Commit b809aa4a authored by Alan Marchiori's avatar Alan Marchiori
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after class with example 

;
parent 5973f3b6

section01/Lec14/PH2.8 - Procedures.odp

+17.5 KiB (168 KiB)

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section01/Lec14/factorial_in_class.asm

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.data

	prompt: .asciiz "N = "

	sep:	.asciiz "\n"

.text

main:

	li $v0, 4

	la $a0, prompt

	syscall



	li $v0, 5

	syscall

	

	move $a0, $v0

	

	jal fact

	move $s0, $v0

	

	li $v0, 4

	la $a0, sep

	syscall



	li $v0, 1

	move $a0, $s0

	syscall

		

	li $v0, 10

	syscall

			

	

fact:	

	addi	$sp, $sp, -8

	sw	$ra, 0($sp)

	sw	$a0, 4($sp)

	

	beq 	$a0, $zero, done

	

	addi	$a0, $a0, -1

	jal	fact

	lw	$ra, 0($sp)

	lw	$a0, 4($sp)	

	mul	$v0, $v0, $a0

	addi	$sp, $sp, 8

	jr 	$ra

	

done:

	li 	$v0, 1	

	lw	$ra, 0($sp)

	#lw	$a0, 4($sp)

	addi	$sp, $sp, 8

	jr 	$ra

section01/Lec14/factorial_start.asm

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+52 −0
Original line number Diff line number Diff line 
.data

	prompt: .asciiz "N = "

	sep:	.asciiz "\n"

.text

main:

	li $v0, 4

	la $a0, prompt

	syscall



	li $v0, 5

	syscall

	

	move $a0, $v0

	

	jal fact

	move $s0, $v0

	

	li $v0, 4

	la $a0, sep

	syscall



	li $v0, 1

	move $a0, $s0

	syscall

		

	li $v0, 10

	syscall

			

	

fact:	

	addi	$sp, $sp, -8

	sw	$ra, 0($sp)

	sw	$a0, 4($sp)

	

	beq 	$a0, $zero, done

	

	addi	$a0, $a0, -1

	jal	fact

	lw	$ra, 0($sp)

	lw	$a0, 4($sp)	

	mul	$v0, $v0, $a0

	addi	$sp, $sp, 8

	jr 	$ra

	

done:

	li 	$v0, 1	

	lw	$ra, 0($sp)

	#lw	$a0, 4($sp)

	addi	$sp, $sp, 8

	jr 	$ra