Write a Java Program to Read in a Data File, Calculate Grade Info

tracydo 17 Junior Poster in Training

10 Years Ago

I spent so much time from scratch to finish and to the point that I couldn't figured out what is all my mistakes about. I need a fresh set of eye, may you help? (errors at the bottom, sorry for have to scroll down the long page) Thanx

              /* *Description: Writing own method, Switch Selection Control, String,Accumulating,  *Counting method, array base on last reviews from previous labs. *prepare a grade report for more than 1 student using input File and *output to a File with print outs letter grades # of A's, B's etc. *Input: College Name, Student Name, Student ID Number and *Courses-Section Name (ex. CISC115.59), Letter Grades   *Output: College Name, Student Name, Student ID Number;   *Courses, Letter Grades, Grade Points, GPA and total students grades.  */   import java.io.*; //Needed for File classes import java.util.*; //Needed for scanner classes     public class gpa { 	public static void main(String[] args)throws Exception 	{									 					 		// declare inFile & associate with actual data file 		Scanner inFile = new Scanner(new FileReader("inputgpa.txt")); 		 		//Read numStudents from first line of inputgpa file 		int numStudents = inFile.nextInt(); //total number of students 		 		// declare outFile & associate with actual data file 		PrintWriter outFile = new PrintWriter("outputgpa.txt"); 		 		//Print College name to file 		outFile.println("BCCC"+"Grade Report for "+ numStudents+"students"); 				  		// Continue if there is more data in inputgpa file 		while (inFile.hasNext()) 		{ 			//Read Name & idNumber from inputgpa file 			String Name = inFile.nextLine(); // student name in file 			int idNumber = inFile.nextInt(); //student ID number 			 			// Output to file 			outFile.println("\t\t\t"+Name); 			outFile.println("\t\t\t"+idNumber); 			 			//print 1 blank line 			outFile.println(); 			 			//Write to file for headings  			outFile.println("Couse\t\t"+"Grade\t\t"+"Gradepoints"); 			 			//Call studentCourses method for student gp & gpa calculation 			studentCourses(); 			 		}//End While loop then close the inputgpa file 		inFile.closed(); 		 	}//End Main method 	 	 	/** ___________________________________________________________ 	 This loop for colecting the 6 courseName and their letGrade of 	 each student from the inputgpa file, then calculate the gp & gpa 	 */ 	 public static void studentCourses() 	 { 	 	//continue read from inputgpa file 		while(inFile.hasNext()) 		{ 			//Declare variable n & its value 			int n = 6; //total of student courses 			int i=0;  			//start loop 			for(i=0; i<n; i++) 			{ 				//read courseName 				String courseName = inFile.nextLine(); 				String letGrade = inFile.nextLine(); 			 				//Pass the array to the gradeSortout method 				gradeSortout(); 				 				double gp=0.0; // grade point 			 				//compute gp from input letGrade 				switch(letGrade) 				{ 					case 'A': gp=4; break; 					case 'B': gp=3; break; 					case 'C': gp=2; break; 					case 'D': gp=1; break; 					case 'F': gp=0; break; 					default: System.out.println("Invalid Grade"); break; 				}//End switch loop 			 			//compute to find total gradepoints 			double totalgp = 0.0; 			totalgp+= gp; 			 			//Read values then output to outputgp file 			outFile.println(courseName+"\t\t"+letGrade+"\t\t"+gp); 			}//End For loop 			 			//Compute gpa 			double gpa = 0.0; 			gpa = totalgp / n; 			 			//Read gpa and output to outputgpa file 			//print line 			outFile.println("-------------------------------"); 			 			//display gpa as footer 			outFile.println("GPA: "+gpa); 			 	 	}//End While loop 	}//End studentCourses method 	 	// ___________________________________________________________________ 	//Begin gradeSortout method    	 	public static void gradeSortout() 	{ 		// declare outGrade & associate with actual data file 		PrintWriter outGrade = new PrintWriter("Grade.txt"); 		 		//Print to Grade file 		outGrade.println("BCCC"+"Grade Results Report of "+ numStudents+"students "+"- Spring 2011-"); 		 		//calculate the total grades of all students for array uses 		int sum = numStudent*n; 		int[]gradeArray = new int[numStudent*n]; 		int j=0; 		 		//start loop for gradeSortout 		for(j=0; j<sum; j++) 		{ 			gradeArray[j] = 0; 			 			switch(letGrade) 			{ 				case'A':outGrade.format(format,(j+1)+"A"); break; 				case'B':outGrade.format(format,(j+1)+"A"); break; 				case'C':outGrade.format(format,(j+1)+"A"); break; 				case'D':outGrade.format(format,(j+1)+"A"); break; 				case'F':outGrade.format(format,(j+1)+"A"); break; 				default:outGrade.println("invalid grade"); break; 			} 			 			//print to Grade file in table layout 			outGrade.println("________________________________________"); 			outGrade.println();//one blank line 			 			String format = "%1$-10s%2$-10s%3$-10s%4$-10s%5$-10s%6$-10s\n"; 			 			//print headings 			outGrade.format(format,"Number","A Grade", "B Grade", "C Grade", "D Grade", "F Grade"); 			 			  		}//End for loop		 		 	}//End gradeSortout method 	 }//End            

