std::cout
[CPP Insertion Operator](https://texonom.com/cpp-insertion-operator-3c2df5a253eb4f5eb8357f542a46691a) [printf](https://texonom.com/printf-151562c906224df9903041e9381934bd) 


### Character out
print without [C Conversion Specifier](https://texonom.com/c-conversion-specifier-dc219cfb83c5404e80006440baf3fba4) 

- `cout.setf(ios::fixed)` (set format)
> - `ios::dec`: sets the basefield format to decimal (base 10).
> - `ios::hex`: sets the basefield format to hexadecimal (base 16).
> - `ios::oct`: sets the basefield format to octal (base 8).
> - `ios::fixed`: sets the floatfield format to fixed-point notation.
> - `ios::scientific`: sets the floatfield format to scientific notation.
> - `ios::left`: sets the adjustfield format to left alignment.
> - `ios::right`: sets the adjustfield format to right alignment.
> - `ios::internal`: sets the adjustfield format to internal alignment.
> - `ios::showpos`: displays the plus sign for positive numbers.
> - `ios::showbase`: displays the base prefix for non-decimal numbers.
> - `ios::uppercase`: displays the uppercase letters for hexadecimal numbers and the exponent in scientific notation.
- `cout.precision(2);`
> - 소수점 자리




`cout.put()` - stdout 1 char






