1 .data
  2 
  3 string1: .asciiz "*\n"
  4 
  5 
  6 bstring:    .asciiz
  7             "Alpha ","Bravo ","China ","Delta ","Echo ","Foxtrot ",
  8             "Golf ","Hotel ","India ","Juliet ","Kilo ","Lima ",
  9             "Mary ","November ","Oscar ","Paper ","Quebec ","Research ",
 10             "
 
Sierra ","Tango ","Uniform ","Victor ","Whisky ","X-ray ",
 11             "Yankee ","Zulu "
 12 
 13 boffset:    .word
 14             0,7,14,21,28,34,43,49,56,63,71,
 15             77,83,89,99,106,113,121,131,
 16             139,146,155,163,171,178,186
 17 
 18 
 19 nstring:    .asciiz
 20             "
 
zero ", "First ", "Second ", "Third ", "Fourth ",
 21             "Fifth ", "Sixth ", "Seventh ","Eighth ","Ninth "   
 22 
 23 noffset:    .word
 24             0,6,13,21,28,36,43,50,59,67
 25 
 26 
 27 sstring:    .asciiz
 28             "alpha ","bravo ","china ","delta ","echo ","foxtrot ",
 29             "
 
golf ","hotel ","india ","juliet ","kilo ","lima ",
 30             "mary ","november ","oscar ","paper ","quebec ","research ",
 31             "sierra ","tango ","uniform ","victor ","whisky ","x-ray ",
 32             "yankee ","zulu "         
 33 
 34 soffset:    .word
 35             0,7,14,21,28,34,43,49,56,63,71,
 36             77,83,89,99,106,113,121,131,
 37             139,146,155,163,171,178,186
 38 
 39 
 40 
 41 .text
 42 
 43 loop:
 44 
 45 li $v0,12
 46 syscall
 47 
 48 move $t2,$v0
 49 
 50 move $t0,$t2
 51 li $t1,63
 52 beq $t0,$t1,exit
 53 
 54 move $t0,$t2
 55 li $t1,122
 56 bgt $t0,$t1,other
 57 
 58 move $t0,$t2
 59 li $t1,48
 60 blt $t0,$t1,other
 61 
 62 move $t0,$t2
 63 li $t1,57
 64 ble $t0,$t1,number
 65 
 66 move $t0,$t2
 67 li $t1,65
 68 blt $t0,$t1,other
 69 
 70 move $t0,$t2
 71 li $t1,90
 72 ble $t0,$t1,big
 73 
 74 move $t0,$t2
 75 li $t1,97
 76 blt $t0,$t1,other
 77 
 78 #print Lower case letters
 79 
 80 addi $t0,$t0,-97
 81 la $t1,soffset
 82 sll $t0,$t0,2
 83 add $t0,$t0,$t1
 84 lw $t1,($t0)
 85 la $t0,sstring
 86 add $t0,$t0,$t1
 87 move $a0,$t0
 88 li $v0,4
 89 syscall
 90 j loop
 91 
 92 other:
 93 
 94 la $a0,string1
 95 li $v0,4
 96 syscall
 97 j loop
 98 
 99 number:
100 
101 addi $t0,$t0,-48
102 la $t1,noffset
103 sll $t0,$t0,2
104 add $t0,$t0,$t1
105 lw $t1,($t0)
106 la $t0,nstring
107 add $t0,$t0,$t1
108 move $a0,$t0
109 li $v0,4
110 syscall
111 j loop
112 
113 #print Upper case letters
114 big:
115 
116 addi $t0,$t0,-65
117 la $t1,boffset
118 sll $t0,$t0,2
119 add $t0,$t0,$t1
120 lw $t1,($t0)
121 la $t0,bstring
122 add $t0,$t0,$t1
123 move $a0,$t0
124 li $v0,4
125 syscall
126 j loop
127 
128 exit:
129 
130 li $v0,10
131 syscall

第一題的算法文字描述:

調用系統功能輸入數據

轉換數據

(1) 如果輸入的是字母（A~Z，區分大小寫）或數字（0~9），則將其轉換成對應的英文單詞

(2) 若輸入的不是字母或數字，轉換成“*”，

每輸入一個字符，即時轉換並在屏幕上顯示，

支持反復輸入，直到按“?”鍵結束程序。

對應的偽碼:

 1 if(n<=122)
 2     if(n>=48)
 3         if(n<=57)
 4             goto number
 5         if(n<65)
 6             goto ‘*‘    
 7         else
 8             if(n<=90)
 9                 goto big
10             if(n<97)
11                 goto ‘*‘     
12             if(n>=97)
13                 goto small    
14     else
15         goto ‘*‘
16 else
17     goto ‘*‘    

第一次互評作業：MIPS匯編程序設計