MIPS彙編語言

Question

我正在嘗試編寫MIPS彙編語言，提示用戶輸入描述系統屏幕的兩個維度（用像素表示）的兩個數字，然後計算並打印屏幕的像素數。

例如，在C++：

int width,height,result; 
cout<<"Enter width of the device screen: "; 
cin>>width; 
cout<<"Enter height of the device screen: "; 
cout>>height; 
result=width*height; 
cout<<"The result of the Iphone 4S in pixel: "<<result; 

（這是我第一次寫這個MIPS彙編，所以我相信這個代碼是錯誤的，我需要有人幫我更正下面這個代碼和解釋。 。我請）

.data 
str1: .asciiz "Enter width of the device screen: " 
str2: .asciiz "Enter height of the device screen: " 
str3: .asciiz "The result of the Iphone 4S in pixel: " 
newline: .asciiz "\n" 

main: 
li $v0,4 #system call code for print string 
la $a0,str1 #address of str1 
syscall #print str1 

#get the first number from the user, put into $s0 
li $v0,5 #system call for read input 
syscall #read integer into $v0 from console. 
move $s0,$v0 #move the number read into $s0 

#read input string for str2 
li $v0,4 #system call code for print string 
la $a0,str2 #address of str2 
syscall #print str2 

#get the second number from the user, put into $s1 
li $v0,5 #system call for read input 
syscall #read integer into $v0 from console. 
move $s1,$v0 #move the number read into $s0 

#do the calculation 
mul $s2,$s0,$s1 # s2 is the register to store $s0 and $s1 from the user input. 

#read print string for st3 
li $v0,4 #system call code for print string 

#print width*height 
li $v0,1 
move $ao,$s2 #move the result of multiplication into $a0 to print 
syscall 

Answer 1

你的程序是非常接近 - 你只是有幾個問題：

1. 您錯過了.text指令。這可能應該在newline行之後，並且在main:之前。

2. 你有一個$ao你可能想要一個$a0接近程序結束。您li $v0,4 #system call code for print string行之後

   la $a0,str3 #address of str3 
   syscall 
   

   ：你需要添加 -

3. 你沒有以往打印str3。

4. 你應該確保在你的程序的末尾添加exit系統調用：

   li $v0,10 
   syscall 
   

Answer 2

.data 
str1: .asciiz "Enter width of the device screen: " 
str2: .asciiz "Enter height of the device screen: " 
str3: .asciiz "The result of the Iphone 4S in pixel: " 
newline: .asciiz "\n" 
     .text 

main: 
li $v0,4      #system call code for print string 
la $a0,str1     #address of str1 
syscall      #print str1 

           #get the first number from the user, put into $s0 
li $v0,5 #system call for read input 
syscall #read integer into $v0 from console. 
move $s0,$v0 #move the number read into $s0 

#read input string for str2 
li $v0,4 #system call code for print string 
la $a0,str2 #address of str2 
syscall #print str2 

#get the second number from the user, put into $s1 
li $v0,5 #system call for read input 
syscall #read integer into $v0 from console. 
move $s1,$v0 #move the number read into $s0 

#do the calculation 
mul $s2,$s0,$s1 # s2 is the register to store $s0 and $s1 from the user input. 

#read print string for st3 
li $v0,4 #system call code for print string 
la $a0, str3 
syscall 
#print width*height 
li $v0,1 
move $a0,$s2 #move the result of multiplication into $a0 to print 
syscall 
# 
li $v0, 10 
syscall