Unpredicted language behavior i++

Question

I tried to do the following

i=0;
if (i++ % Max_Col_items == 0 && i !=0)
{

}

and discovered that it increased i in the middle

i % Max_Col_items == 0;
i=i+1;
i !=0;

when I though it would add increase i in the end:

i % Max_Col_items == 0;
i !=0;
i=i+1;

Can any one find explanation of how i++ works in C#?

Answer 1

i++ will give you the original value, not the incremented, You will see the change on the next usage of i. If you want to get the incremented value then use ++i.

See the detailed answer by Eric Lippert on the same issue

Answer 2

i++ immediately increments the value of i but evaluates as the value before incrementation.

It doesn't leave the value of i untouched until the end of the line of code, which appears to be what you expect.

Answer 3

That is because (as you have rightly noted)

i % Max_Col_items == 0;

is an operation in itself. Once that line of operation is over (with value of i ) the increment is done.