# Thread: Help with arrays and matrices!

1. Member
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Feb 2013
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## Help with arrays and matrices!

I am currently stuck with this problem...

Write a program for the next problem. A store sells the following products: Milk, soap, meat, beans and tomatoes. The cost of each product is \$12.5, \$18.2, \$69.9, \$30.5 y \$15.9 respectively. The price for the costumers is 30% more than the cost of the product.

Randomly create numbers from 0 to 10 which will represent the quantity sold of each product each day for a whole month.
The owner wants to know the total sales for each product in a day and the whole month, the total sales of each day and which product gives the most profit for the month.

So far I have created an array that holds the string names, the cost of each product and the price for each costumer. I got stuck on the matrix part where I need to place a vector inside each element... After that I need to start doing the operations inside the matrix such as, accumulators and counters... I started this without guidance, so I don't know if I have the right approach. So far this is what I have.

Java Code:
```public static void main(String[] args) {
int x=0, y=0, z=0, number=0;
Double precio[];
String[] productos = {"leche", "jabon", "carne", "frijol", "tomate"};
Double[] costo = {12.5, 12.2, 69.9, 30.5, 15.9};
precio = new Double[5];
Random num = new Random();
int mmes[][] = new int [5][6];

for(x=0; x<=4; x++){
precio[x] = costo[x]+(costo[x]*.30);

System.out.println(precio[x]);
}

for(x=0; x<=5; x++){
for(y=0; y<=6; y++){

mmes[x][y] = precio[z];
for(int counter=1; counter>=10; counter++){
number = num.nextInt(11);
System.out.println(number + " ");
}
}
}

}

}```

2. Senior Member
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## Re: Help with arrays and matrices!

Hi chwex,

I'm assuming you want something basic for this problem.
You could use a two dimensional array which holds the number of each product sold where each row represents a different item whilst each colums represent a day.
In effect you would use a 5 by 30/31 array to hold the values. The months can get a bit messy though as the actual number of columns required is dependant on the number of days in the month.

Regards.

3. Member
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## Re: Help with arrays and matrices!

Thanks for the response Ronin! I appreciate it! I will try your approach since it seems a bit easier than the one I had in mind!

4. Senior Member
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## Re: Help with arrays and matrices!

You're welcome.

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