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