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Thread: problem with compiling

  1. #1
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    Default problem with compiling

    public class Unit8
    {
    	public static void main( String [] args )
    	{
     
    		int [] even = new int [ 100 ];
    		int [] odd = new int [ 100 ];
     
    		int randomNum;
     
    		for( int count = 0 ; count < 2 ; count++ )
    		{
    			System.out.println( count );
    			randomNum = (int) (25 * Math.random());
    			displayEvens( randomNum );
    			displayOdds( randomNum );
    		}
     
    	}
     
    	public static void displayOdds( int randomNum )
    	{
    		for( int count = 0 ; count < 100 ; count++ )
    		{
    			randomNum = 1+(int)(25*Math.random());
    			int randArr[m] = 1+(int)(25*Math.random());
    			System.out.println( randArr );
    			if(randomNum / 2 == 1)
    			System.out.println( randomNum );
    		}
     
    	}
     
    	public static void displayEvens( int randomNum )
    	{
     
    		for( int count = 0 ; count < 100 ; count++ )
    			{
    			randomNum = 1+(int)(25*Math.random());
    			int randArr[m] = 1+(int)(25*Math.random());
    			System.out.println( randArr );
    			if(randomNum / 2 == 0)
    			System.out.println( randomNum );
    			} 	
    	}
     
    }
    compile error:

    petes-MacBook-Air:java programs pkrasinski$ javac Unit8.java
    Unit8.java:26: ']' expected
    int randArr[m] = 1+(int)(25*Math.random());
    ------------^
    Unit8.java:26: illegal start of expression
    int randArr[m] = 1+(int)(25*Math.random());
    -----------^
    Unit8.java:41: ']' expected
    int randArr[m] = 1+(int)(25*Math.random());
    ------------^
    Unit8.java:41: illegal start of expression
    int randArr[m] = 1+(int)(25*Math.random());
    -----------^
    4 errors


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: problem with compiling

    Putting a variable type before a variable name makes the statement a definition:
    double varName; //  define a variable of type double

    When defining an array, you don't include the size of the array on the lefthand side of the =.
    The size of the array goes to the right of the =
    int[] anArray = new int[4]; //  define an array with 4 elements
    To assign a value to an element:
    theArray[theIndex] = theValue;

    What are you trying to do?
    If you don't understand my answer, don't ignore it, ask a question.

  3. #3
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    Default Re: problem with compiling

    Write a program that generates 100 random integers in the range 0 to 25, and stores them in an array. Then, the program should call a class method that sorts the odd numbers into an array and another method that sorts the even numbers into a separate array. Both arrays should be displayed.

    Thats the HW

  4. #4
    Super Moderator Norm's Avatar
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    Default Re: problem with compiling

    Did you fix the errors?
    If you don't understand my answer, don't ignore it, ask a question.

  5. #5
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    Default Re: problem with compiling

    no I'm not sure how to do that in this case

  6. #6
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    Default Re: problem with compiling

    I tried to say what the problem was and how to fix in in post #2.

    What parts of that don't you understand? Be explicit, don't say all of it.

    int randArr[m] = 1+(int)(25*Math.random());
    What is that statement supposed to do?


    To assign a value to an element in an array:
    theArray[theIndex] = theValue;
    If you don't understand my answer, don't ignore it, ask a question.

  7. #7
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    Default Re: problem with compiling

    nvm my new compile error was just a typo. i got what you said but i still got an error all b/c of a typo. thanks

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