Run time error on large array sizes in C/C++

2018-06-28 13:40:42

This question already has an answer here:

Segmentation fault on large array sizes 5 answers

In C++, when you're doing this:

unsigned long long a[100000];

It allocates the memory from the stack. Stack memory is limited so you can't do too big allocations.

When you do this:

unsigned long long* a = new unsigned long long[1000000];

It allocates the memory from the heap. Heap allocations can be big.

More information about stack and heap memory is in this Stack Overflow post.

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