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Thread: Help with array

  1. #1
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    Default Help with array

    Hello ,

    basically i want to write a program to compare 2 answer like the first line is the answer key and all the other lines are the students Id , and answer
    like so :

    TFTFTFTFTFTFTFTFTFTF
    6185 TFTFTFTFTFTF FTFT TF
    64551 TFFTFTTTTTTFFTFTTTTTF

    I know how to put the answer key in a array but do not know how to compare it the all of the other students response also a right answer is +2 , wrong -1 , and blank 0 .

    I know how to write the program but do not know how to to compare I thought about using a if else statement then I realize it was a bad idea , the answer key might change and the result will not be accurate ; and would like to use a array , that what I had .

    if (studentsAnswers[1].charAt(0) == 'F' ){
          counter0 = counter0 + 1;
       }else{
     
     
       if (studentAnswers[1].charAt(1) == 'T'){
          counter1++;
       }else{
            }
     
     
       if (studentsAnswers[1].charAt(2) == FT'){
          counter2++;
       }else{
            }

    I really need some help here guys If someone can help me please do .

    Thanks a lot


  2. #2
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    Default Re: Help with array

    You will need 2 loops. One to loop through students and one to loop through (and compare) the answers.
    Improving the world one idiot at a time!

  3. #3
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    Default Re: Help with array

    Junky ,
    can you please show me how to do it , I am a beginner and don't want to messed up
    Thanks

  4. #4
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    Default Re: Help with array

    Do you know how to write a loop?
    Do you know how to access an element of an array?
    Do you know how to write if statements?
    Do you know how to declare variables?
    Do you know how to increment/change the value of variables?

    Then you know how to do this. Make an attempt and if you get stuck post your code and ask a specific question. Include error messages if you get them.
    Improving the world one idiot at a time!

  5. #5
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    Default Re: Help with array

    Additional to Junky's answer.
    1. Why don't you read String? Will ease your problem.
    2. Well, if you are restricted to use char array, Junky's post is useful to lead you to the solution.

  6. #6
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    Default Re: Help with array

    Thanks for your response I decided to redo everything from the beginning and I am pretty much stuck there :

    int[] studentID = new int[maxStudent];
    	char [] Answer = new char [19];
     
    	Scanner inFile = new Scanner (new FileReader("C:\\students.txt"));
    	PrintWriter outfile = new PrintWriter("C:\\studentsout.txt");
     
    int noOfStudents = 0;
    	while(inFile.hasNext() && noOfStudents <250){
    	studentID[noOfStudents] = inFile.nextInt(); 
    	Answer[noOfStudents]=inFile.next().charAt(6);
    	noOfStudents++;

    What I need to do next ? I really don't know I have been working on it since yesterday and could not get anything done.

  7. #7
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    Default Re: Help with array

    @jeremy: Atleast i couldn't understand what do you need to do? Or what you want to do?
    Well, i will suggest you reading this!!!

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