[C#] ?? Null 병합 연산자

190730 - 1 - 연산자

 

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Null 병합 연산자

static void Main(string[] args)

{

    //Console.WriteLine("HELLO C#");

    //int a = 12;

    //object b = (object)a; // boxing

    //int c = (int)b; //unboxing

 

 

    int? a = null;

    Console.WriteLine($"{a ?? 0}");

 

    a = 99;

    Console.WriteLine($"{a ?? 0}");

}

0

99

 

static void Main(string[] args)

{

    int? num = null;

    Console.WriteLine($"{num ?? 0}");

 

    num = 99;

    Console.WriteLine($"{num ?? 0 }");

 

    string str = null;

    Console.WriteLine($"{str ?? "Default"}");

 

    str = "Specific";

    Console.WriteLine($"{str ?? "Default"}");

}

0

99

Default

Specific