Array Syntax exception | Java Community | Help. Code. Learn. | Page 1

ripe gazelle Oct 14, 2022, 12:16 PM

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There is an error for Standard Deviation, and the values are error on Sum and Mean too

rocky mango Oct 14, 2022, 12:17 PM

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helllo

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any code there?

ripe gazelle Oct 14, 2022, 12:18 PM

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import java.util.Scanner;
public class StandardDeviation {
    public static void main(String [] args) {
        //Declare Numbers
        double ansOutput;
        double valueNum[] = new double[10];
        double numInput = 0;
        Scanner keyInput = new Scanner(System.in);
        int numN = 0;
        //Question and Declare Values
        System.out.println("Enter negative value to end the input section!");
        for (int ansCount=1; ansCount<=10; ansCount++){
            System.out.print("Please enter the value: ");
            ansOutput = keyInput.nextDouble();
            if (ansOutput < 0)
            break;
            valueNum[ansCount] = ansOutput;
            numN++;
        }
        //Calculation (Sum of value)
        double sumResult = 0;
        for (int sumCount = 0; sumCount < valueNum.length; sumCount++) {
            sumResult += valueNum[sumCount];
        }
        System.out.println("Sum = "+sumResult);
        //Calculation (Mean value)
        double meanResult = 0;
        meanResult = sumResult / numN;
        System.out.println("Mean = "+meanResult);
//(Maximum and Minimum section, omitted)
        //Calculation (Standard Deviation)
        double standardDeviationResult = 0;
        double devResult = 0;
        double devPlusResult = 0;
        if (numN <= 1)
            System.out.println("Standard Deviation = NaN");
        else {
            for (int devCount = 0; devCount < numN; devCount++) {
                valueNum[devCount] = Math.pow(valueNum[devCount]-meanResult, 2);
            }
            for (int devPlusCount = 0; devPlusCount < numN; devPlusCount++) {
                devPlusResult = valueNum[devPlusCount] + valueNum[devPlusCount-1];
            }
            devResult = devPlusResult/(numN-1);
            standardDeviationResult = Math.sqrt(devResult);
            System.out.println("Standard Deviation = "+standardDeviationResult);
        }
    }
}

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Original Question

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wait a sec

rocky mango Oct 14, 2022, 12:24 PM

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which is the 75th line

ripe gazelle Oct 14, 2022, 12:31 PM

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rocky mango Oct 14, 2022, 12:38 PM

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        for (int ansCount=1; ansCount<=10; ansCount++){
            System.out.print("Please enter the value: ");
            ansOutput = keyInput.nextDouble();
            if (ansOutput < 0)
            break;
            valueNum[ansCount] = ansOutput;
            numN++;
        }

problem with this is anscount is 1 and the starting of array is 0 not 1

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        for (int i=0; i<10; i++){
            System.out.print("Please enter the value: ");
            ansOutput = keyInput.nextDouble();
            if (ansOutput < 0)
            break;
            valueNum[i] = ansOutput;
        }

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this is corent

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correct

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it will do for 10 times and it will asign to correct array index

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any array first index is 0

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so last will be its size minus 1

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            for (int devPlusCount = 0; devPlusCount < numN; devPlusCount++) {
                devPlusResult = valueNum[devPlusCount] + valueNum[devPlusCount-1];
            }

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error is in here

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because ua re doing 0-1 for first time in loop so arrayoutofindex exceoption throwing

