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20191028

C# 6.0 Null-Conditional Operator:

ObjectIsNull ?? 0;


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Sample1:
if(x != 0.0) s = Math.Sin(x)/x; else s = 1.0;
s = x != 0.0 ? Math.Sin(x)/x : 1.0;

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The conditional operator is right-associative, so an expression of the form
a ? b : c ? d : e

is evaluated as
a ? b : (c ? d : e)

not
(a ? b : c) ? d : e

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// cs_operator_conditional.cs
using System;
class MainClass
{
    static double sinc(double x) 
    {
        return x != 0.0 ? Math.Sin(x)/x : 1.0;
    }

    static void Main() 
    {
        Console.WriteLine(sinc(0.2));
        Console.WriteLine(sinc(0.1));
        Console.WriteLine(sinc(0.0));
    }
}

output:
0.993346653975306
0.998334166468282
1