我一直在研究计算GCD和LCM的程序,然后将它们打印出来,但是我注意到我花了一半的代码只打印东西。我通过将文本块保存为:
来组织它Ask_Input_1:
.asciiz "Enter first integer n1: "
Ask_Input_2:
.asciiz "Enter second integer n2"
GCD_Out:
.asciiz "The greatest common divisor of : "
LCM_Out:
.asciiz "The least common multiple of "
AND:
.asciiz " and "
IS:
.asciiz " is "
然后用:
打印它们la, $a0, GCD_Out
li $v0, 4
syscall #print statement
la, $a0, ($s0)
li $v0, 1
syscall #print first number
la $a0, AND
li $v0, 4
syscall #print and
la $a0, ($s1)
li $v0, 1 #print second number
la $a0, IS
li $v0, 4
syscall #print is
每个函数大约需要10行,并且效率极低。必须有更好的方法,对吧?
答案 0 :(得分:1)
当然,define a macro为它:
.macro print_str (%str)
.data
myLabel: .asciiz %str
.text
li $v0, 4
la $a0, myLabel
syscall
.end_macro
.text
.globl main
main:
print_str("Enter first integer n1: ")
print_str("Enter second integer n2: ")
print_str("The greatest common divisor of : ")
li $v0,10
syscall
SPIM似乎不喜欢那个宏,但它在MARS中运行良好。如果你正在使用GNU汇编程序或其他东西,语法可能会略有不同。