Problem with logic operators and pre-incrementation

Question

This code :

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

set x to 2 but y and z stay to 1 (no incrementation)
I don't understand why since pre-incrementation takes prority over logical operations.

I missed something ?

Answer 1

No, you didn't miss anything, and yes pre-increment operator has higher priority over logical OR operator.

++x increments <x> value to 2. Now, remembering that any non zero value is considered truthy, and that logical OR operator only need the first truthy evaluation result to conclude, then <x> value is enough to draw a conclusion.

The rest of the operands to the right of the logical OR operator can be abandoned as the evaluation had been completed.

Answer 2

Important rule of or operater if first condition is true it will skip all of the rest conditions

Answer 3

Thanks @Ipang and @Geek.

I saw the light !