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Why get general protection fault.
- Thread starter IHateTron
- Start date
Zyrenthian
Programmer
Possibly writing into memory that you dont have
i.e.
char buffer[12];
buffer[12] = 'A';
Matt
i.e.
char buffer[12];
buffer[12] = 'A';
Matt
- Thread starter
- #3
Ok, this I didn't know:
I have this in my code:
#define MAXSTU 100
I then have this array:
char names_and_courses[MAXSTU][2][30];
So I was having the problem outlined above, couldn't find anywhere where I was trying to access elements past the end of my array anywhere like Matt suggested. Then I change MAXSTU to 50 and hey presto, problem solved. But why is this, perhaps somebody coukd let me know, thx.
I have this in my code:
#define MAXSTU 100
I then have this array:
char names_and_courses[MAXSTU][2][30];
So I was having the problem outlined above, couldn't find anywhere where I was trying to access elements past the end of my array anywhere like Matt suggested. Then I change MAXSTU to 50 and hey presto, problem solved. But why is this, perhaps somebody coukd let me know, thx.
- Thread starter
- #5
Because when declaring an array like
array[50], its indexes are in the range
0..49.
array[50] = something could cause a GPF. [red]Nosferatu[/red]
We are what we eat...
There's no such thing as free meal...
once stated: methane@personal.ro
array[50], its indexes are in the range
0..49.
array[50] = something could cause a GPF. [red]Nosferatu[/red]
We are what we eat...
There's no such thing as free meal...
once stated: methane@personal.ro
- Thread starter
- #7
But I still dont see a problem. My array was initialised correctly.
So;
array[50] (indexes are 0..49)
and;
array[100] (indexes should be 0..99)
(No problem here, I understand this.)
And my loop should work with both array's regardless of their size. So why did I get a problem? I never have tried to write/use memory I didn't have. If that was the problem then surely the fact that it was changed from MAXSTU = 100 to MAXSTU = 50 but not changing the loop should make no difference and I would still be getting a general protection exception. But simply changing the value of MAXSTU from 100 to 50 solved it. Why?????????
Thx 4 your help BTW. Appreciated.
So;
array[50] (indexes are 0..49)
and;
array[100] (indexes should be 0..99)
(No problem here, I understand this.)
And my loop should work with both array's regardless of their size. So why did I get a problem? I never have tried to write/use memory I didn't have. If that was the problem then surely the fact that it was changed from MAXSTU = 100 to MAXSTU = 50 but not changing the loop should make no difference and I would still be getting a general protection exception. But simply changing the value of MAXSTU from 100 to 50 solved it. Why?????????
Thx 4 your help BTW. Appreciated.
Clearly, your program is doing something illegal, but we can only speculate on what it's doing in the absence of the source code.
Try posting a *small* compilable program that exhibits the problem.
Russ
bobbitts@hotmail.com
Try posting a *small* compilable program that exhibits the problem.
Russ
bobbitts@hotmail.com
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