汇编语言（三）之判断数值是否大于42H并统计个数

在内存中一串数值，判断数值是否大于42H并统计个数

程序运行：

代码：

datas  segment
  idata         equ 100h
  nums          db idata dup(41h,42h,43h,42h,41h,43h,30h)
  count         dw $-nums
  up            dw 0
  down          dw 0
  
  upNumber      db 'up:$'
  downNumber    db 0dh,0ah,'down:$'
  
datas ends

stacks segment


stacks ends

codes segment

main  proc  far

assume  cs:codes,ds:datas,ss:stacks

start:
           push ds                       
		   sub ax,ax
		   push ax
		   
		   mov ax,datas                   ;初始化ds
		   mov ds,ax
		   
		   mov cx,count
		   mov bx,0
		   s:
		      cmp nums[bx],42h
			  ja  upAdd                   ;如果muns[bx]>42h,则跳到up++
		      jb  downAdd   			  ;如果muns[bx]<42h,则跳到down++
			  jmp s1
		      upAdd:
		         inc up                   ;up++
			     jmp s1
		      downAdd:                  
		        inc down                  ;down++
			  
              s1:
				 inc bx
                 loop s				

		   ;输出up提示
		   lea dx,upNumber
		   mov ah,9
		   int 21h
		   
		   ;输出up
		   mov ax,up                  
		   call print
		   
		   
		   ;输出down提示
		   lea dx,downNumber
		   mov ah,9
		   int 21h
		   
		   ;输出down
		   mov ax,down 
           call	print	   
                           
		   ret
		  
main endp

print proc  near

        mov bx,10
        s: mov dx,0	       
           div bx
		   
		   add dx,30h
           push dx
		   inc cx
		   
		   cmp ax,0
           jnz s
		   
		   
		  
	  s1:  pop dx
	       mov ah,2
		   int 21h
		   loop s1
		   ret
print endp

codes ends

  end main