What does x++ mean?

Question

Do I add the initialized x before or after adding itself again?

Answer 1

Post-increment operator is used to increment the value of variable as soon as after executing expression completely in which post increment is used. In the Post-Increment value is first used in a expression and then incremented.
b = x++;
In this example suppose the value of variable ‘x’ is 5 then value of variable ‘b’ will be 5 because old value of ‘x’ is used.

Answer 2

int x =4;
console.writeline(x++); -> output 4 and x is now 5
console.....(++x); -> output 5 and x is now 5 obvi

Answer 3

In an easy word:
x++=x+1