c# System.OverflowException

Question

So this is my code:

static void Main(string[] args)
{
    Console.WriteLine("How many numbers are you going to enter?");

    long num = long.Parse(Console.ReadLine());

    long[] nums = new long[num];
}

When I enter 10000000000 for "num" I get

"System.OverflowException Arithmetic operation resulted in an overflow."

What do i do to fix it?

This is some 80 GB of memory. Only 64-bit processes can handle this. — Yacoub Massad
– Yacoub Massad, Commented Dec 31, 2015 at 15:33
The number you are trying to use goes above Int32.MaxValue and you cannot create an array that big. — Camilo Terevinto
– Camilo Terevinto, Commented Dec 31, 2015 at 15:33

Yuval Itzchakov · Accepted Answer · 2015-12-31 15:38:32Z

9

Your code overflows because the maximum size for an array in C# is Int32.MaxValue, which equals to 2147483647. You can see hints to that in the source code, and it is clearly stated in the documentation:

By default, the maximum size of an Array is 2 gigabytes (GB). In a 64-bit environment, you can avoid the size restriction by setting the enabled attribute of the configuration element (<gcAllowVeryLargeObjects> introduced in .NET 4.5) to true in the run-time environment. However, the array will still be limited to a total of 4 billion elements, and to a maximum index of 0X7FEFFFFF (2146435071) in any given dimension (0X7FFFFFC7 (2147483591) for byte arrays and arrays of single-byte structures).

edited Dec 31, 2015 at 15:38

answered Dec 31, 2015 at 15:33

Yuval Itzchakov

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Comments

Patrick Hofman · Accepted Answer · 2015-12-31 15:34:27Z

4

Okay, you are trying to allocate a lot of memory, since calling the long array constructor, actually already frees the memory you requested. A long is 64 bits, so 8 bytes. 8 bytes * 10000000000 = 80 GB of memory. That's too much.

The maximum length of an array in C# is int.MaxValue, which is 2,147,483,647 (16GB using a long), assuming you have enough memory.

answered Dec 31, 2015 at 15:34

Patrick Hofman

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