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when i start programming i use only one source code so i put libraries and namespace in the first of my code ... now i using two source code as one main and second to define functions(need cout,cin,any other impeded functions as algorithm's) and a header file for prototype ... finally i found a big annoy as i don't know where exactly put my includes and using namespace std; to be used in a hall program not only in one source code ...

Amr Ashraf
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    Better [not put `using namespace std` anywhere](http://stackoverflow.com/questions/1452721/why-is-using-namespace-std-considered-bad-practice). Bad idea, more often than not. – juanchopanza Mar 24 '15 at 22:26
  • I'm not sure what you are asking. You want to avoid including the standard headers in so many places? – Neil Kirk Mar 24 '15 at 22:26
  • yes that's i mean i want to avoid including the standard headers in so many places – Amr Ashraf Mar 25 '15 at 16:56

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