C: plz reply asap

[vickywiz]

#include<stdio.h>
int main(){
    int i=5,j=5,y;
     x=++i + ++i + ++i;
    y=++j + ++j + ++j;
    printf("%d  %d  %d %d",x,y,i,j);
    return 0;
}

answer: In gcc 22 22 8 8
In turbo c 21 24 8 8

Why does gcc and turbo c give different answers.?
How is parameter passed to a function in gcc.(it is passed from right to left in turbo c)?

[leppyr64]

turbo C is not standards compliant.

The order for those operations is not defined since you are working with addition.

1+(2+3) == (1+2)+3

Therefore the ++i functions will likely be performed in parallel. This causes the side effect that you are seeing.

[leppyr64]

On top of that there's no definition for when functions get evaluated either.

array[++i] =++i; is equally dangerous.

[vickywiz]

thanx....

[leppyr64]

I have been thinking about this more... I'm curious if it doesn't work like this:

i = 5
x = ++i + ++i + ++i;
x = i + ++i + ++i; // i == 6 now
x = i + i + ++i; // i == 7 now
x = 14 + ++i;
x = 14 + i; // i == 8 now
x = 14 + 8;
x = 22

[vickywiz]

i also tried many combinations....but since such conditions are UNDEFINED..(source:http://c-faq.com/ansi/undef.html)...there is no use of understanding their working because compiler itself does not know behavior of such UNDEFINED expressions...
The URL i provided above gives standard definition of terms given. But i am unable to understand the documentation thing(refer URL->"the choice need not be documented" ) in implementation-defined and unspecified behavior.