Compiler Error CS1021
Integral constant is too large
A value represented by an integer literal is greater than UInt64.MaxValue.
The following sample generates CS1021:
// CS1021.cs
class Program
{
static void Main(string[] args)
{
int a = 18_446_744_073_709_552_000;
}
}
The following code also generates CS1021:
using System.Numerics;
class Program
{
static void Main(string[] args)
{
var a = new BigInteger(18_446_744_073_709_552_000);
}
}
For information about how to instantiate a System.Numerics.BigInteger instance whose value exceeds the range of the built-in numeric types, see the Instantiating a BigInteger Object section of the BigInteger reference page.
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