              symbol  : variable inFile location: class gpa 		while(inFile.hasNext()) 		      ^ gpa.java:82: cannot find symbol symbol  : variable input location: class gpa 				String courseName = input.nextLine(); 				                    ^ gpa.java:83: cannot find symbol symbol  : variable input location: class gpa 				String letGrade = input.nextLine(); 				                  ^ gpa.java:86: gradeSortout(int[]) in gpa cannot be applied to () 				gradeSortout(); 				^ gpa.java:91: incompatible types found   : java.lang.String required: int 				switch(letGrade) 				       ^ gpa.java:106: cannot find symbol symbol  : variable outFile location: class gpa 			outFile.println(courseName+"\t\t"+letGrade+"\t\t"+gp); 			^ gpa.java:111: cannot find symbol symbol  : variable totalgp location: class gpa 			gpa = totalgp / n; 			      ^ gpa.java:115: cannot find symbol symbol  : variable outFile location: class gpa 			outFile.println("-------------------------------"); 			^ gpa.java:118: cannot find symbol symbol  : variable outFile location: class gpa 			outFile.println("GPA: "+gpa); 			^ gpa.java:134: cannot find symbol symbol  : variable numStudents location: class gpa 		outGrade.println("BCCC"+"Grade Results Report of "+ numStudents+"students "+"- Spring 2011-"); 		                                                    ^ gpa.java:137: cannot find symbol symbol  : variable numStudent location: class gpa 		int sum = numStudent*n; 		          ^ gpa.java:137: cannot find symbol symbol  : variable n location: class gpa 		int sum = numStudent*n; 		                     ^ gpa.java:138: cannot find symbol symbol  : variable numStudent location: class gpa 		int[]gradeArray = new int[numStudent*n]; 		                          ^ gpa.java:138: cannot find symbol symbol  : variable n location: class gpa 		int[]gradeArray = new int[numStudent*n]; 		                                     ^ gpa.java:146: cannot find symbol symbol  : variable letGrade location: class gpa 			switch(letGrade) 			       ^ gpa.java:148: cannot find symbol symbol  : variable format location: class gpa 				case'A':outGrade.format(format,(j+1)+"A"); break; 				                        ^ gpa.java:149: cannot find symbol symbol  : variable format location: class gpa 				case'B':outGrade.format(format,(j+1)+"A"); break; 				                        ^ gpa.java:150: cannot find symbol symbol  : variable format location: class gpa 				case'C':outGrade.format(format,(j+1)+"A"); break; 				                        ^ gpa.java:151: cannot find symbol symbol  : variable format location: class gpa 				case'D':outGrade.format(format,(j+1)+"A"); break; 				                        ^ gpa.java:152: cannot find symbol symbol  : variable format location: class gpa 				case'F':outGrade.format(format,(j+1)+"A"); break;            

Edited 10 Years Ago by peter_budo because: Keep It Clear - Do wrap your programming code blocks within [code] ... [/code] tags

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Write a Java Program to Read in a Data File, Calculate Grade Info

Source: https://www.daniweb.com/programming/software-development/threads/360310/read-write-to-file-for-grades-needed-help

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