asked on

Error incrementing integer value

I have an array of objects, where the object has a private variable defined in the header file as

int _no_of_points;

In the constructor i initialise it:

_no_of_points = 0;

But then in a later function where I say

_no_of_points++;

I get an error saying

Access violation reading location xxxxxxx

What on earth am I doing wrong? I can post more code if necessary, but I would prefer it if someone could just say "you're probably locking the memory somewhere else with code like xxxxxxxx, try looking for yyyyyyyyyy" :-)

Cheers,

FatBoyTim

ASKER CERTIFIED SOLUTION

rcarlan

membership

This solution is only available to members.

To access this solution, you must be a member of Experts Exchange.

Start Free Trial

Axter

Hi FatBoyTim,
>> int _no_of_points;
It should not be declared like that in the header file.
It should be declared extern in the header file, and in one of your *.cpp files it should be declared without the extern.

David Maisonave :-)
Cheers!

Axter

Disregard previous post.
I didn't realize that it was been declared inside a class.

Axter

Please post your code.

FYI:
You shouldn't start your variable names with an underscore.
Names that start with an underscore are reserved for the implementation IAW C++ standard.

FatBoyTim

ASKER

Bang on Radu, thank you - I was accessing array element -14. God, how stupid! It's so obvious when you know the answer :-)

Thanks for your help guys