Namely code similar to this, making the printout undefined.
int a=41; a++ & printf("%d\n", a);
I don't know what exactly this operation is called.
What's so illegal about this operation
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The problem is that it is not specified which is evaluated first, the
printfor thea++, and since one has a side effect on the other (you either readathen write it then read it again, or read it then read it then write it), you get undefined behaviour.