Please help me on this BASIC Java programming question...

[codyland]

My professor gave us the following assignment:

Write a Java program to compute the number of days for the following scheme. The recipient receives a penny on day 1 and the amount is doubled on subsequent days. That is on day 2 the amount received is 2, on day three 4 pennies, day four 8 pennies and so on. The recipient accumulates the amount received. Write a program to compute how many days will it take for the recipient to accumulate more than 100 dollars.

Here is the code i came up with but continue to receive errors when compiling...what is wrong? :-(

import java.util.*;

public class assignment4 {

public assignment4() {
}
public static void main(String[] args);{
}

int dailyAmount, numberOfDays;
double totalAmount;

Scanner keyboard = new Scanner(System.in);

totalAmount = 0;
dailyAmount = 1;
numberOfDays = 1;

while (totalAmount <= 100)
{
totalAmount = dailyAmount*2;
numberOfDays++;
dailyAmount = dailyAmount*2;
}
if (totalAmount >= 100)
System.out.println("The total number of days it took for the balance to equal $100 was" + (numberOfDays));


}

Thank you in advance for any help you can give...

[r035198x]

Do the Maths first. You have a geometric progression with a = 1 and r = 2.
The sum of the first n terms is given by
a(1- r(^n)) / (1 - r).
You have been given the required sum as 100, so rearrange the above
for n.
You can then write a function based on your equation for n.
Realize that while n in your function may be non-integral, you'd need to round it up to give the correct response to the question.

P.S When posting compilation problems, include the error message reported by the compiler.

[JosAH]

public class assignment4 {
 
    public assignment4() {
    }
    public static void main(String[] args);{
    }
 
        int dailyAmount, numberOfDays;
        double totalAmount;
 
// and more statements follow ...
}
 

The structure of that class doesn't make any sense: statements should be put
in the body of methods and constructors, not somewhere else in a class.

Like this:

public class X {
   public X() { // your constructor
      // statements for your ctor go here ...
   }
   public static void main(String args) { // the main entry point of your program
      // statements go here ..
  }
}

kind regards,

Jos