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Thread: Illegal Start of Expression Error. Any help is appreciated.

  1. #1
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    Default Illegal Start of Expression Error. Any help is appreciated.

    Hello everyone at JavaProgrammingForums!

    I am brand new to Java and any help regarding this seemingly basic problem that I've encountered would be greatly appreciated. Thanks, in advance!

    I'm trying to write an array within the class MyArray which is used in a separate main class.

    I'm getting an "illegal start of expression" error at line 5. The arrow indicating where the error lies is pointing to the closing parentheses of the for loop.

    I haven't encountered this error until now so i'm really not too sure what to do. Here's the code:

    public class MyArray {
      int i;
     
    MyArray () {
      double array[] = new double[MAX];
     
      for (i=0; i<MAX; i=++) {
         system.out.println("what number");
         double num = Double.parseDouble(in.readLine());
    			array[i] = num;
    }
    }
    }

    Again, thanks in advance,

    Sam


  2. #2
    Super Moderator helloworld922's Avatar
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    Default Re: Illegal Start of Expression Error. Any help is appreciated.

    The first issue I can see is that the MAX variable isn't declared or initialized anywhere. I would change your constructor to take an integer and use that to construct the appropriate sized array. Secondly, it's very bad practice to have the loop counter as an object field as you have it there (though, this wouldn't give any compile/running errors). Use a local variable for such a simple task as this. Conversely, you'll probably want the double array to stick around, so I would put that as a field. The last issue is you're trying to use in.nextLine(), but you haven't declared or initialized what in is. I'm guessing you want a Scanner object.

    import Java.util.Scanner;
     
    public class MyArray
    {
         double array[];
     
         MyArray(int max)
         {
              array[] = new double[max];
              Scanner in = new Scanner(System.in);
              for (int i = 0; i < max; i++)
              {
                   System.out.println("What number");
                   double num = Double.parseDouble(in.nextLine());
                   array[i] = num;
              }
         }
    }

  3. The Following User Says Thank You to helloworld922 For This Useful Post:

    SKhoujinian91 (December 8th, 2009)

  4. #3
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    Default Re: Illegal Start of Expression Error. Any help is appreciated.

    Thank you! Your solution did exactly what was needed!

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