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Thread: Am I generating an infinite loop?

  1. #1
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    Post Am I generating an infinite loop?

    EDIT: Fixed the code a little so the loop part isn't an issue, issue now is that the average isn't generating
    The purpose of this program is to run an experiment of multiple trials seeing how many squirrels you see before seeing a fox squirrel.
    import java.io.IOException;
    import java.io.PrintWriter;
    import java.io.File;
    import java.util.Scanner;
    import java.util.Random;
    class Main {
      public static void main(String[] args) throws IOException {
        Scanner input = new Scanner(System.in);
        File fileName =  new File("squirrel.txt");
        Scanner inFile = new Scanner(fileName);
        PrintWriter outFile =  new PrintWriter(new File("squirrel.txt"));
        Random ran = new Random();
        System.out.println("Welcome to the Fox Squirrel Simulator");
        System.out.println();
        System.out.println("How many trials should be simulated?");
        System.out.println("Please enter a number greater than 1000: ");
        int trialNum = input.nextInt();
        if (trialNum < 1000) {
          System.out.println("\tError, please try again.");
          System.out.println("How many trials should be simulated?");
          System.out.println("Please enter a number greater than 1000: "); 
        trialNum = input.nextInt();
        } 
        int initialTrialNum = trialNum;
        System.out.println("trialNum is " + trialNum);
        System.out.println();
        System.out.println("Simulating trials, please wait...");
        int squirrelsSeen;
        int foxSquirrel;
        int trialsDone;
        for (trialsDone = 1; trialsDone <= trialNum; trialsDone++) {
          squirrelsSeen = 0;
          for(foxSquirrel = 0; !(foxSquirrel == 10); squirrelsSeen++) {
            foxSquirrel = ran.nextInt(11);
          }
          outFile.println(squirrelsSeen);
          System.out.println(squirrelsSeen);
        }
        String token = "";
        int sum = 0;
        int fileInt = 0;
        while(inFile.hasNext()) {
          token = inFile.next();
          fileInt = Integer.parseInt(token);
          sum += fileInt;
        }
        double average = (double)sum/(double)initialTrialNum;
        System.out.println("The results! The average number of squirrels \n saw until a fox squirrel was spotted is: " + average);
      }
    }
    I am getting no output from the average, it is giving me a value of 0.0. I use repl.it to compile, does that affect it from writing into the text file? I have the text file created in the same folder as the repl.it.
    Last edited by bamboozled40; September 10th, 2019 at 08:40 PM.

  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Am I generating an infinite loop?

    I assume there is something wrong with the for loops that is causing it to get stuck in an infinite loop.
    Add some debugging print statements to the loops that print out the value of the variables that controls the looping. The print out should show you what is happening.
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
    Super Moderator Norm's Avatar
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    Default Re: Am I generating an infinite loop?

    it is giving me a value of 0.0
    What variable contains that value of 0? Where is the code that should change the value in that variable?
    Is the code that is supposed to change the variable's value being executed?
    If you don't understand my answer, don't ignore it, ask a question.

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