I have a question regarding Increment Operators

Question

PROGRAM 1:
int main()
{
int x,y;
x=10;
x=x++;
x=x++;
x=x++;
x=x++;
cout<<"Value of x= " <<x<<endl;
return 0;
}
//output: Value of x =10
PROGRAM 2:
int main()
{
int x,y;
x=10;
y=x++;
y=x++;
y=x++;
y=x++;
cout<<"Value of Y= " <<y<<endl;
return 0;
}
//output: Value of x =13
Why the Output of Program 1 is "10" not "13"??
Why the value of x is not increasing as in program 2?

Answer 1

Because first of all you are doing post increment so it first assigns the value and then it is incremented.
int x = 10;
x = x++; // RHS x is still 10 and it is again assigned to x which means the value never increments.
But in program 2 you are not assigning x to x again so it is incremented and value is updated to give you a new result.

Answer 2

Thank You Avinesh. I didn't see that way at all.