汇编语言程序设计:[2]判断闰年程序
1、打开masm汇编编译程序,新建一个masm源文件脚本。
DATAS SEGMENT
;此处输入数据段代码
DATAS ENDS
STACKS SEGMENT
;此处输入堆栈段代码
STACKS ENDS
CODES SEGMENT
ASSUME CS:CODES,DS:DATAS,SS:STACKS
START:
MOV AX,DATAS
MOV DS,AX
;此处输入代码段代码
MOV AH,4CH
INT 21H
CODES ENDS
END START
2、在正文中输入我们的程序代码,并将文件命名为testleap.asm
data segment ;定义数据段
infon db 0dh,0ah,'xiaobo leap test Designed by 1wangxiaobo@163.com',0dh,0ah,'Please input a year: $'
Y db 0dh,0ah,'This is a leap year! $'
N db 0dh,0ah,'This is not a leap year! $'
w dw 0
buf db 8
db ?
db 8 dup(?)
data ends
stack segment stack
db 200 dup(0)
stack ends
code segment
assume ds:data,ss:stack,cs:code
start:mov ax,data
mov ds,ax
lea dx,infon ;在屏幕上显示提示信息
mov ah,9
int 21h
lea dx,buf ;从键盘输入年份字符串
mov ah,10
int 21h
mov cl, [buf+1]
lea di,buf+2
call datacate
call ifyears
jc a1
lea dx,n
mov ah,9
int 21h
jmp exit
a1: lea dx,y
mov ah,9
int 21h
exit: mov ah,4ch
int 21h
datacate PROC near
push cx;
dec cx
lea si,buf+2
tt1: inc si
loop tt1
;lea si,cx[di]
pop cx
mov dh,30h
mov bl,10
mov ax,1
l1: push ax
sub byte ptr [si],dh
mul byte ptr [si]
add w,ax
pop ax
mul bl
dec si
loop l1
ret
datacate ENDP
ifyears proc near
push bx
push cx
push dx
mov ax,w
mov cx,ax
mov dx,0
mov bx,4
div bx
cmp dx,0
jnz lab1
mov ax,cx
mov bx,100
div bx
cmp dx,0
jnz lab2
mov ax,cx
mov bx,400
div bx
cmp dx,0
jz lab2
lab1: clc
jmp lab3
lab2: stc
lab3: pop dx
pop cx
pop bx
ret
ifyears endp
code ends
end start
3、运行我们编辑的文件,按提示输入 例 四位数字 1988 就会显示This is a leap year!表示为 闰年 如果不是显示This is not a leap year! 就是闰年
xiaobo leap test Designed by 1wangxiaobo@163.com
Please input a year: 1988
This is a leap year!
Press any key to continue