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            for (int devPlusCount = 0; devPlusCount < numN-1; devPlusCount++) {
                devPlusResult = valueNum[devPlusCount+1] + valueNum[devPlusCount];
            }
``` this will fix it maybe because it will take devPlusCount < numN-1 as the stop point in for loop and its doing plus the valuenum[devcount+1]

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       for (int devPlusCount = 1; devPlusCount < numN; devPlusCount++) {
                devPlusResult = valueNum[devPlusCount] + valueNum[devPlusCount-1];
         }

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this will work too its taking the starting devpluscount as 1

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now u can close this if its solved

ripe gazelle Oct 14, 2022, 12:53 PM

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The values are not correct

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1.458 and 1.466 🤔

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not completely solved

rocky mango Oct 14, 2022, 12:57 PM

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i think so its probelm of precistion

ripe gazelle Oct 14, 2022, 12:57 PM

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?

rocky mango Oct 14, 2022, 12:57 PM

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presizion

ripe gazelle Oct 14, 2022, 12:57 PM

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how to solve this issue

rocky mango Oct 14, 2022, 1:07 PM

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or maybe code bug

rocky mango Oct 14, 2022, 1:08 PM

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ripe gazelle 1.458 and 1.466 🤔

are the sum and other thigns coming correct other then deviation

ripe gazelle Oct 14, 2022, 1:09 PM

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Sum and Mean are errored

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        //Calculation (Sum of value)
        double sumResult = 0;
        for (int sumCount = 0; sumCount < valueNum.length; sumCount++) {
            sumResult += valueNum[sumCount];
        }
        System.out.println("Sum = "+sumResult);
        //Calculation (Mean value)
        double meanResult = 0;
        meanResult = sumResult / numN;
        System.out.println("Mean = "+meanResult);

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Original Code

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hi?

rocky mango Oct 14, 2022, 1:13 PM

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ripe gazelle Sum and Mean are errored

oh

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can u send full code

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new one

ripe gazelle Oct 14, 2022, 1:14 PM

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📎 Code.txt

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idk why "0.1+0.2≠0.3" happens

rocky mango Oct 14, 2022, 1:15 PM

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wow u didnt changed anything i said

ripe gazelle Oct 14, 2022, 1:15 PM

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?

rocky mango Oct 14, 2022, 1:15 PM

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rocky mango ``` for (int i=0; i<10; i++){ System.out.print("Please enter...

t

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just check up

rocky mango Oct 14, 2022, 1:15 PM

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rocky mango t

change to ths

ripe gazelle Oct 14, 2022, 1:15 PM

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rocky mango ``` for (int i=0; i<10; i++){ System.out.print("Please enter...

tbh why this affects

rocky mango Oct 14, 2022, 1:16 PM

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i said u

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u are doing i = 1

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array has 0th index too

ripe gazelle Oct 14, 2022, 1:16 PM

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rocky mango Oct 14, 2022, 1:16 PM

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his = {hello,hi,hiii}
his[0] will be hello

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is it working now??

ripe gazelle Oct 14, 2022, 1:17 PM

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no

rocky mango Oct 14, 2022, 1:17 PM

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sum also not working??

ripe gazelle Oct 14, 2022, 1:17 PM

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btw correct answer of Standard Deviation would be this (by Calculator)

ripe gazelle Oct 14, 2022, 1:17 PM

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rocky mango sum also not working??

yep

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both Sum and Mean

rocky mango Oct 14, 2022, 1:18 PM

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can u send new code again

ripe gazelle Oct 14, 2022, 1:18 PM

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📎 message.txt

rocky mango Oct 14, 2022, 1:20 PM

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how can sum be wrong

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are u sure its wrong??

ripe gazelle Oct 14, 2022, 1:22 PM

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ripe gazelle

.

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why the sum isn't "7.41" but "7.409999999999999"

rocky mango Oct 14, 2022, 1:22 PM

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ripe gazelle

bruh sum is working??

ripe gazelle Oct 14, 2022, 1:22 PM

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?

rocky mango Oct 14, 2022, 1:22 PM

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does that matter??

ripe gazelle Oct 14, 2022, 1:22 PM

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yes

rocky mango Oct 14, 2022, 1:23 PM

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so it should be formatted to 0.00

ripe gazelle Oct 14, 2022, 1:24 PM

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still ducked-up

rocky mango Oct 14, 2022, 1:24 PM

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DecimalFormat form = new DecimalFormat("0.00");
System.out.println(form.format(0.1292));
this will print 0.13

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take hthis

ripe gazelle Oct 14, 2022, 1:25 PM

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rocky mango DecimalFormat form = new DecimalFormat("0.00"); System.out.println(form....

where should it put

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and there are various numbers

rocky mango Oct 14, 2022, 1:25 PM

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declare decimal fomrat above and when print numbers use form.format(num)

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📎 message.txt

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take

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i added to every system.println

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if u dont want soem to be formatted remove form.form from it

