What is x after “x = x++”?

Question

What happens (behind the curtains) when this is executed?

int x = 7;
x = x++;

That is, when a variable is post incremented and assigned to

Answer 1

What happens when int x = 7; x = x++;?

ans -> x++ means first use value of x for expression and then increase it by 1.
This is what happens in your case. The value of x on RHS is copied to variable x on LHS and then value of x is increased by 1.

Similarly ++x means -> increase the value of x first by one and then use in expression .
So in your case if you do x = ++x ; // where x = 7
you will get value of 8.

For more clarity try to find out how many printf statement will execute the following code

while(i++ <5)   
  printf("%d" , ++i);   // This might clear your concept upto  great extend