<iostream> istream cin; ostream cout; ostream cerr; ostream clog;
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<istream> class istream; class iostream;
<ostream> class ostream;
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<sstream> class istringstream; class ostringstream; class stringstream;
<fstream> class ifstream; class ofstream; class fstream;
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<ios> These don’t take an argument [no]boolalpha [no]showbase [no]showpoint [no]showpos [no]skipws [no]uppercase left / right / internal dec / hex / oct fixed / scientific
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<iomanip> These do take an argument resetiosflags setiosflags setbase setfill setprecision setw (non-sticky)
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