Java help

chocolate boy123 · 13-10-2016 12:54PM #1

Hi I am learning about System.out.printf in Java and am a bit confused and I'm wondering can someone help clear my confusion. I'll post my code below and show where I get confused, thanks

stimpson · 13-10-2016 12:55PM

Your first mistake is using Java

chocolate boy123 · 13-10-2016 12:56PM

Very funny, can you help?

Hollister11 · 13-10-2016 12:56PM

stimpson wrote: »

Your first mistake is using Java

The most used language in industry. Yea total mistake. If you know java, employment is easy.

whiskeyman · 13-10-2016 12:56PM

Try turning it off and back on again.

razorblunt · 13-10-2016 12:57PM

get ProperCoffeeBeans();

RobbieTheRobber · 13-10-2016 12:57PM

stimpson wrote: »

Your first mistake is using Java

Second mistake was asking after hours about your homework.

Hollister11 · 13-10-2016 12:58PM

Post your code and I'll help you.

chocolate boy123 · 13-10-2016 12:58PM

double score [] = new double [10];
int count = 0;
String text= "";

while (score [count] !=-1){
score [count]= Double.parseDouble(JOptionPane.showInputDialog("Enter the numbers or press -1 to terminate"));
text += score [count];
}
count++;
System.out.printf("Numbers: %.2s",text);

}
}

That is my code. I am trying to print Numbers: and the numbers from the array but because its a string i cant format to two decimal places so how can i do this as doubles. I know %.2f but the problem is in my loop it is a String because i dont know how to do it a different way.

MOH · 13-10-2016 12:58PM

Your second mistake was posting in AH

Hollister11 · 13-10-2016 01:00PM

Use +text and not, quiz

OldGoat · 13-10-2016 01:02PM

C:\DOS
C:\DOS RUN
? "Run DOS run"

chocolate boy123 · 13-10-2016 01:03PM

I dont understand by that. If you mean System.out.println ("Numbers" + text); I cannot i must use System.out.printf ToO Format

Winterlong · 13-10-2016 01:08PM

Might be easier just to write the numbers down rather than printing them?

Mr. CooL ICE · 13-10-2016 01:09PM

Moved from After Hours

You are more likely to receive better responses here. Please remember to read the charter before replying.

Skylinehead · 13-10-2016 01:10PM

Are you trying to print out the sum of the numbers, or the concatenated sequence?

chocolate boy123 · 13-10-2016 01:18PM

I am trying to print out the sequence of the numbers, i have it working now but it also prints out -1 as the last number as i try to leave the loop

chocolate boy123 · 13-10-2016 01:54PM

Can someone please help me understand why -1 will be printed aswell when trying to exit the loop?

public static void main(String[] args) {
double score [] = new double [10];
double total=0;
double average =0;

int count = 0;
int avgGreater =0;
int avgSmaller=0;

String text= "";

while (score [count] !=-1){
score [count]= Double.parseDouble(JOptionPane.showInputDialog("Enter the numbers or press -1 to terminate"));
text += score [count] + "\t";
}
count++;

for (int x=0; x<score.length;x++){

average = (total += score[x]) / score.length;

if (score[x] >= average){
avgGreater++;
}
else if (score [x] < average){
avgSmaller++;
}
}
System.out.println("Scores entered were: " + text);
System.out.printf("\nAverage is %.2f", average);
System.out.println("\nNumbers greater or equal to average are " + avgGreater);
System.out.println("\nNumbers smaller than average are " + avgSmaller);
}
}

Skylinehead · 13-10-2016 02:09PM

It's printing -1 because you inputted it into the array, it only breaks the loop after that.

You could use a different variable to contain the input, and check if its -1 before including it in the array.

Something like

for (int x=0; x<score.length;x++){
    double y = Double.parseDouble(JOptionPane.showInputDialog("Enter the numbers or press -1 to terminate"));

   if(y != -1) {
      score[x] = y;
   } else {
      break;
   }
}

Not sure if thats exactly correct. Are you inputting a max of 10 numbers?

chocolate boy123 · 13-10-2016 02:11PM

The max the array can hold is 10 values. We were told that we must use a sentinel controlled loop to do this so i cant use your way unfortunately

Skylinehead · 13-10-2016 04:44PM

chocolate boy123 wrote: »

The max the array can hold is 10 values. We were told that we must use a sentinel controlled loop to do this so i cant use your way unfortunately

Ah I see. You could strip out any values equal to -1 maybe, once you finish the loop?

stimpson · 13-10-2016 04:56PM

while (score [count] !=-1){
score [count]= Double.parseDouble(JOptionPane.showInputDialog("Enter the numbers or press -1 to terminate"));
text += score [count] + "\t";
}
count++;

becomes

while (score [count] !=-1){
score [count]= Double.parseDouble(JOptionPane.showInputDialog("Enter the numbers or press -1 to terminate"));
if (score[count] != -1){
text += score [count] + "\t";
}
}
count++;

It's still sentinal controlled loop, you just don't add it to your array.

veryangryman · 14-10-2016 02:05PM

Get sorted? Can you send on the wording of the assignment just to clarify a few points

Java help

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