错误的整数输出Mips

时间:2016-10-08 20:17:00

标签: assembly output mips mips32

使用此功能时输出错误:

li $v0, 1

我必须将用户输入保存为ASCII(从0到9),将其转换为整数,然后将其打印为整数。

但是当我在我的寄存器中有例如10时,它打印16;当我有20,它打印32,依此类推...它打印:my_number + 6 ^(n),我不知道为什么......

这是我的代码:

.data
num1:   .space 32
num2:   .space 32
entra:  .asciiz "Put your Decimal: "
sale:   .asciiz "\nDecimal is: "        
.globl __start
.text
__start:    
la $a0, entra           # print 1st text
li $v0, 4
syscall
la $s4, num1            # space to put the copy of user's word without \n

li $a1, 25              # space to put user's word (number)
li $v0, 8               # take input
la $a0, num2   
syscall


li $t1, -1          # counter to know how many times we iterate over EliminarEnter

jal EliminarEnter       # this function remove \n char and save it to $t4

jal Funcion         # getting the symbol of the char
li $v0, 10
syscall             # exit

EliminarEnter:
    addi $t1, $t1, 1        # increment counter
    lb $t2, 0($a0)          # take byte of users word
    beq $t2, 10 QuitarEnter     
    sb $t2, 0($s4)          # save the byte in $t4
    addi $s4, $s4, 1        
    addi $a0, $a0, 1        # increment pointer in the word

j EliminarEnter

QuitarEnter:        
    jr $ra          
Funcion:
    sub $s4, $s4, $t1       # go to the first memory adress

Bucle: 

    lb $t2, 0($s4)      
    beq $t2, $zero Acabar   # if char is null '\0' --> End of program
    addi $t3, $t2, -48  # -48, t get the symbol of my char
    j GuardarIncrementar


GuardarIncrementar:

    rol $t4, $t4, 4     # rol positions
    add $t4, $t4, $t3   # where I save the decimal number
    addi $s4, $s4, 1    # increment adress of my new ASCII word (without '\n')

    j Bucle

Acabar:


    la $a0, sale        # printing 2nd text
    li $v0, 4
    syscall



    add $v1, $zero, $t4
    move $v0, $v1       
    move $a0 , $v0
    li $v0, 1       # printing MY NUMBER... THING THAT DOESNT WORK!!!
    syscall
    jr $ra          # exit

2 个答案:

答案 0 :(得分:2)

你想做小数,所以在GuardarIncrementar

变化:

    rol $t4, $t4, 4     # rol positions

分为:

    mul $t4, $t4, 10    # multiply by base 10

答案 1 :(得分:0)

我认为您将每个输入数字转换为4位数字并使用

rol $t4, $t4, 4            # multiply by 16
add $t4, $t4, $t3          # and add the new digit

累积整数值。

将每个输入数字放在其整数的4位中,这意味着您将输入视为基数16(但不处理A-F)。

在10号基地,你需要乘以10而不是16,所以你不能使用单个班次或旋转。