Debug assertion error ?

When i try to execute my .exe it doesnt work after i compile it
all the information can be seen at :
http://www.pixelsonmy.tv/help/

there is the error i get (a pic of the screen shot)

any ideas on what is wrong?

im runnin VSC++ 6.0 on windows XP

Some possibilities:

1) m = new double [rows*columns];

You don't check to see whether m is null or not. Maybe your new request didn't return a valid address?

2)void matrix::set_val(int r, int c, double d){
m[rows * columns + columns] = d;
}

Your array index goes out of bounds in your loop, and even though that's not illegal, so your program will compile, maybe that's causing a memory problem when you run your program.

Couple of things I saw right away were --

In main.cpp

You're setting M1 to a 3x3 matrix. However, in the for loop right afterwards, you're overrunning a buffer. Your for loop variable goes from 0..8 and you're attempting to access stuff like M1(8,8) when your matrix's max is M1(2,2).

Also in matrix.cpp, you have:

I think you really meant this to be:


BTW your code for operator /= is incorrect as well. There's a logic error in that function, that I trust you'll have no problems finding. Hope this helps!

thank you, i fixed the problem with number 2, im not longer getting that debug anymore, now it just crashes :-\

>> im not longer getting that debug anymore, now it just crashes :-\
Probably cuz your for loop in main.cpp goes from 0..8. Try changing it to:
for (int i=0; i < 3; i++)

Also note the other errors I found in your code, in my prev. post on this thread

maskzilla,

Can you tell me how you did that screen capture? At work, I used to be able to do screen captures of some information in an app, and then save it to look at the next day, but I can't seem to figure out how to do that on my pc at home.

Ctrl + Alt +Print Screen, then i just Choose New in Adobe Photoshop, and pasted, i think you can paste in Word too tho

hmm okay, i fixed what i think was the problem, now it runs.. just doesnt do anything :-\ i re-uploaded the fixed pages

"Ctrl + Alt +Print Screen"

Nothing happens. I tried it on the devshed forum screen. Do I have to have my cursor somewhere special?

Ahhhah! Print Scrn(I didn't have to press Ctrl + Alt + Print Scrn just Print Scrn) may appear to do nothing but it sends the contents of the active window to your clipboard which I was then able to paste into Word. Thanks.

anyone? :-[

Dude, you still didn't fix the bugs in your operator /= function yet -- check it carefully and you'll see what the problem is. Also you need to reset your matrix M1 after you declare it (and before calling set_val), so that you know you have 0 for the rest of the elements.

How do I know that this will work. Because I FIXED them last night on my end and got your code to work perfectly.

7stud -- I believe the command is Alt-PrtScrn. PrtScrn by itself captures the entire desktop to the clipboard. Alt-PrtScrn captures only the active window to the clipboard.

duuuuuuuuuuh thank you.. im an idiot

You only tell your program to output "finished" to the screen:

void main(){

matrix M1(3,3);
matrix M2(3,3);

for (int i = 0; i < 2; i++)
M1.set_val(i, i, 2);

M1 /= .03;
cout << "finished" << endl;

}