Post and Pre Increment in C

Possible Duplicate: Could anyone explain these undefined behaviors (i = i++ + ++i , i = i++, etc…) There is a code following below and i ma facing a very serious problem in understanding the logic for the code. ``` #include <stdio.h> #include <stdlib.h> int main(void ) { int i = 1 ; printf("\n%d %d %d %d\n",++i,i++,i++,++i) ; return 0 ; } ``` I am using gcc compiler under the linux distro named Mandriva. In the above mentioned i have used pre and post increment with a variable in the printf statement. The output that i am supposed to get is 2 2 3 5, but i am getting a different output. Please help me in this code. I am feeling much difficult in this code.