第一题:用系统功能调用实现简单输入输出
利用系统功能调用从键盘输入,转换后在屏幕上显示,具体要求如下:
(1) 如果输入的是字母(A~Z,区分大小写)或数字(0~9),则将其转换成对应的英文单词后在屏幕上显示,对应关系见下表
(2) 若输入的不是字母或数字,则在屏幕上输出字符“*”,
(3) 每输入一个字符,即时转换并在屏幕上显示,
(4) 支持反复输入,直到按“?”键结束程序。
.data
u_word: .asciiz
"Alpha ","Bravo ","China ","Delta ","Echo ","Foxtrot ",
"Golf ","Hotel ","India ","Juliet ","Kilo ","Lima ",
"Mary ","November ","Oscar ","Paper ","Quebec ","Research ",
"Sierra ","Tango ","Uniform ","Victor ","Whisky ","X-ray ",
"Yankee ","Zulu "
uw_o