Question

所以我只是在学习MIPS 32并且很难从用户那里获得一个整数值，然后将其打印回来。这就是我所拥有的：

.text

    main:
    la $a0, str1  #put the address of the string to display in register $a0
    li $v0, 4     #move 4 to the register $v0. This is the system service to display string messages
    syscall       #system call to output str1

    li $v0, 5     #load system service to read integer
    syscall       #Integer inputted is saved to register $v0
    sw $v0, x     #store contents of $t0 into x, x = $t0

    la $a0, x     #put the address of x to display in $a0
    li $v0, 4     #4 = system service to display strings
    syscall       #system call to output x


    .data
    x: .word 0
    y: .word 0
    z: .word 0
    str1: .asciiz "Please enter the value for X:";
    str2: .asciiz "Please enter the value for Y:";
    str3: .asciiz "Please enter the value for Z:";

输入1将'r'打印到控制台窗口。

Answer 1

假设我们正在谈论MARS，则调用5将在$v0中返回一个整数，而调用4将打印以NULL结尾的ASCII字符串。整数不是以NULL结尾的ASCII字符串。

您可能希望通过调用服务1和x的calue而不是其地址来替换最终调用。所以：

lw $a0, x     #put the address of x to display in $a0
li $v0, 1     #1 = system service to display an integer
syscall       #system call to output x

mips 32不打印整数值

1 个答案: