用汇编语言编写：从键盘输入一个正的奇数，按照值打印出菱形图案，如输入7，则输出如下图案（需有输入错误提示和重新输入的提示） * *** ***** ******* ***** *** *

.model small
.stack 100h
.data
    msg1 db 0dh,0ah,'Please input an odd number: $'
    msg2 db 0dh,0ah,'Invalid input, please input an odd number: $'
    msg3 db 0dh,0ah,'Press any key to continue...$'
    num db ?
.code
main proc
    mov ax, @data
    mov ds, ax

    call get_num
    call print_diamond

    mov ah, 4ch
    int 21h
main endp

get_num proc
    mov ah, 9
    lea dx, msg1
    int 21h

    mov ah, 1
    int 21h
    sub al, 30h
    cmp al, 0
    jle input_error
    cmp al, 9
    jg input_error
    cmp al, 1
    je input_error
    and al, 1
    jz input_error

    mov num, al
    ret

input_error:
    lea dx, msg2
    mov ah, 9
    int 21h
    call get_num
    ret
get_num endp

print_diamond proc
    mov cx, num
    mov bx, 1
    mov dx, 0

    print_top:
        call print_space
        call print_star
        inc bx
        cmp bx, cx
        jle print_top

    mov bx, cx
    mov dx, 1

    print_bottom:
        call print_space
        call print_star
        dec bx
        cmp bx, 1
        jge print_bottom

    ret

print_space proc
    push cx
    mov cx, dx
    shr cx, 1

    space_loop:
        mov ah, 2
        mov dl, ' '
        int 21h
        loop space_loop

    pop cx
    dec dx
    ret
print_space endp

print_star proc
    push cx
    mov cx, bx

    star_loop:
        mov ah, 2
        mov dl, '*'
        int 21h
        loop star_loop

    pop cx
    add dx, 2
    ret
print_star endp

end main