一,从键盘键入一个字符，若是小写字母则将其转换为大写字母显示。

二,从键盘键入一个字符，若是小写字母则找出它的前导字符和后继字符，再按顺序显示这三个字符。

三,试编一程序，要求能从键盘接收一个个位数N，然后响铃N次（响铃符的ASCII码为07）。-one, from the keyboard to type in a character, if lowercase letters will be converted into capital letters show. Two, from the keyboard to type in a character, if lowercase letters will find its characters and the subsequent pre-characters according to the order indicated that three characters. 3, a trial procedures, requirements from the keyboard to receive a single-digit N, then N Bell (Bell website for the ASCII 07).