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Java help

chocolate boy123

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

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stimpson

Your first mistake is using Java

chocolate boy123

Very funny, can you help?

Hollister11

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

Try turning it off and back on again.

razorblunt

get ProperCoffeeBeans();

[Deleted User]

stimpson wrote: »

Your first mistake is using Java

Second mistake was asking after hours about your homework.

Hollister11

Post your code and I'll help you.

chocolate boy123

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

Your second mistake was posting in AH

Hollister11

Use +text and not, quiz

OldGoat

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

chocolate boy123

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

Winterlong

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

Mr. CooL ICE

Moved from After Hours

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

Skylinehead

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

chocolate boy123

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

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

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

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

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

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

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