Question

以下是我的代码，它可以正常工作。它输入并存储用户键入的数字（只能是3或4个数字的列表）。

然而，这真的很长，并且使用数组索引会少得多的代码并使用更少的寄存器，但我不知道如何做到这一点。我是否需要在source2周围放置括号以使其编入索引？

    # Entering the user's numbers

# Prompt user to enter their numbers
  la $a0, number            # load the address of number into $a0
  li $v0, 4             # 4 is the print_string syscall
  syscall

# Declare an array
la $t3, array           # load address of array into $t3
li $t4, 0           # index value 0 is the start of the memory address of the array
mul $t5, $t4, 4         # multiply index value by 4 because each element is four bytes
add $t5, $t3, $t5       # add base address of array to index value into $t5

# Get the first number from the user, put into $t1
li $v0, 5           # load syscall read_int into $v0
syscall             # make the syscall
move $t1, $v0           # move the number read into $t1
sw $t1, 0($t5)          # store number held in $t1 into memory address location $t5

# Get the second number from the user, put into $t2 and store in array
li      $v0, 5              # load syscall read_int into $v0
syscall                     # make the syscall
move $t1, $v0                           # move the number read into $t1
add $t5, $t5, 4                         # add 4 bytes to go to the next position in the array
sw $t1, 0($t5)          # store number into memory address location of $t5

# Get the third number from the user, put into $t3
li $v0, 5               # load syscall read_int into $v0
syscall                     # make the syscall
move $t1, $v0           # move the number read into $t1
add $t5, $t5, 4         # add 4 bytes to go to the next position in the array
sw $t1, 0($t5)          # store number into memory address location of $t5

# Branches to L3 if user chose to enter only three numbers
beq $t0, 3, L3          # if content in $t0 = 3, branch to L3

# Get the fourth number from the user, put into $t4
li $v0, 5               # load syscall read_int into $v0
syscall                 # make the syscall
move $t1, $v0           # move the number read into $t1
add $t5, $t5, 4         # add 4 bytes to go to the next position in the array
sw $t1, 0($t5)          # store number into memory address location of $t5

# Branches to L3 if user chose to enter only four numbers
beq $t0, 4, L3          # if content in $t0 = 4, branch to L3

编辑：到目前为止，我有这个......它不起作用 - 它不接受用户输入的整数

    loop:
    lw $t2, 0($a0) # load array element from memory
    addi $t2, $t2, 1 # increment element
    sw $t2, 0($a0) # write back to memory
    addi $a0, $a0, 4 # increment array pointer by 4 (word = 4 bytes)
    addi $t1, $t1, 1 # increment loop counter by 1
    blt $t1, $t0, loop # loop, if necessary

它不起作用，因为我已在$t0中有号码吗？我问用户他们想要什么数量的列表（3或4并存储在$t0中），但我要求他们输入他们的数字列表（我需要将其放入数组中）。如果我然后将此数组也放在$t0中。当提示说出他们想要的列表长度时，它是否会覆盖用户首先输入的数字？

MIPS汇编 - 简单查询如何将数字输入到数组中

0 个答案: