MIPS汇编程序设计——四则运算计算器

实验目的

运用简单的MIPS实现一个能够整数加减乘除的计算器，同时使自己更加熟悉这些指令吧

MIPS代码

#sample example 'a small calculater’
# data section
.data
value:  .word , ,  , ,     # : first num , : second num ,  : operation , :result
msg0        :   .asciiz  " please choose the operation(1~4):\n\t\t1 : +,addition \n\t\t2 : -,subtracter\n\t\t3 : * multiplication \n\t\t4 : /,division\n"
msg1        :   .asciiz  "first num:"
msg2        :   .asciiz  "second num:"
addFlag     :   .asciiz  " + "
subFlag     :   .asciiz  " - "
mulFlag     :   .asciiz  " * "
divFlag     :   .asciiz  " / "
equalStr    :   .asciiz  " = "
newline     :   .asciiz  "\n==================================\n"
.text                       # text section
.globl main                 # call main by SPIM
main:
    la $t0, value           # load address "value" into $t0
    la $a0,msg0
    li $v0,
    syscall              #print "please choose the operation:"  

    li  $v0,
    syscall
    sw  $v0, ($t0)      #input operator

    la $a0,msg1
    li $v0,
    syscall              #print "first num:"  

    li  $v0,
    syscall
    sw  $v0, ($t0)      #read a

    la $a0,msg2
    li $v0,
    syscall              #print " second num:"  

    li  $v0,
    syscall
    sw  $v0, ($t0)      #read b 

    la $a0,newline
    li $v0,
    syscall              #print "\n"  

    lw $t1, ($t0)          # load the first num
    lw $t2, ($t0)          # load the second num
    lw $t3, ($t0)          # load the operation  

    beq $t3,,addOp         # if +
    beq $t3,,subOp         # if -
    beq $t3,,mulOp         # if *
    beq $t3,,divOp         # if /  

addOp:
    add $t4, $t1, $t2       # $t1 + $t2 = $t4
    sw $t4, ($t0)         #
    la $t5,addFlag
    j printResult
subOp:
    sub $t4, $t1, $t2       # $t1 - $t2 = $t4
    sw $t4, ($t0)
    la $t5,subFlag
    j printResult
mulOp:
    mul $t4, $t1, $t2       # $t1 * $t2 = $t4
    sw $t4, ($t0)
    la $t5,mulFlag
    j printResult
divOp:
    div $t4, $t1, $t2       # $t1 / $t2 = $t4
    sw $t4, ($t0)
    la $t5,divFlag
    j printResult  

printResult:
    lw $a0,($t0)
    li $v0,
    syscall             #read first number  

    la $a0,($t5)
    li $v0,
    syscall             #print opflag  

    lw $a0,($t0)
    li $v0,
    syscall             #print second number  

    la $a0,equalStr
    li $v0,
    syscall             #print " = "  

    lw $a0,($t0)
    li $v0,
    syscall             # print sum result
    j exit  

exit:
    la $a0,newline
    li $v0,
    syscall             #print " \n "  

    #j main
    li $v0,
    syscall             # exit  

参考链接：https://blog.csdn.net/oncoding/article/details/4346531