseInt(Tokenizer.nextToken());
  	      }//end for
  	 
		  //Tells the calling function the file was found
  	      FileFound = true;
  	    
  	      //Closes the Marks file after use
  	      tempFile.close();
       }//end try
      
       catch(FileNotFoundException error)
       {//Insert Comment Here
          System.err.println(error);
       }//end no file catch
	
	   catch(IOException error)
	   {//Insert Comment Here
          System.err.println(error);
	   }//end ioexception catch
	    
	   finally
	   {//Insert Comment Here
	      return (FileFound);
	   }//end finally
 		
 		
 	}

Code: Select all

 	//******************** Get grade Value	*********************************
 	static int getGradeValue (char gradeName) throws IOException
 	{
 		//declares varible
 		int gradeValue=0;
 		try
 		{
 		
 		System.out.print("Please enter value for "+gradeName+" : ");
 		gradeValue=Integer.parseInt(keyboard.readLine());
 		}
 		
 		catch (NumberFormatException error)
 		{
 			displayErrorMessage("Please enter a Number");
 		}
 		
 		return gradeValue;
 	}
 	
 	//********************Validate Grade Value*******************************
 	static boolean validateGradeValue (int gradeValue, int maxValue)
 	{
 		//declares variables
 		boolean validGrade;
 		
 		if ((gradeValue >= 0)&&(gradeValue<maxValue>=gradeLevels[0])
 			grade = 'A';
 		else
 			if (Mark>=gradeLevels[1])
 				grade = 'B';
 			else
 				if (Mark >= gradeLevels[2])
 					grade= 'C';
 				else
 					if (Mark >= gradeLevels[3])
 						grade ='D';
 					else
 						grade = 'F';
 					//end if
 				//end if
 			//end if
 		//end if
 		return grade;		
 	}
 	
 	//******************Display Menu*****************************************
 	static void displayMenu ()
 	
 	{
 		System.out.println("Welcome to the Student Grades Program\n\n");
 		System.out.println("1.\tDisplay Student Details");
 		System.out.println("2.\tUpdate Student Mark");
 		System.out.println("3.\tExit");
 	}
 	
 	//*******************Get Menu Choice*************************************
 	static int getMenuChoice () throws IOException
 	{
 		//declare variables
 		int menuChoice=0;
 		
 			try
 			{
	 			System.out.print("Please enter a menu Choice : ");
 				menuChoice=Integer.parseInt(keyboard.readLine());
 			}
 			catch (NumberFormatException error)
 			{
	 			displayErrorMessage("Please Enter a valid Number");	
 			}
 			return menuChoice;
 		
 	}
 	
 	//**********************Validate menu Choice*****************************
 	static boolean validateMenuChoice (int menuChoice)
 	{
 		//declare Variables
 		boolean validChoice;
 		
 		if ((menuChoice>=0)&&(menuChoice<=3))
 			validChoice=true;
 		else
 			validChoice=false;
 		//end if
 		
 		return validChoice;
 		
 	}
 	
 	//*****************Get Valid Menu Choice*********************************
 	static int getValidMenuChoice () throws IOException
 	{	//declare variables
 		int menuChoice;
 		boolean validChoice;	
 		
 		do
 		{
 			menuChoice=getMenuChoice();
 			validChoice=validateMenuChoice(menuChoice);
 			if (validChoice==false)
 				displayErrorMessage("Invalid Choice please select 1-3");
 			//end if
 		}while (validChoice == false);
 		//end do while
 		
 		return menuChoice;
 	}
 	
 	//*********************Display Student Details***************************
 	static void displayStudentDetails (Student_Grades[] Grades)
 	{
 		for (int loop =0; loop<No_of_Students; loop++)
 		{
 			System.out.println(""+Grades[loop].Name+" : "+Grades[loop].Grade);
 			
 		}//end for
 		
 	}
 	
 	//*************************Get Student Name******************************

 	static String getStudentName () throws IOException
 	{
 		//declare Variables
 		String name="name";
 		try
 		{
 			System.out.print("Please enter Student Name : ");
 			name = keyboard.readLine();
 		}
 		catch (NumberFormatException error)
 		{
 			displayErrorMessage("Name must not be numbers");
 		}
 		
 		return name;
 		
