What's wrong in this program.plz tell me

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The purpose of writing using namespace std; is that

The program will know to look in the std library to find the object. Namespace std contains all the classes, objects and functions of the standard C++ library.
JAZAKALLAH alam.so after writing using name space std we do not have to write other directives like <math>,<string> etc.?am i right?
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And a rusty nail is good enough for digging red-hot shrapnel out of your arm.
Dev-C++ is good enough for C++03.
The real point is not what anyone chooses to use.
It is what they choose to recommend.

The two may not be the same.
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