Segmentation fault on large array declaration [duplicate]

Answer 1

The auto memory (used in local arrays) has a limit well below the allocatable memory.

You can do practically the same with this (it uses pointers)

#include 

int main(int argc, const char *argv[])
{
    unsigned long long lim = 2000000;
    unsigned long long *nums2lim=malloc(lim*sizeof(unsigned long long));

    free(nums2lim); // don't forget this!

    return EXIT_SUCCESS;
}