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Arrays - add selected elements

1 reply on 1 page. Most recent reply: Jun 20, 2005 12:27 AM by Matthias Neumair

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Wendi

Posts: 1
Nickname: wendi
Registered: Jun, 2005

Arrays - add selected elements

Posted: Jun 17, 2005 6:58 AM

I have a program where item names, prices are part of separate arrays. The user inputs the items they want and the quantity they want. I then need to add the elements (only the ones that the user has selected from input) and output them. My code (below) sums the prices of all the elements in the aray. how would I get it to just add the ones the user input (which would be different every time)

double sum=0;
for(double i=0;i<Price.length;i++)
{ sum = sum+Price[row]; }

Matthias Neumair

Posts: 660
Nickname: neumi
Registered: Sep, 2003

Re: Arrays - add selected elements

Posted: Jun 20, 2005 12:27 AM

1st of all: the names of varables including arrays should be small.
Only classes shoukd begin with a capital letter.

Now to your problem

I suppose you have the followig structure:

double price[n];
int quantity[n];

I don't have the minimum idea how your code can add all prices.
Id looks to me as if after this lines
sum = Price[row] * Price.length;
because you never alter row.

Try this:


double sum = 0;
for (int i = 0; i < price.length; i++) {
 if (quantity[i] > 0)
  sum = sum+price[i];
}

Note that this way it is only checked IF there is a quantity, but not what the quantity is.

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