Output who can explain?

Question

int x=1,y=1,z=1;
cout<<(++x||++y&&++z);
cout<<x<<y<<z;

In this case who can explain how answer will be 1211 ?
Why x's value changed but others did not ?

Answer 1

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https://www.sololearn.com/discuss/1009817/?ref=app
https://www.sololearn.com/discuss/1410916/?ref=app
https://www.sololearn.com/discuss/988067/?ref=app