Strange memory allocation

boon kian

Hi, I am a newbie in visual c and my "hello world" program in vc is in 2002 !! I desperately needed some help from big bro in vc regarding memory allocation. I have created a algorithm using extensive recusive functions. I needed 3 dynamic array inside my functions and so i happily used the "new" operator to help me. ( the array size is ard 100 integers) To my dismay :omg: , the array address was allocated so close together that changing some elements in one array will affect my the other array !! I am at a loss of wat to do to avoid this (and in the first place why this happen !!) Can any kind soul explain to me why such thing happen and what alternative do i have ?? Thank you. A desperate newbie X|

Chris Losinger

can you show us the memory allocation code you're using?

A man is like a rusty wheel on a rusty cart, He sings his song as he rattles along and then he falls apart. -- Richard Thompson

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Anonymous

The allocation of memory side by side, is a natural phenomenon. This is something the compiler and the run time system would handle. I dunno if you can change it. I dont think it is possible . And how does the allocation of the memory affect your code. IMO you should try and change it in a way that it is not affected by memory allocation structure. HTH

Todd Smith

It sounds like your using a pointer incorrectly. If you paste some code I'm sure we can pin-point the problem. Otherwise it's to hard to diagnose. Todd Smith

markkuk

Did you remember that if you allocate an array with 100 elements, the indexes will be 0 - 99 ?

boon kian

Hi all, really thanx a lot for you help !! my code goes like this: int *header, *data ; bool *checkarray; int *connectcomponent; width = height = 9; connectcomponent = new int [width*height/9]; checkarray = new bool [width*height]; data = abc.getBitmapData (); // getBitmapData returns a pointer to a int array which is the same size as checkarray; I dun see anything wrong but when i run the program... so of the values in data was changed even though i did not issue any command to do so. when I check the address of checkarray and data, i found out that there is only a diff by 0x30 !! bk

boon kian

yes i do .. anyway to add to my previous note .. I did not change the values of array that *data point to but i constantly change the value of the array that *checkarray point to .. however when i print out the values of array that *data point to .. those values at the begining of the array are changed !! Thanx a lot for your help bk