如果在MIPS大于或等于 [英] If greater than or equal in MIPS

问题描述

提示和输入的两个整数的a和b使用系统调用

Prompt for and input two integers "a" and "b" using syscalls

根据显示下列语句之一。如果A> B或A = B或

• 您输入大于a b

  Display one of the following statements depending on if a>b, or a=b or a

  • You entered a greater than b

    您输入了等于b

    您输入的不是一个更低的B

    You entered a less than b

    我一定要得到这样的提示，我那么努力完成它。这是我stucked，我真的AP preciate你的帮助。

    I have to get this prompt and I tried so hard to get it done. This is where I'm stucked, I'd really appreciate your help.

        .data  
    p1: .asciiz "Please enter the first number ? "  
    p2: .asciiz " Please enter the second number? "  
    ans1: .asciiz " \nYou entered a greater than b "  
    ans2: .asciiz " \nYou entered a equal to b "  
    ans3: .asciiz " \nYou entered a less than b "  
    
    
            .text
            .globl main
    
    main:    
        li $v0, 4     #system call code for print_str  
        la $a0, p1  #address of string to print  
        syscall     #print the first prompt  
    
    
        li $v0, 5   #system call code for read_int
        syscall     #read first integer
        move $t1, $v0   #store it till later
    
        li $v0, 4   #system call code for print_str
        la $a0, p2  #address of string to print
        syscall     #prints the second prompt
    
        li $v0, 5   #system call code for read_int
        syscall     #read first integer
        move $t2, $v0   #store it till later
    
        slt $t1,$s1,$s0      # checks if $s0 > $s1
        beq $t1,1,label1 
    

    我真的不知道如何使用分支语句，这真的令人困惑。我想知道如何解决它。

    I really don't know how to use branch statements, and it's really confusing. I would like to know how to fix it.

    推荐答案

    为什么你阅读数字到$ t1和t2的$然后比较$ s1和$ S0？它在哪里混乱？

    Why do you read the numbers into $t1 and $t2 then compare $s1 and $s0? Where is it confusing?

    只需使用SLT和BEQ / BNE，那会掩盖你需要所有的比较情况。

    Simply use slt and beq/bne, that'll cover all comparison cases you need.

    假设一个在$ S0，b为$ S1

    Suppose a is in $s0, b is in $s1

    a < b:
    slt $t0, $s0, $s1
    bne a_lt_b, $t0, $zero # $t0 == 1 != 0 if a < b
    
    a = b:
    beq a_eq_b, $s0, $s1   # nothing more to explain
    
    a > b:
    slt $t0, $s1, $s0
    bne b_lt_a, $t0, $zero # $t0 == 1 != 0 if b < a
    
    a >= b:
    slt $t0, $s0, $s1
    beq a_ge_b, $t0, $zero # $t0 == 0 if a >= b or !(a < b)
    
    a <= b:
    slt $t0, $s1, $s0
    beq b_ge_a, $t0, $zero # $t0 == 0 if b >= a or !(b < a)
    

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