编写一个MIPS汇编程序,用递归方式实现斐波那契数列前n项的输出
时间: 2024-02-21 07:01:58 浏览: 117
mips汇编语言实现斐波那契数列的排列
好的,下面是一个MIPS汇编程序,用递归方式实现斐波那契数列前n项的输出:
```
.data
output: .asciiz "The first %d terms of the Fibonacci sequence are: \n"
.align 2
.text
.globl main
main:
li $v0, 4 # print the output message
la $a0, output
syscall
li $v0, 5 # read in the value of n
syscall
move $s0, $v0 # save the value of n in register s0
addi $s1, $zero, 0 # initialize the first term to 0
addi $s2, $zero, 1 # initialize the second term to 1
addi $s3, $zero, 2 # initialize the counter to 2
j fib # jump to the fib subroutine
fib:
beq $s3, $s0, done # if the counter reaches n, exit the subroutine
add $s4, $s1, $s2 # calculate the next term in the sequence
move $s1, $s2 # shift the previous two terms forward
move $s2, $s4
li $v0, 1 # print the current term
move $a0, $s4
syscall
li $v0, 4 # print a space
la $a0, " "
syscall
addi $s3, $s3, 1 # increment the counter
j fib # jump to the beginning of the subroutine
done:
li $v0, 10 # exit the program
syscall
```
这个程序首先输出一个提示消息,要求用户输入要计算的斐波那契数列的项数n。然后,它使用寄存器s0保存n的值,并将寄存器s1和s2初始化为斐波那契数列的前两个数0和1。然后,它使用一个计数器s3来迭代地计算斐波那契数列的每一项。在循环的每一次迭代中,它使用寄存器s4来计算当前的斐波那契数,并将寄存器s1和s2向前移动,以便在下一次迭代中计算下一个数。最后,它打印出计算出的斐波那契数列的每一项,并在它们之间打印一个空格。
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