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Showing content from https://en.cppreference.com/w/cpp/language/../error/error_code/../../../cpp/io/manip/left.html below:

std::left, std::right, std::internal - cppreference.com

Modifies the positioning of the fill characters in an output stream. left and right apply to any type being output, internal applies to integer, floating-point, and monetary output. Has no effect on input.

The initial default for standard streams is equivalent to right.

This is an I/O manipulator. It may be called with an expression such as out << std::left for any out of type std::basic_ostream or with an expression such as in >> std::left for any in of type std::basic_istream.

str (reference to the stream after manipulation).

Output:

Default positioning:
*******-1.23
********0x2a
***USD *1.23
 
Left positioning:
-1.23*******
0x2a********
USD *1.23***
 
Internal positioning:
-*******1.23
0x********2a
USD ****1.23
 
Right positioning:
*******-1.23
********0x2a
***USD *1.23

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