Intro Java Class Help

[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...

[Aradon]

Originally Posted by 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...

Hello. So there are some basic things I can see without compiling it myself (Please list your errors next time so we can get through it as quickly as possible).

The first problem I see is this:

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

So what you've done is you've created this method called main, then ended the statement, and then created this block for it that does nothing. I think what you meant was to put your code INSIDE the block for main and not ending it with a semicolon.

Remember, that when we are creating methods for Java we want it in main. For example a simple hello world application:

public class HelloWorld
{

  public static void main(String args[])
  {
    System.out.println("Hello World!");
  }
}

As you can see, we want our program to say Hello World, and so we put it inside the main function in order for the compile and the JVM to know what to run first.

That's all I see right now, let us know if you have any other errors.