1 #Program Description: 2 #Author:Jeremy 3 #Creation Date:2012/9/25 10:21 4 #Revisions: 5 #Date: #Modified by: 6 7 #寫一個組合語言程式，輸一整數 n， 印出 其絕對值。 8 .section .data 9 msg: .asciz "請輸入一整數:" 10 n: .int 0 11 ifmt:.asciz "%d" 12 ofmt:.asciz "the abs value is %d" 13 .section .text 14 .globl _main 15 _main: 16 pushl $msg 17 call _printf 18 addl $4, %esp 19 20 pushl $n 21 pushl $ifmt 22 call _scanf # scanf("%d",&n) 23 addl $8, %esp 24 25 cmp $0, n # 數值一定要在前面 26 jge postive # n >= 0 ? 27 movl $0, %eax 28 subl n, %eax # subl 目標欄位必為register 29 pushl %eax 30 pushl $ofmt 31 call _printf 32 addl $4, %esp 33 jmp quit 34 postive: 35 pushl n #printf("%d",n) 36 pushl $ofmt 37 call _printf 38 addl $4, %esp 39 quit: 40 pushl $0 41 call _exit 42