heksadesimaalimerkillä

Heksadesimaalimerkillä refers to the hexadecimal numeral system, also known as base-16. This system uses sixteen distinct symbols, with the first ten being the standard Arabic numerals 0 through 9, and the remaining six being the letters A, B, C, D, E, and F. These letters represent the decimal values 10 through 15, respectively.

The hexadecimal system is widely used in computer science and digital electronics. Its popularity stems from its ability to represent binary-coded values more compactly and readably than pure binary. Each hexadecimal digit can represent exactly four binary digits (bits), as 2^4 = 16. This makes conversion between binary and hexadecimal straightforward. For example, the binary number 1111 is equivalent to the hexadecimal digit F, and the binary number 1010 is equivalent to the hexadecimal digit A.

In practice, hexadecimal notation is often used to represent memory addresses, character encodings, and color codes. For instance, in web design, colors are frequently specified using a hexadecimal string, such as #FF0000, which represents pure red. This string translates to 255 for the red component, 0 for green, and 0 for blue in the RGB color model. The "0x" prefix is commonly used to denote a hexadecimal number in programming contexts, such as 0xFF to represent the decimal value 255.