![]() Recalling that a byte is a pair of hex digits, the leading zeros help to indicate the number of bytes being used to represent the numbers. Just a small point but you’ll note that the code points in the table have a number of leading zeros, for example 0080. Code point rangeġ1110 www 10 zz zzzz 10 yyyy yy 10 xxxxxx To convert code points into UTF-8 byte sequences the code points are divided up into the following ranges and use the UTF-8 conversion pattern shown in the following table to map each code point value into a series of bytes. Each byte can be represented by a pair of hex digits. Consequently, for numbers between 10 and 15 we choose to represent them in hex as followsĬonsequently, 251 written in hex, is represented as F x 16 1 + B x 16 0, so that 251 = FB in hex. If we use 16 as the base (called hexidecimal), 251 can be written as 16 1Īh, but writing 251 as “1511” in hex (= 15 x 16 1 + 11 x 16 0) is very confusing and problematic. If we use 8 as the base (called octal), 251 can be written as 8 2 Starting with binary (base 2) we can write 251 as 2 7 Note: x 0 = 1 for any value of x not equal to 0. However, we can use other bases including 2 (binary), 8 (octal) and 16 (hex). Here we are breaking 251 down into powers of 10: 10 2, 10 1 and 10 0. Consider the decimal number 251 which can be written as 251 = 2 x 10 2 + 5 x 10 1 + 1 x 10 0 = 200 + 50 + 1.
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