Stringstream extract integer

Question

Why do I fail to extract an integer value into the Num variable?

#include 
#include 
#include 

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Answer 1

You have to reset all status flags (eofbit) and bring the stream into a good state (goodbit):

ss.clear(); // clear status flags
ss.str(Tokens[0]);

The reason is that if you keep extracting until the end, you will hit the end, and the eof flag will be set on that stream. After that, read operations will be canceled and you have to clear that flag out again. Anyway, after clearing and resetting the string, you can then go on extracting the integers.