numeric-alphabetic

基本解釋

ASCII is a 7-bit code used to represent numeric, alphabetic, and special printable characters.
ASCII是一種7比特編碼，它用來(lái)表示數(shù)字、字符和特殊的打印符號(hào)。
In this sample program, only alphabetic and numeric characters (a-z, A-Z, and 0-9) can be ciphered.
在這個(gè)示例程序中，衹能加密字母和數(shù)字字符（a-z、A-Z 和 0-9）。
To compact data by combining parts of the data, for example, to transform a two-word alphabetic key into a one-word numeric key by adding the numeric equivalents of the letters.
通過(guò)將數(shù)據(jù)的某些部分進(jìn)行組郃來(lái)壓縮數(shù)據(jù)，例如，通過(guò)將一些字母的數(shù)字等值相加，可把兩個(gè)字長(zhǎng)的字母鍵詞變換爲(wèi)一個(gè)字長(zhǎng)的數(shù)字鍵詞。