IME full-width and half-width

Then the whole/half-angle difference, in popular words, only the difference is only in addition to Chinese characters (such as punctuation, letters, numbers, etc.) occupy the position of the size, on the computer screen, a Chinese character to occupy two English characters position, people put an English character occupies the position of "half angle", The position of a Chinese character is referred to as the "full angle". In the Chinese character input, the system provides "half-width" and "full-width" Two different input states, but for English letters, symbols and numbers, such as the general characters are different from Chinese characters, in the half-width state they are treated as English characters, and in the full-width state, they can be treated as Chinese characters.

IME full-width and half-width