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I have a question about Pre-processor directives in c++:
For example:
#ifndef QUESTION
//some code here
#ifndef QUESTION
//some code here
#endif
#endif
Can we use it in this way, and can the C++ compiler match the ifndef and endif in the right way?
Yes, we can. The
#endifstatement matches to the previous#if#ifdefor#ifndefetc for which there hasn’t been a corresponding#endif.e.g.