c - segmentation fault for 2D arrays

Question

I want to define a 2D array of very big size. But it is giving me segmentation fault?

  #include <stdio.h>

  int main () {
       int i;
       int temp[4000][5000];
      for (i = 0; i < 5; i++)
      {
          printf ("Hello World
");
      }
  }

Can anyone please suggest me some other way? Is there some problem with memory initialization? Thanks in advance

Answer 1

You can allocate the whole table in only one array but you won't be able to access array data with indices using two square brackets:

int * temp = malloc(4000*5000*sizeof(int));

to access the element (i,j) where previously you wrote temp[i][j], now you should now compute the index the following way:

temp[i*5000+j];

and do not forget to free the memory allocated for your table afterward:

free(temp);