In C Language,Arrays

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What is the maximum index size in bytes can be declared in arrays?

Posted 30-Oct-12 6:04am

Murali Mohan ks

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Paulo Zemek · Answer 1 · 2012-10-30T06:19:00

In fact the limit is defined if the compiler is 32 bits or 64 bits...
In theory a 32 bit computer allows for 4gb, but you will never be able to allocate that much as the operating system has its own limit, memory is already in use by other programs and the operating system itself and an array uses a single block of memory. So, even if your computer still has free memory, it may be simple unable to allocate a 1gb memory (for example) if the memory is fragmented.

On 64 bits computers, the value is something like 4 billion times 4gb... I don't know what's the name for that, but then how much memory do the computer have?

Thomas Daniels · Answer 2 · 2012-10-30T06:13:00

Solution 1

The maximum depends on the computer. On a computer with 32GB memory, you can create bigger arrays then on a computer with 4GB memory.

Posted 30-Oct-12 6:13am

Thomas Daniels

Updated 30-Oct-12 6:19am

v2

Comments

lewax00 30-Oct-12 12:17pm

I'm not sure that's entirely true. The compiler also as to store the value, and it probably makes some assumptions about how large that value can be (for example, it seems unlikely that a 32-bit compiler would allow for array sizes greater than 2^32-1).

Thomas Daniels 30-Oct-12 12:18pm

Ok, thanks! I'll update my answer.

Jochen Arndt · Answer 3 · 2012-10-30T06:29:00

Solution 3

It depends on the storage method.

When using arrays on the stack, the size is limited by the stack size of the application.

On the heap, the size is limited by the virtual memory.

For stack and heap, it is the actually available (free) memory when declaring or allocating.

Posted 30-Oct-12 6:29am

Jochen Arndt