Thread: I thought that this would be right?

Here is the prompt I got: Suppose you have one cent ($0.01) in a sock. Each day you double the amount of money you have in the sock. Thus on day one you have one cent, on day two you have two cents ($0.02), on day three you have four cents ($0.04), and so forth.

The doubleEachDay method takes a double value, jackpot, as its input argument, and calculates the number of days needed to reach or exceed the jackpot amount, starting at 0.01 and doubling each day. The method returns the number of days required for doubling; this value should be stored in the integer variable numDays.

Finish the doubleEachDay method below.

public int doubleEachDay(double jackpot) {
  double amount = 0.01;
  int numDays = 0;
 
Finish the method here
 
return numDays;
}

So what I thought would work was

while(double amount < jackpot){
  amount=(amount*2);
  numDays++;

but that gave me a weird error message
"compilation error (line 1, column 14):
'.class' expected"

So i feel like my code should have worked but obviously it didn't

We cant know what your error is without knowing whats on the line you get an error on is. Your code seems fine, but the error is somewhere else, prolly inside the main function where you run your stuff etc.

Link the whole code.

If thats all the code you have in your class, you havent declared the class. EVERY .java file you create is a CLASS. The compiled files' extension is even .CLASS. The absolute first thing you do when you make a new java program is to name the file, then write this piece of code:

public class [B][I]FileName[/I][/B] {
 
//Code here, remember a main method if you want it to be runnable.
 
}

It is a homework assignment, the only place that I can actually type any code in is after
in numDays = 0;
code goes here
return numDays;
}
it is just completing the method but Im not sure what to put there because I thought what I was putting wouldve worked

public int doubleEachDay(double jackpot) {
  double amount = 0.01;
  int numDays = 0;
 
  while(amount [B][I]>[/I][/B] jackpot){ [B][I]<-- amount < jackpot, "is less than"[/I][/B]
    amount=(amount*2);
    numDays++;
    }
 
return numDays;
}

This method is now complete, if it doenst work; theres something else wrong with the class. The method declares everything it needs and it returns an int as promised. (Note the error you did in the while-loop)

Originally Posted by Charlie

public int doubleEachDay(double jackpot) {
  double amount = 0.01;
  int numDays = 0;
 
  while(amount [B][I]>[/I][/B] jackpot){ [B][I]<-- amount < jackpot, "is less than"[/I][/B]
    amount=(amount*2);
    numDays++;
    }
 
return numDays;
}

This method is now complete, if it doenst work; theres something else wrong with the class. The method declares everything it needs and it returns an int as promised. (Note the error you did in the while-loop)

Yeah that didnt work. This is the feedback I got
The input value for jackpot was 910.7072635769393

Your code produced:
0

The correct solution produced:
17

Did you actually swap the > for a <?