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Thread: Have user enter in 2 inputs instead of using -1 to end. Help appreciated!

  1. #1
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    Default Have user enter in 2 inputs instead of using -1 to end. Help appreciated!

    Hey guys im writing a program that determines your grade here is the code so far.
     
    		Scanner s = new Scanner(System.in);
    	String [ ]  name = new String [3];
    	int [ ] score =  new int [10];
    	char [ ] grade = new char [10];
    	int i =0;
    	do {
    	System.out.print("Enter student's Last name: ");
    	name[i] = s.nextLine();
    	System.out.print("Enter student's score: ");
    	score[i] = Integer.parseInt(s.nextLine());
    		System.out.print("Enter student's score: ");
    	score[i] = Integer.parseInt(s.nextLine());
    		System.out.print("Enter student's score: ");
    	score[i] = Integer.parseInt(s.nextLine());
    		System.out.print("Enter Final Exam score: ");
    	score[i] = Integer.parseInt(s.nextLine());
     
    	if (score[i] != -1)
    		i++;
    	}  while (score[i] != -1 &&  i<10);
     
    	for (int j=0; j<i; j++) {
    	if (score[j] >= 90)
    		grade[j] = 'A';
    	else if (score[j] >= 80)
    		grade[j] = 'B';
    	else if (score[j] >= 70)
    		grade[j] = 'C';
    	else if (score[j] >= 60)
    		grade[j] = 'D';
    	else
    		grade[j] = 'F';
    	} // end for
     
    	System.out.println("\nName\t\tScore\t\tGrade");
    	for (int j=0; j<i; j++)
    		System.out.println(name[j]+"\t\t"+score[j]+"\t\t"+grade[j]);
     
     } // end main
    } // end class

    instead of having the user put in -1 to end the inputs of the grades I'm trying to figure out how to just have 2 students put in there grades and be done with it.

    Thanks for your help


  2. #2
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    Default Re: Have user enter in 2 inputs instead of using -1 to end. Help appreciated!

    Simply remove the condition -1 to terminate the loop.

  3. #3
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    Default Re: Have user enter in 2 inputs instead of using -1 to end. Help appreciated!

    If I understand you correctly, originally you wanted it to keep adding new students and their score until a user input-1,
    but now you want it to just ask twice(two students) and finish running the program. (printing two students)

    Currently you have:
    do {
    	//stuff
     
    	//increment loop
    	if (score[i] != -1) // you check if you have to increment.(VERY BAD PRACTICE. Ask your teacher why)
    		i++;
     
    }  while (score[i] != -1 &&  i<10);
     
    for (int j=0; j<i; j++) {
     
    	//use data from 1 array to fill another(slightly altered)
     
    } // end for
     
    	// print chart titles
     
    	for (int j=0; j<i; j++)
    	// print scores
     
    } // end for

    You want to change the end condition from a -1 flag to asking just twice.
    your first do loop used -1 condition other then that, nothing changes.

    So, to be proper, change your do/while to a standard for loop that uses i to increment and ends after its asked twice.
    make sure to clear that if statement that you used to increment your do/while loop.

    Hope this helps,
    Jonathan
    Last edited by JonLane; February 21st, 2012 at 04:34 PM.

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    Default Re: Have user enter in 2 inputs instead of using -1 to end. Help appreciated!

    @JonLane: Kindly wrap your code in code tags.

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