C++ cout hex values?

Use: #include <iostream> … std::cout << std::hex << a; There are many other options to control the exact formatting of the output number, such as leading zeros and upper/lower case.

Integer to hex string in C++

Use <iomanip>‘s std::hex. If you print, just send it to std::cout, if not, then use std::stringstream std::stringstream stream; stream << std::hex << your_int; std::string result( stream.str() ); You can prepend the first << with << “0x” or whatever you like if you wish. Other manips of interest are std::oct (octal) and std::dec (back to decimal). … Read more

How to get hex color value rather than RGB value?

TLDR Use this clean one-line function with both rgb and rgba support: const rgba2hex = (rgba) => `#${rgba.match(/^rgba?\((\d+),\s*(\d+),\s*(\d+)(?:,\s*(\d+\.{0,1}\d*))?\)$/).slice(1).map((n, i) => (i === 3 ? Math.round(parseFloat(n) * 255) : parseFloat(n)).toString(16).padStart(2, ‘0’).replace(‘NaN’, ”)).join(”)}` 2021 updated answer Much time has passed since I originally answered this question. Then cool ECMAScript 5 and 2015+ features become largely available on … Read more

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