~計組~ MIPS 組語寫平方程式

因為最近在考試，就只有先PO上完成的程式碼當參考~

#squre(x)
.text
.globl main    
main:
square:
        la $t0,word
    
        la $a0,msg         #print message for calling for type in
        li $v0,4
        syscall
        
        li $v0,5           #Read_int
        syscall
        sw  $v0,0($t0)
        
        lw $t2,0($t0)        
                                
        
#不需要用 "li $t1,0" 或 "la $t1,word" 來 initialize $t1
#如果用 "la $t3,word",則運算元內容將會變成 address 而不是 value
        
Loop:
        beq $t1,$t2,EXIT   #$t1 is count, $t3 is sum, if i==x, than branch to EXIT
        add $t3,$t3,$t2    #j=j+x
        addi $t1,$t1,1     #increment i
        sw $t3,4($t0)

        j Loop        
EXIT:
        
        la $a0,ans         #print message of result prompt
        li $v0,4
        syscall
        
        lw $t4,4($t0)      #print the answer 
        li $v0,1
        move $a0,$t4
        syscall
        

        
.data
    msg:    .asciiz "請輸入一個數字："
    word: .word 0,0
    ans: .asciiz "平方的結果是："
        
        
#Finished by Veck Hsiao

System Service:
                Set $v0
  print_int      1
  print_float    2
  print_double   3
  print_string   4
  
  read_int       5
  read_float     6
  read_double    7
  read_string    8

  sbrk           9
  exit          10

 用法:
  li $v0,(immediate)   #這裡是設定所要執行的 System call
  syscall              #這一步就會執行對應的 System call