month.asm

题目一：设有10个学生的成绩分别为：56,69,84,82,73,88,99,63,100和80分。 试编写程序分别统计：低于60分

.model small
.data
input db 'please input a month number',0dh,0ah,'$'
show1 db 0dh,0ah,'input error!please input again!',0dh,0ah,'$'
tabel DW MONTH1
     DW MONTH2
     DW MONTH3
     DW MONTH4
     DW  MONTH5
     DW  MONTH6
     DW  MONTH7
     DW  MONTH8
     DW  MONTH9
     DW  MONTH10
     DW  MONTH11
     DW  MONTH12
JAN DB '=JAN',0DH,0AH,'$'
FEB DB '=FEB',0DH,0AH,'$'
MAR DB '=MAR',0DH,0AH,'$'
APR DB '=APR',0DH,0AH,'$'
MAY DB '=MAY',0DH,0AH,'$'
JUN DB '=JUN',0DH,0AH,'$'
JUL DB '=JUL',0DH,0AH,'$'
AUG DB '=AUG',0DH,0AH,'$'
SEP DB '=SEP',0DH,0AH,'$'
OCT DB '=OCT',0DH,0AH,'$'
NOV DB '=NOV',0DH,0AH,'$'
DECE DB '=DEC',0DH,0AH,'$'
.code
.startup
;
Mov ax,@data
Mov ds,ax
;
start:
Mov Dx,offset input
Mov Ah,09h
Int 21h

input1:
Mov Ah,01h ;输入第一个字符,存在al
Int 21h 
Mov bl,al   ;bl保存十位
cmp al,'0'
jl wrong
cmp al,'1'
ja wrong
;
input2:
Mov Ah,01h ;输入第二个字符,al保存个位
Int 21h
Cmp bl,'0'
je compare0;

cmp al,'0' ;十位为1
jb wrong
cmp al,'2'
ja wrong
Jmp show   ;输入正确的处理

compare0:  ;十位为0
cmp al,'1'
jb wrong
cmp al,'9'
ja wrong

show:      ;输入正确的处理
SUB AL,30H ;asc转换为数字
CMP BL,'0'
JE LAB0
ADD AL,10
LAB0:
DEC AL
MOV AH,0
SHL AL,1
MOV BX,AX

JMP tabel[BX] 
month1:  
      mov dx,offset jan	
      jmp start2
month2:  
      mov dx,offset feb	
      jmp start2
month3:  
      mov dx,offset mar	
      jmp start2
month4:  
      mov dx,offset apr	
      jmp start2	    
month5:  
      mov dx,offset may	
	    jmp start2	    
month6:  
      mov dx,offset jun	
	    jmp start2	    
month7:  
      mov dx,offset jul	
	    jmp start2   
month8: 
      mov dx,offset aug	
	    jmp start2	    
month9:  
      mov dx,offset sep	
	    jmp start2
month10:  
      mov dx,offset oct	
	    jmp start2	    
month11:  
      mov dx,offset nov	
	    jmp start2    
month12:  
      mov dx,offset dece	
	    jmp start2	    
START2:             ;输出缩写
      Mov Ah,09h
      Int 21h
	    jmp start
  
wrong:     ;输入错误
Mov dx,offset show1
Mov ah,09h
Int 21h
jmp input1
;

last:
.exit 0
end