I'm new to Java and have just learnt a little on Arrays. However I'm not very sure how I should apply them.

I have a main method which has a switch case. If the user chooses 1, it will prompt the user to enter the daily expenses for a week. If the user chooses 2, it will show the total amount of expenses for the week. I've decided to use arrays to store the the amount for everyday.

here's my code.

``````double[] monArray= new double[10];
double[] tuesArray= new double[10];
double[] wedArray= new double[10];
double[] thursArray= new double[10];
double[] friArray= new double[10];
double[] satArray= new double[10];
double[] sunArray= new double[10];

for(______________________________)
{
System.out.print("Enter Mon Charges : \$");

System.out.print("Enter Tues Charges : \$");

System.out.print("Enter Wed Charges : \$");

System.out.print("Enter Thurs Charges : \$");

System.out.print("Enter Fri Charges : \$");

System.out.print("Enter Sat Charges : \$");

System.out.print("Enter Sun Charges : \$");
``````

After the user entered all the amount for week one, he will return to the choice menu. Then, when the user chooses 1 again and entered the new value for the faily expenses, it will be started as week 2, which will be displayed in choice 2 where it shoows the total amount for all the weeks.

So, what should I place inside the for loop so that the amount for the daily expenses will be stored in the arrays and not be over-written when the user chooses 1 and enter the daily expenses again?

And how do I calculated the total expenses for the week?

It really seems like you should use a 2D array for this. You don't want a separate array for each day. The way you have it will make it hard to sum the entire thing. I would do something like:

double days[][] = new double[7][10];

Then if you want to total its just:

for(int day=0;day<7;day++)
{
for(int exp=0;exp<10;exp++)
{
total = total + expenses[day][exp];
}
}

Then when you add the want to add to each day, you need to loop over the expenses for that day and find the first non-zero element, thats where you add the expense. Of course if you hit 10 for a day, you can't fit anymore expenses in.

Jeff

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