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Not enough. Usually enough.

The answer varies per execution environment (OS, compiler, library version, ...) and per system (installed RAM, CPU addressing bit width, etc).

On a modern PC running Windows or Linux, you can usually get several hundred kilobytes to over a meg on the stack, and over a gig of memory into the heap before you get fragmentation of virtual address space.

Just arbitrarily using stack is not good design though, and arbitrarily allocating memory also has its problems, because testing out-of-memory conditions is really hard.

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