 	}
 	
 	//***********************Find Student Name*******************************
 	
 	static int findStudentName (String name, Student_Grades[] Grades)
	{
		int elementNumber =0;
		
		
		for (int loop=0 ;loop <No_of_Students; loop++)
		{
			if (name.equals(Grades[loop].Name))
				elementNumber=loop;
		}//end for
		return elementNumber;
	} 	
 	//**********************Update Student Mark******************************
 	static void updateStudentMark (int menuChoice, Student_Grades[] Grades) throws IOException
 	{
 		//declare variables
 		String studentName;
 		int elementNumber,tempMark, mark[] =new int[0];
 		
 		
 		studentName = getStudentName();
 		elementNumber= findStudentName(studentName, Grades);
 		
 		if (elementNumber < (No_of_Students))
 			{
 				try
 				{
 					System.out.print("Please enter a value for Mark ; ");
 					tempMark=Integer.parseInt(keyboard.readLine());
 					mark=new int[tempMark];
 					allocateGrade(Grades[elementNumber].Mark, mark);
 				}
 				catch (NumberFormatException error)
 				{
 					displayErrorMessage("Mark must be a number");
 				}
 			}
 		else
 			System.out.println("Student not Found");
 		//end if	
 	}
 	
 	//*********************Execute Menu Choice*******************************
 	static void executeMenuChoice (int menuChoice, Student_Grades[] Grades) throws IOException
 	{
 		if (menuChoice==1)
 			displayStudentDetails(Grades);
 		else
 			if (menuChoice==2)
 				updateStudentMark(menuChoice, Grades);
 			//end if
 		//end if
 	}
 	
 	//***********************Write grades to file****************************
 	static void writeGradesToFile (Student_Grades[] Grades)
 	{
 		try
	   {//Insert Comment Here
	      String tempString;
	      String Dir_Name ="C:\\Java\\text\\";
	      String File_Name="Grades.txt";
	      File Output = new File(Dir_Name, File_Name);
	       
	      BufferedWriter GradesFile = new BufferedWriter(new FileWriter(Output));		   
  	 	
  	 	  
  	 	  
          for(int loop = 0; loop < No_of_Students; loop++)
		  {//Writes the Information to a line of the text file
		    
             GradesFile.write(Grades[loop].Name + " ");
            
		     GradesFile.write(Grades[loop].Mark + " ");
		     
             GradesFile.write(Grades[loop].Grade + " ");
            

             GradesFile.newLine();
  	      }//end for
  	 
  	      //Closes the file after use
  	      GradesFile.close();
       }//end try
      
       catch(FileNotFoundException error)
       {//Insert Comment Here
       
          System.err.println(error);
          System.out.println("No file was written");
       }//end no file catch
	
	   catch(IOException error)
	   {
          System.err.println(error);
	   }//end ioexception catch	
 		
 	}
 	
 	//**************************Main*****************************************
 	public static void main (String [] args) throws IOException
 	{
 		Student_Grades[] Grades = new Student_Grades[No_of_Students];
 		int gradeLevels[] = new int [4];
 		int maxValue = 100,menuChoice;
 		boolean fileFound=false;
 		
 		// now set up the memory for each Grade object
	   for(int loop = 0; loop <No_of_Students>No_of_Students; loop++)
 				{
 					Grades[loop].Grade = allocateGrade(Grades[loop].Mark, gradeLevels);
 				}//end for
 				do
 				{
 					displayMenu();
 					menuChoice=getValidMenuChoice();
 					executeMenuChoice(menuChoice,Grades);
 					writeGradesToFile(Grades);
 				}while (menuChoice!=3);
 			}//end if
 			
 	}
 }

Code: Select all

//******************Allocate Grade***************************************
	static Character allocateGrade(int Mark, int[] gradeLevels)
	{
		//declare Variables
		Character grade;

		if (Mark >= gradeLevels[0])
			grade = new Character('A');
		else if (Mark >= gradeLevels[1])
			grade = new Character('B');
		else if (Mark >= gradeLevels[2])
			grade = new Character('C');
		else if (Mark >= gradeLevels[3])
			grade = new Character('D');
		else
			grade = new Character('E');
		
		return grade;
	}