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POBeginning Java (Histogram)
 

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    <p>I'm taking a beginner Java class, with the assignment to create a histogram program with the following output: (100 and 10 are user inputs).</p> <p>How many numbers? 100 How many intervals? 10</p> <pre><code>Histogram -------------------------------------------------------- 1 ****(4) 2 ******(6) 3 ***********(11) 4 *****************(17) 5 **************************(26) 6 *************************(25) 7 *******(7) 8 ***(3) 9 (0) 10 *(1) -------------------------------------------------------- </code></pre> <p>My code is giving the following output however, can anyone help me point out what is going wrong, thanks so much.</p> <pre><code>How Many Numbers? 10 How Many Intervals? 10 Histogram -------------------------------------------------------- 1 **********(10) 2 **********(10) 3 **********(10) 4 **********(10) 5 **********(10) 6 **********(10) 7 **********(10) 8 **********(10) 9 **********(10) 10 **********(10) </code></pre> <p>For the input, 100 and 10 I get the error message:</p> <blockquote> <p>Exception in thread "main" java.lang.ArrayIndexOutOfBoundsException: 10 at Lab6.main(Lab6.java:44) I marked Line 44 below. </p> </blockquote> <p>Which links to this code;</p> <pre><code> intervalValue[j]++; </code></pre> <p>I'm not sure how to attach the generator (.jar) file, it is supposed to just generate the random #'s for us. Thanks again.</p> <pre><code>mport java.util.Scanner; public class Lab6 { public static void main(String[] args) { int numbers, intervals; double intervalWidth; double max, mins, range; Scanner keyboard = new Scanner(System.in); System.out.print("How Many Numbers? "); numbers = keyboard.nextInt(); System.out.print("How Many Intervals? "); intervals = keyboard.nextInt(); double [] generate = new double[numbers]; generate = randomGenerator(numbers); max = maximum(generate); mins = minimum(generate); range = max - mins; intervalWidth = range / intervals; int [] intervalValue = new int[intervals]; for (int i=0; i &lt; generate.length; i++) { for (int j = 0; j&lt;generate.length; j++){ double imin = mins+j*intervalWidth; double imax = max +j*(intervalWidth); if(generate[i] &gt;= imin &amp;&amp; generate[i] &lt; imax) intervalValue[j]++; //LINE 44 } } System.out.println("Histogram"); System.out.println("--------------------------------" + "------------------------"); for (int a=0; a &lt; intervalValue.length; a++) { System.out.print(" " + (a+1) + " "); for (int b=0; b &lt; intervalValue[a]; b++) { System.out.print("*"); } System.out.println("(" + intervalValue[a] + ")"); } } private static double [] randomGenerator(int number) { double [] generate; generate = Generator.getData(number); return generate; } private static double maximum(double [] a) { double max = a[0]; for (int i = 1; i &lt; a.length; i++) { if (a[i] &gt; max) { max = a[i]; } } return max; } private static double minimum(double [] a) { double mins = a[0]; for (int i = 1; i &lt; a.length; i++) { if (a[i] &lt; mins) { mins = a[i]; } } return mins; } } </code></pre>
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    1. COUnfortunately I can't compile it without your generator class.
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    2. COand you might want to consider using a code formatter (eclipse has one built in) also don't try to post binary files' content. It doesn't help :)
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