Operator associavity problem with pre and post increment :( [duplicate]

This question already has answers here: Closed 11 years ago.

P开发者_如何学Goossible Duplicate:

Could anyone explain these undefined behaviors (i = i++ + ++i , i = i++, etc…)

#include< stdio.h >

int main()
{
    int i = 1;
    int x = ++i * ++i * ++i;
    printf("%d\n", x);
    printf("%d\n\n",i);

    return 0;
}

Im getting output of 1!! and 4 in gcc. I use ubuntu linux

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The behaviour of your code is undefined since i is modified more than once between sequence points:

int x = ++i * ++i * ++i;

See the FAQ (I urge you to read the entire section 3).

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Undefined Behaviour this is:

int x = ++i * ++i * ++i;

Don't do it!!!!