toHex

toHex is a function or method used in many programming environments to convert a numeric value into its hexadecimal string representation. The input is usually an integer, and the output is a string composed of the digits 0–9 and the letters a–f (or A–F).

The exact form of the result varies by language. Some implementations omit any prefix, while others add 0x or similar indicators. Some return lowercase digits, others uppercase, and many support fixed width formatting that pads the result with leading zeros to a specified width.

Negatives and non-integer inputs are handled differently across systems. Some implementations reject negatives or non-integers, while others represent negative numbers with a minus sign or using two's complement within a defined word size. Common simple uses include converting 255 to ff or FF, and zero to 0.

Similar functionality exists under different names in various libraries, such as Integer.toHexString in Java, toString(16) in JavaScript, and hex in Python, each with its own behavior details. Because there is no universal standard, consulting the language documentation is advised for exact rules.