io:width

C++ Reference

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width

Syntax:

    #include <fstream>
    int width();
    int width( int w );

The function width() returns the current width, which is defined as the minimum number of characters to display with the next output. The optional argument w can be used to set the width. For example:

     cout.width( 5 );
     cout << "2";

displays

(that's four spaces followed by a '2')