you know usingnamespace std in the global scope is a bad habbit, is it okay to put it in main or other blocks?

writing std: all the time is good practice i know but when im just putting something together to see if i learnt correctly its too tempting to just whack using namespace std at the top, bad habbit i know, specialy in practice of all places.

just theres not so likley going to be a namespace leak if you pop it between {} these right?

would that be a better habbit?
Remember you could do something like this inside main() or other function.
    using std::string;
    using std::printf;
    using std::cout;
    using std::endl;

That keeps the body of the code uncluttered as before, but gives much tighter control.
A better habit would be to use the "std::" prefix or a using declaration (like Chervil has provided above).
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Prefer Using Declarations to Using Directive but prefer full scope resolution to Using Declarations.

See the following for the differences between Using Declarations and Using Directive:
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