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Readinf file and parsing

Posted on 2003-11-29
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Last Modified: 2010-04-02
Hi!
I am trying to read the file below and store into array.
Each number is between 1 – 80 and number of line will be between 1 – 10,000.
Also, is it good idea to use array since this file might contains 10,000 of line?

Ex)
3:  1,  4,  5, 10, 14, 15, 16, 19, 22, 25, 26, 37, 38, 42, 50, 56, 62, 70, 74, 80
1:  6, 12, 27, 28, 29, 30, 33, 36, 37, 39, 41, 43, 46, 49, 56, 57, 59, 62, 73, 80
….
….
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Question by:dkim18
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gkatz earned 400 total points
ID: 9843680
depending on the file size it may not be a good idea to use a regular array.  Arrays are allocated in the stack and the stack has a limitted size.  Instead it may be a good idea to create the array at run time.  This has the added advantage that you can specify the size as a variable instead of a constant (once you create it, the size is still constant) and it is created on the heap instead of on the stack which means that you have a lot larger storage size.  To do so use the new operator.

double* myArray = new double[arraySize];

afte that you can use the array just like any standard array.  Just don't forget to deallocate it when you are done.

delete [] myArray;

-gkatz
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