24个汇编实例小程序(3)

mov ah,1 int 21h cmp al,'a' jl l cmp al,'z' jg l

mov cl,al

lea dx,crlf mov int lea dx,h2 mov ah,9

int 21h

dec mov mov int

mov mov int

inc mov

mov ah,2

int 21h

mov mov int

inc mov mov

int 21h

mov int main endp

s3 ends

end

ah,9 21H cl

dl,cl ah,2 21h dl,' ' ah,2 21h

cl

dl,cl dl,' ' ah,2 21h

cl

dl,cl ah,2 ah,4ch 21H main ;输出前导字符 ;输出该字符

;输出后导字符 6.把一个包含20个数据的数组M分成两组：正整数组P和负整数组N，分别把这两个数组中的数据的个数显示出来

s1 segment stack

dw 100h dup(?) top label word s1 ends

s2 segment

h1 db 'the positive number is: ','$' h2 db 'the negative number is: ','$' crlf db 0dh,0ah,24h

array dw 50h,-11h,61h,-22h,72h,-33h,73h,-41h,74h,21h,67h,-90h,73h,77h,-1h,-89h,-11h,61h,-22h,20h,'$' s2 ends

s3 segment

assume cs:s3,ds:s2,ss:s3 main proc far mov ax,s1 mov ss,ax lea sp,top mov ax,s2 mov ds,ax

mov bx,0 mov si,0

l: mov dx,array[si] cmp dx,0

jl addlow ;有符号数比较用jl add si,2 cmp si,40 jz exit jmp l

addlow: inc bx add si,2

cmp si,40 jz exit jmp l

exit: lea dx,h2 mov ah,9

int 21h

mov ax,bx call print

lea dx,crlf mov ah,9 int 21h lea dx,h1 mov ah,9 int 21h

mov ax,20

sub ax,bx call print jmp atend

print proc near

mov cl,10 mov si,0

repeat: div cl

mov dl,ah add dl,30h mov dh,0 push dx inc si mov ah,0

cmp al,0 jnz repeat

l2: pop dx mov ah,2 int 21h dec si cmp si,0 jnz l2

ret print endp

atend: mov ah,4ch int 21H

打印数字字符的子程序 ;

main endp s3 ends

end main

7.打印输出首地址为data的20个字数组中的最小偶数

s1 segment stack

dw 100h dup(?) top label word s1 ends

s2 segment

h1 db 'the min even number is: ','$'

crlf db 0dh,0ah,24h

data dw 50,-11,61,-22,72,-33,73,-41,74,21,67,-90,73,77,-1,-89,-11,61,-22,20,'$' s2 ends

s3 segment

assume cs:s3,ds:s2,ss:s1 main proc far

mov ax,s1 mov ss,ax lea sp,top mov ax,s2

mov ds,ax

mov bx,65534 ;bx存最小数，初始令最小值置为65534 mov si,0 mov cl,100

mov dl,2

l2: mov ax,data[si] cmp ax,0

jnl l4

neg ax ;如果是负数，则求补

l4: div cl

mov al,ah

mov ah,0 div dl cmp ah,0

jnz l1

cmp bx,data[si] ;比较最小值和数组中的每个数

jl l1 ;如果数组中的数大于最小值跳转到l1

mov bx,data[si] ;如果数组中的数小于最小值则将其赋给最小值 l1: add si,2

cmp si,40 jz exit

jmp l2

exit: lea dx,h1 mov ah,9 int 21h

cmp bx,0 jnl l5 neg bx

mov dl,'-' mov ah,2

int 21h

l5: mov ax,bx

call print jmp atend

print proc near

mov cl,10 mov si,0

repeat: div cl

mov dl,ah add dl,30h

mov dh,0 push dx inc si mov ah,0 cmp al,0 jnz repeat

l3: pop dx mov ah,2

调用子程序输出最小值 ;

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