The first character must be a number between 1 and 9, and the next three characters must be a number between 0 and 9 or an uppercase character between A and Z (see Listing 4).
第一个字符必须是 1 到 9 间的数字,后三个字符必须是 0 到 9 间的数字或是 A 到 Z 间的大写字符(参见 清单 4)。
A key that, when pressed in combination with another key, gives the other key an alternative meaning; for example, producing an uppercase character when a letter key is pressed.
当一个键与另一个键组合使用时,它可改变另一个键的含义,例如,在按下某个字母键时产生大写字母。
To illustrate the technique, I'll write a function that takes the address of an ASCII character, loads it, converts it to uppercase, and stores it back.
为了演示这个技术,我特意编写了一个函数,该函数接受一个ASCII字符、加载它、将其转换成大写并存储回去。
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