C# 7 and .NET: Designing Modern Cross-platform Applications

Working with big integers

The largest whole number that can be stored in .NET Standard types that have a C# alias is about eighteen and a half quintillion, stored in an unsigned long.

In Program.cs, add a statement to import System.Numerics, as shown in the following code:

using System.Numerics;

In Main, add statements to output the largest value of ulong, and a number with 30 digits using BigInteger, as shown in the following code:

var largestLong = ulong.MaxValue;WriteLine($"{largestLong,40:N0}");var atomsInTheUniverse = BigInteger.Parse("123456789012345678901234567890");WriteLine($"{atomsInTheUniverse,40:N0}");

The ,40 in the format code means right-align forty characters, so both numbers are lined up to the right hand edge.

Run the console ...