Question

Have you ever tried this before?

static void Main(string[] args) {     int x = 10;     x = x++;     Console.WriteLine(x); } 

Output: 10.

but for

static void Main(string[] args) {     int x = 10;     x++;     Console.WriteLine(x); } 

Output: 11.

Could anyone explain why this?

Answer 1

X++ will increment the value, but then return its old value.

So in this case:

static void Main(string[] args) {     int x = 10;     x = x++;     Console.WriteLine(x); } 

You have X at 11 just for a moment, then it gets back to 10 because 10 is the return value of (x++).

You could instead do this for the same result:

static int plusplus(ref int x) {   int xOld = x;   x++;   return xOld; }  static void Main(string[] args) {     int x = 10;     x = plusplus(x);     Console.WriteLine(x); } 

It is also worth mentioning that you would have your expected result of 11 if you would have done:

static void Main(string[] args) {     int x = 10;     x = ++x;     Console.WriteLine(x); }