std::uppercase, std::nouppercase
Min standard notice:
Header: <ios>
Enables the use of uppercase characters in floating-point and hexadecimal integer output. Has no effect on input.
# Declarations
std::ios_base& uppercase( std::ios_base& str );
std::ios_base& nouppercase( std::ios_base& str );
# Parameters
str: reference to I/O stream
# Return value
str (reference to the stream after manipulation).
# 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';
}