": ?" operator in c#

Operator -- c#

//Decrement operator (--)
int i = 3;
Console.WriteLine(i);   // output: 3
Console.WriteLine(i--); // output: 3
Console.WriteLine(i);   // output: 2

double a = 1.5;
Console.WriteLine(a);   // output: 1.5
Console.WriteLine(--a); // output: 0.5
Console.WriteLine(a);   // output: 0.5
//Increment operator (++)
int i = 3;
Console.WriteLine(i);   // output: 3
Console.WriteLine(i++); // output: 3
Console.WriteLine(i);   // output: 4

double a = 1.5;
Console.WriteLine(a);   // output: 1.5
Console.WriteLine(++a); // output: 2.5
Console.WriteLine(a);   // output: 2.5

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