Changing array I think and the print statement

[mike statham]

I want to change from Syste.out.printf() too println() on main program.

I also want to have not to rely on just five records in afile, have the ooption of having five or a 1000 without having to set the field vaule, is these possible?

 import java.io.FileReader;
import java.util.Scanner;

public class Grades {
	static public void main(String[] args) throws Exception {
	
		int avg = 0;
		Scanner input = new Scanner(new FileReader("grades.txt"));
		
		int[] numGrade = new int[5];
		String[] name = new String[5]; // stores name of each student
		int[] avgMarks = new int[5]; // stores avg marks of each student
		String[] letterGrade = new String[5]; // stores grade of each student
		int totalMarks =0;  // stores total marks 
		
		for (int i = 0; i < 5; i++) {
			name[i] = input.next();
			avg = 0;
			for (int j = 0; j<3; j++) {				
				numGrade[j] = input.nextInt();			
				avg += numGrade[j];
				if (j == 2) {
					avgMarks[i] = avg/3;
					totalMarks += avgMarks[i];
				}	
			}
		
		}
		
		// get the grade 
		
		for (int i=0; i<5; i++) {
                    
                                if (avgMarks[i] < 60) {
				letterGrade[i] = "F";
            
			}	else if (avgMarks[i] < 70) {
				letterGrade[i] = "D";
            
			}	else if (avgMarks[i] < 80) {
				letterGrade[i] = "C";
            
			}       else if (avgMarks[i] < 90){
				letterGrade[i] = "B";
            
			}       else {
				letterGrade[i] = "A";
                                }
		}
			
		for (int i = 0; i<5; i++) {
			System.out.printf("%s\t has an average grade of  %d%%.  You will receive a %s in this class. \n", name[i], avgMarks[i], letterGrade[i]);
		}
		
		System.out.printf("\nOverall Class Average is %d%%.",totalMarks/5);
      
      
      
      //generates three random integers between 0 and 50, calculates the average?
      int one,two,three;
      one=(int)(Math.random()*(51));
      two=(int)(Math.random()*(51));
      three=(int)(Math.random()*(51));

      int average=(one+two+three)/3;

      System.out.println("\n\nThe average of\t"+one+"  "+two+"  "+three+"\n\n is "+average);

      
      
	}
	
} 

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[Winston Gutkowski]

mike statham wrote:I want to change from Syste.out.printf() too println() on main program.

So do it. I don't understand the question.

I also want to have not to rely on just five records in afile, have the ooption of having five or a 1000 without having to set the field vaule, is these possible?

Yes. Have a look at ArrayList.

BTW, please split up that enormous line in your code. It really screws up the windowing software here.

Winston

[Campbell Ritchie]

Why haven’t you got a Student class which encapsulates name and marks? Trying to run two arrays in parallel is error-prone and not good design.
You can have as many lines as you like, but they are a lot easier to add to a List than to an array.
Keep printf(); it is more versatile than println().