# 組語筆記(MIPS)

## 作業一
### 基本框架

.data

.text

### 印字串

.data
	output: .asciiz "Hello World!\n\0"
.text
	li $v0, 4
	la $a0, output
	syscall

### 印數字

.data
	number: .word 66
.text
	li $v0, 1
	lw $a0, number
	syscall

### 兩數和

.data
	output1: .asciiz "Enter a number: \0"
	output2: .asciiz "Enter another number: \0"
	output3: .asciiz "The sum is: "
.text
	# print "Enter a number: "
	li $v0, 4
	la $a0, output1
	syscall
	
	# read int
	li $v0, 5
	syscall
	
	# set t0 = input number
	move $t0, $v0
	
	# print "Enter another number: "
	li $v0, 4
	la $a0, output2
	syscall
	
	# read int
	li $v0, 5
	syscall
	
	# set t1 = input number
	move $t1, $v0
	
	# t0 = t0 + t1
	add $t0, $t0, $t1
	
	# print "The sum is "
	li $v0, 4
	la $a0, output3
	syscall
	
	# print sum
	li $v0, 1
	move $a0, $t0
	syscall

### 條件判斷

.data
	output: .asciiz "Please enter a number: \0"
	output1: .asciiz "Number is lager than 10!\n\0"
	output2: .asciiz "Number is equal to 10!\n\0"
	output3: .asciiz "Number is less than 10!\n\0"
.text
	# print "Please enter a number: "
	li $v0, 4
	la $a0, output
	syscall
	
	# read int
	li $v0, 5
	syscall
	
	# set t0 = input number
	move $t0, $v0
	
If:
	# if t0 == 10, goto Equal
	beq $t0, 10, Equal
	
	# if  t0 < 10, goto Less
	slti $t1, $t0, 10
	beq $t1, 1, Less
	
	# if t0 > 10
	# print "Number is larger than 10!"
	li $v0, 4
	la $a0, output1
	syscall
	
	# jump to End
	j End
Equal:
	# print "Number is equal to 10!"
	li $v0, 4
	la $a0, output2
	syscall
	
	# jump to End
	j End
Less:
	# print "Number is less than 10!"
	li $v0, 4
	la $a0, output3
	syscall
End:

## 作業二
### 印陣列

.data
	vector: .word 11,1,2,3,4,5,6,7
	newline: .asciiz "\n\0"
.text
	# set counter t0 = 0
	li $t0, 0
	# t1 = vector[0]
	la $t1, vector
	
loop:
	# if t0 == 8, goto Exit
	beq $t0, 8, Exit
	
	# t2 = vector[i]
	lw $t2, ($t1)
	
	# print vector[i]
	move $a0, $t2
	li $v0, 1
	syscall
	
	# print newline
	li $v0, 4
	la $a0, newline
	syscall
	
	# counter t0++
	addi $t0, $t0, 1
	# vector array go to next byte
	addi $t1, $t1, 4
	j loop
Exit:

### 讀字串&印字串

.data
	input: .space 1024
.text
	# read input string
	li $v0, 8
	la $a0, input
	li $a1, 20 # max allowance
	syscall
	
	# set t0 = string 
	move $t0, $a0
	
	# print string
	li $v0, 4
	la $a0, input
	syscall

### 讀字串&輸出長度

.data
	input: .space 1024
	output: .asciiz "The string length (including '\n') is \0"
.text
	# read input string
	li $v0, 8
	la $a0, input
	li $a1, 32 # max allowance
	syscall
	
	# set t0 = string 
	move $t0, $a0
	
	# set s0 =0 , count string length
	li $s0, 0
loop:
	# load one byte
	lb $s1, ($t0)
	# if s1 == '\0', break
	beqz $s1, Exit
	
	# counter++
	addi $s0, $s0, 1
	# go to next byte
	addi $t0, $t0, 1
	j loop
Exit:
	#print "The string length is "
	li $v0, 4
	la $a0, output
	syscall
	
	# print length
	li $v0, 1
	move $a0, $s0
	syscall

## 作業三
### 函數加法

.data
	
.text
	li $t0, 3
	li $t1, 5
	jal Add

	li $v0, 1
	move $a0, $t2
	syscall
	
	li $v0, 10 # end the program
	syscall
Add:
	add $t2, $t0, $t1
	jr $ra