Dear all i used the following code to store data in array of structures (struct items item[]) but when the array size becomes > 5990 the program terminates unexpectedly. can you please explain why?

Code:
#include <stdio.h>
#include <string.h>
#include <stdlib.h>

struct items
{
 char name[100];             
 char call_no[10];
 char author[100];
 char type[10];
 char borrower[100];
 int availability;
 char due_date[8];
 char genre[15];
 
};



int main()
{
 struct items item[5500]; // program stops unexpectedly
 char name[100];             
 char call_no[10];
 char author[100];
 char type[10];
 char borrower[100];
 int availability;
 char due_date[8];
 char genre[15];

  printf("Enter the name of the item with _ for spaces\n");
  fflush(stdin);
  fgets(name,100,stdin);
  printf("\n%s",name);

system("pause > null");
return 0;
}