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

std::uppercase, std::nouppercase - cppreference.com

Enables the use of uppercase characters in floating-point and hexadecimal integer output. Has no effect on input.

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

[edit] Parameters str - reference to I/O stream [edit] Return value

str (reference to the stream after manipulation).

[edit] Example
#include <iostream>
 
int main()
{
    std::cout << std::hex << std::showbase
              << "0x2a with uppercase: " << std::uppercase << 0x2a << '\n'
              << "0x2a with nouppercase: " << std::nouppercase << 0x2a << '\n'
              << "1e-10 with uppercase: " << std::uppercase << 1e-10 << '\n'
              << "1e-10 with nouppercase: " << std::nouppercase << 1e-10 << '\n';
}

Output:

0x2a with uppercase: 0X2A
0x2a with nouppercase: 0x2a
1e-10 with uppercase: 1E-10
1e-10 with nouppercase: 1e-10
[edit] See also

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