Segmentation fault upon assigning value to 3rd matrix

[spskhokhar]

// code

 
  1 #include <iostream>
  2 
  3 int main()
  4 {
  5     const int m = 1000;
  6     int a [m] [m];
  7     for (int i=0; i < m; i++)
  8         for (int j=0; j < m; j++)
  9             a [i] [j] = 0;
 10 
 11     int b [m] [m];
 12     for (int i=0; i < m; i++)
 13         for (int j=0; j < m; j++)
 14             b [i] [j] = 0;
 15 
 16     int c [m] [m];
 17     for (int i=0; i < m; i++)
 18         for (int j=0; j < m; j++)
 19             c [i] [j] = 0;
 20 
 21     return 0;
 22 }

the above code gives
Segmentation fault (core dumped)

the program exits normally if
1) comment line 19 or replace it with ';' OR
2) line 5 'const int m = 100;'

if memory gets allocated on line 16, why seg fault upon accessing/writing the location.

[kbw]

How large is a, b and c?

Where are you allocating that memory? Do you think there's enough space there?

[spskhokhar]

around 3.8 MB each. And system has enough memory

sorry for typo, not line 16 but replacing line 19 with ';' (null statement), it exit normally ie if not accessing memory location of third matrix 'c';

it is allocating memory at line 16;

but upon accessing it on line 19, gives seg fault;

[z05DSL3A]

spskhokhar wrote:

around 3.8 MB each. And system has enough memory

...but does main have enough stack space for that?

[spskhokhar]

You are right Grey Wolf, the stack limit is 8192 KB.
Thanks