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yeah, you're right. It's just an illusion, I understand now, thanx~

Ah, I understand, the 1st if statement is just independent, it has no relationship with the if - elseif (the latter one is a group) which comes later, the computer will test the 1st "if", and it will...

I read the book of K&R "The C Programming Language (Second Edition)", in the part 1.5.4 (words counting), it shows a programm(See the end).

This program is OK, but I don't know how the if-else...