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Consider this code:
int a = 5;
if (a == 5 || a == 10)
doSomething();
In this case a is 5 so the first condition is true. Will the program check if the second condition is true or it will start executing doSomething() immediately after it makes sure that a is really 5?
It will start executing immediately. This is known as short-circuit evaluation.
http://en.wikipedia.org/wiki/Short-circuit_evaluation