汇编语言（二十五）之成绩分段统计

已知一个班的成绩，进行60,70,80,90,100分段统计

程序运行：

代码：

datas segment
       
	  students_number  dw 10
      students         dw 76,69,84,90,73,88,99,63,100,80

	  s6      dw  0h
	  s7      dw  0h
	  s8      dw  0h
	  s9      dw  0h
	  s10     dw  0h
	  
	  output_s6    db 's6=$'
	  output_s7    db 0dh,0ah,'s7=$'
	  output_s8    db 0dh,0ah,'s8=$'
	  output_s9    db 0dh,0ah,'s9=$'
	  output_s10   db 0dh,0ah,'s10=$'
	  
datas ends

stacks segment stack

    db  100h dup(?)

stacks ends

codes segment

assume cs:codes,ds:datas,ss:stacks
main   proc  far
start:
       push ds
	   mov ax,0h
	   push ax
       mov ax,datas          ;初始化ds
	   mov ds,ax
       
       mov cx,students_number
	   cmp cx,0 
	   jz no_student
	   mov si,0
      s:
	   mov ax,students[si]
       cmp ax,100
	   ja  next
	   jb  low100
	   inc s10             ;为100，计数器s10加一
	   jmp next
	 low100:
	   cmp ax,90 
	   jb low90
	   inc s9              ;为90-99，计数器s9加一
	   jmp next
	 low90:
	   cmp ax,80 
	   jb low80
	   inc s8              ;为80-89，计数器s8加一
	   jmp next
	 low80:
	   cmp ax,70 
	   jb low70
	   inc s7             ;为70-79，计数器s7加一
	   jmp next
     low70:
	   cmp ax,60 
	   jb next
	   inc s6            ;为60-69，计数器s6加一
    next:   
	   add si,type students
	   loop s 
	 
    lea dx,output_s6          ;输出s6
    mov ah,9
	int 21h	
	mov ax,s6
	call print_decimal
	
	lea dx,output_s7          ;输出s7
    mov ah,9
	int 21h	
	mov ax,s7
	call print_decimal
	
	lea dx,output_s8          ;输出s8
    mov ah,9
	int 21h	
	mov ax,s8
	call print_decimal
	
	lea dx,output_s9         ;输出s9
    mov ah,9
	int 21h	
	mov ax,s9
	call print_decimal
	
	lea dx,output_s10        ;输出s10
    mov ah,9
	int 21h	
	mov ax,s10
	call print_decimal
	
	jmp exit
	
    no_student:
    
    exit:
   
       ret
	   
main endp
print_decimal proc near  uses ax bx cx dx 
    
	    mov cx,0
	    mov bx,10 
	  de: 
	    xor dx,dx 
        div bx 
        push dx 
        inc cx 
        cmp ax,0 
        jnz de 
      de1:
        pop dx 
        add dl,30h 
        mov ah,2 
        int 21h 
        loop de1
		
	    ret 
print_decimal endp 
codes ends

end main