ripe gazelle Oct 14, 2022, 1:30 PM

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rocky mango Oct 14, 2022, 1:30 PM

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add import

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import java.text.DecimalFormat;

ripe gazelle Oct 14, 2022, 1:30 PM

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?

rocky mango Oct 14, 2022, 1:31 PM

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add the import

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at starting

ripe gazelle Oct 14, 2022, 1:33 PM

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Wrong value at "Standard Deviation"

ripe gazelle Oct 14, 2022, 1:33 PM

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ripe gazelle btw correct answer of Standard Deviation would be this (by Calculator)

.

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do you know how to calculate it correctly

rocky mango Oct 14, 2022, 1:34 PM

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no

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idk

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one sec

ripe gazelle Oct 14, 2022, 1:34 PM

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rocky mango Oct 14, 2022, 1:35 PM

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ripe gazelle Oct 14, 2022, 1:36 PM

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erm

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so...

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it is a big error

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//Calculation (Standard Deviation)
        double standardDeviationResult = 0.00;
        double devPlusResult = 0.00;
        if (numN <= 1)
            System.out.println("Standard Deviation = NaN");
        else {
            for (int devCount = 0; devCount < numN; devCount++) {
                valueNum[devCount] = Math.pow(valueNum[devCount]-meanResult, 2);
            }
            for (int devPlusCount = 1; devPlusCount < numN; devPlusCount++) {
                devPlusResult = valueNum[devPlusCount] + valueNum[devPlusCount-1];
            }
            standardDeviationResult = Math.sqrt(devPlusResult/(numN-1));
            System.out.println("Standard Deviation = "+form.format(standardDeviationResult));
        }

rocky mango Oct 14, 2022, 1:39 PM

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ripe gazelle Oct 14, 2022, 1:41 PM

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?

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oh

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I forgot (-1)

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but still not 1.00

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idk how to calculate it

rocky mango Oct 14, 2022, 1:47 PM

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ripe gazelle

the number u input is wrong

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nvm

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u input wrong number??

ripe gazelle Oct 14, 2022, 1:49 PM

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I didn't

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ripe gazelle Oct 14, 2022, 2:13 PM

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hi?

ripe gazelle Oct 14, 2022, 2:35 PM

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@rocky mango hi?

rocky mango Oct 14, 2022, 2:38 PM

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hi

ripe gazelle Oct 14, 2022, 2:38 PM

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so

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why it was wrong

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//Calculation (Standard Deviation)
        double standardDeviationResult = 0.00;
        double devPlusResult = 0.00;
        if (numN <= 1)
            System.out.println("Standard Deviation = NaN");
        else {
            for (int devCount = 0; devCount < numN; devCount++) {
                valueNum[devCount] = Math.pow(valueNum[devCount]-meanResult, 2);
            }
            for (int devPlusCount = 1; devPlusCount < numN; devPlusCount++) {
                devPlusResult = valueNum[devPlusCount] + valueNum[devPlusCount-1];
            }
            standardDeviationResult = Math.sqrt(devPlusResult/(numN-1));
            System.out.println("Standard Deviation = "+form.format(standardDeviationResult));
        }

rocky mango Oct 14, 2022, 2:39 PM

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ur calculation wrong

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try to debug

ripe gazelle Oct 14, 2022, 2:39 PM

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idk where is it wrong

rocky mango Oct 14, 2022, 2:40 PM

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what is the expected and what was actual output???

ripe gazelle Oct 14, 2022, 2:41 PM

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erm

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wrong value

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why

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🤔

rocky mango Oct 14, 2022, 2:42 PM

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      double sum = 0.0, standard_deviation = 0.0;
      int array_length = valueNum.length;
      for(double temp : valueNum) {
         sum += temp;
      }
      double mean = sum/array_length;
      for(double temp: valueNum) {
         standard_deviation += Math.pow(temp - mean, 2);
      }
      double result = Math.sqrt(standard_deviation/array_length);
      System.out.println("Standard Deviation = "+form.format(result));

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try this

ripe gazelle Oct 14, 2022, 2:44 PM

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nope

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still wrong

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not "1.64"

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rocky mango Oct 14, 2022, 2:45 PM

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rocky mango ``` double sum = 0.0, standard_deviation = 0.0; int array_length = v...

this is correct

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itsnot possible its not correct

rocky mango Oct 14, 2022, 2:45 PM

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ripe gazelle still wrong

is the sum and stoff right???

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show me ur corrent code

ripe gazelle Oct 14, 2022, 2:45 PM

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📎 message.txt

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it shows 1.27

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not 1.64

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Don't try to change the length of array as "5" since it must be "10" in total

rocky mango Oct 14, 2022, 2:48 PM

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ripe gazelle **Don't try to change the length of array as "5" since it must be "10" in total*...

when did i

#Array Syntax exception