heap - C: how to manage a large structure? -

in c:

i trying use structure containing large array, , have stack overflow error while declaring it. guess (correctly?) don't have enough memory in stack, , therefore, should use heap (i don't want change stack memory size, code used others). show me way simply? or should use else structure?

my code - definitions.h:

#define a_large_number 100000  struct std_calibrations{     double e[a_large_number]; }; 

my code - main.c:

int main(int argc, char *argv[]) {     /* ...     */      // stack overflows here:     struct std_calibrations calibration;      /* ...     */      return (0); }  

thank help!

a couple of options:

1. use malloc(3) , free(3) dynamically allocate structure @ runtime. option you're talking when "should use heap."

   struct std_calibrations *calibration = malloc(sizeof *calibration); 

   and later,

   free(calibration); 

2. give structure static storage duration. either add static keyword or make global. option may change semantics how use structure, given example code, should fine.