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About an exercice an K&B book

 
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Hi can anyone plase explain why the correct answers are C & E
and where did he get those numbers !
here is the code :
 
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D is wrong because it is showing 3 id's when only 2 threads where started.
 
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John Mercier wrote:D is wrong because it is showing 3 id's when only 2 threads where started.


Thanks for answer John , you are absolutly right ! thanks
 
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