Question

我试图在程序集中编写一个程序，它将充当使用递归循环的复合兴趣计数器。我能够让程序使用设置的Principal并设置利率并且迭代10次，在每次迭代后显示平衡。现在我正在尝试更改，因此它要求用户提供起始本金，利率和目标本金。然后程序需要迭代直到满足目标主体。

到目前为止，这是我的非工作代码。我想我搞乱了我正在使用的寄存器。我尝试将这些在beq线上使用的寄存器更改为$ a2和$ a0，但这也没有用。有什么建议？ Idk如果我很近或离开。我很难跟上register = /

promptFirst:        .asciiz "Enter Your Starting Balance: \n"
promptSecond:       .asciiz "Enter the Interst Rate: \n"
promptThird:        .asciiz "Enter Your Target Balance \n"


promptNow:          .asciiz "\nYour Balance After A Iteration:\n"
.text
.globl main

main:   




     # Prints the first prompt  
     li $v0, 4               # syscall number 4 will print string whose address is in $a0       
     la $a0, promptFirst     # "load address" of the string
     syscall                 # actually print the string   

     # Reads in the first operand 
     li $v0, 5               # syscall number 5 will read an int
     syscall                 # actually read the int
     move $s0, $v0           # save result in $s0 for later


     # Prints the second prompt
     li $v0, 4               # syscall number 4 will print string whose address is in $a0   
     la $a0, promptSecond    # "load address" of the string
     syscall                 # actually print the string    

    # Reads in the second operand 
     li $v0, 5               # syscall number 5 will read an int
     syscall                 # actually read the int
     move $s1, $v0           # save result in $s1 for later

    # Prints the third prompt
     li $v0, 4               # syscall number 4 will print string whose address is in $a0   
     la $a0, promptThird    # "load address" of the string
     syscall                 # actually print the string    

    # Reads in the third operand 
     li $v0, 5               # syscall number 5 will read an int
     syscall                 # actually read the int
     move $s2, $v0           # save result in $s2 for later



jal LOOP

ENDLOOP:
j EXIT



LOOP:




    la  $a0, $s0    # load the address of the principal
    la  $a1, $s1    # load the address of the interest
    la  $a2, $s2    # load the address of the goal principal


    lwc1  $f2, ($a0)        # load the principal
    lwc1  $f4, ($a1)        # load the interest rate    
    lwc1  $f6  ($a2)

    mul.s $f12, $f4, $f2    # calculate the balance
    swc1  $f12, ($a0)

    li $v0, 4               # syscall number 4 will print      string whose address is in $a0   
    la $a0, promptNow       # "load address" of the string
    syscall                 # actually print the string
    li  $v0, 2              # system call #2    
    syscall

    addi $sp,$sp,-4     # push the current return address
    sw   $ra,($sp)      
    beq  $f12, $f6, LOOPRET

    beq $f12, $f6, ENDLOOP

    jal LOOP


LOOPRET:

    lw   $ra,($sp)      # pop the saved return address
    addi $sp,$sp,4      
    jr   $ra






EXIT:    
jr $ra

任何建议都会很好。对于我需要做的问题还有很多。但我需要首先完成这一部分。我觉得我已经筋疲力尽了

Answer 1

la  $a0, $s0    # load the address of the principal

这甚至可以编译吗？ la的目的是[L]或标签的[A]地址。您无法获取注册地址。

lwc1  $f2, ($a0)        # load the principal

将$a0中的错误值放在一边，lwc1不执行任何类型的整数到浮点转换。所以你不能通过这样做得到适当的浮动。

你可能应该做的是废弃la / lwc1指令，而是使用类似的内容：

mtc1 $s0,$f2     # move $s0 to floating point register $f2
cvt.s.w $f2,$f2  # convert the integer in $f2 to a float
# ..similarly for the rest of your values

大会计划问题

1 个答案: