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Thread: array question

  1. #1
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    Cool array question

    How do I store the first number from a file and use it to make an array of that number?

    ex:
    5 //want to store this number
    1 2 3 4 5 // and loop to see if this is an array of 5.

  2. #2
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    First things first... do you know how to read a text file? Do you know how you would you get that first line to begin with?

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    Yes i know how to read from a file and get it to print out the integers, but I am not very good with arrays. I don't know how to make it read the first integer and store it with out storing it into an array. I hope that makes since=)

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    This is what I ave so far, but it is spitting out random yes's and no's.

    import java.util.*;
    import java.io.*;

    import static java.lang.System.out;

    public class Squares {

    public static void main(String[]args)
    {
    int square;
    int matrix [][]= new int [64][64];
    int counter=1;
    int n;

    Scanner filename = new Scanner(System.in);

    out.print("Enter file name: ");
    String inputfilename = filename.nextLine();

    out.print("Enter output name: ");
    String outputfilename = filename.nextLine();

    out.println();


    try
    {
    File inputFile = new File(inputfilename);
    File outputFile = new File(outputfilename);

    filename = new Scanner(inputFile);

    out.println("Square #"+counter+":" );

    while(filename.hasNextInt())
    {
    square = filename.nextInt();


    for(int i=1; i<= square; i++)
    {
    for(int j=0; j <= square; j++)
    {
    matrix[i][j]=((i+1)+j)%square;

    if (matrix[i][j] == 0)
    {
    out.println("Yes!");
    }
    else
    {
    out.println("no");
    }

    }
    }


    counter++;

    }
    }
    catch(FileNotFoundException e)
    {
    out.print("File not found!");
    }
    }


    }

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