Various coding, binary

Octal is the size of each digit from 0 to 7,octal, the abbreviation Oct or o; hexadecimal is the size of each digit from 0 to F, abbreviated to Hex, and the binary each bit is 0 to 1, the decimal bit is 0 to 9,

Unicode is enough to encode all the languages on the Earth, so what ASCII can say is, of course, all of the Unicode included. Unicode itself is only 2 bytes, the reason why utf-8,utf-16 and so on, that is to target different application environment, improve the overall coding efficiency, such as if an article is mostly English (single-byte can be expressed), it is more appropriate to use UTF-8, And if the vast majority of Chinese (need double-byte), it may be utf-16 more appropriate. Reference:http://blog.csdn.net/yulongli/article/details/22894645

Various coding, binary