need help here...

[zhinokin]

i have a problem with this code...will you please help me with this...the program goes that it will input the base then its power ..

for example:

base: 2
power: 3
result : 8

the base is multiply itself 3 times...
the problem with this one is that it goes to infinite looping in the multiply function ..i know that i'm using the right code but why is it doesn't get its perfect answer..

call clear_screen
    call start
    int 20h


clear_screen:
       mov ax,03h
       int 10h
       ret


start:


    lea dx, msga
    mov ah, 9
    int 21h  
     
    mov ah,1
    int 21h
    
    sub al,30h
    push ax	    
    
    lea dx, msgb
    mov ah, 9
    int 21h	 
  
    mov ah,1
    int 21h 
    
    sub al,30h
    push ax  
    
  
	   
    lea dx, msgd
    mov ah, 9
    int 21h
    
    pop bx
    pop ax
    
    
multiply:
    mov cx,0 
    mov ah,0
    mov bh,0
    mul bx    

    inc cx
    cmp cx,bx
    jne multiply
    
     call print_ax

      jmp exit    
	

print_ax:

    cmp ax, 0
    jne print_ax_r
    push ax
    mov al, '0'
    mov ah, 0eh
    int 10h
    pop ax
    ret 
    
print_ax_r:
    pusha
    mov dx, 0
    cmp ax, 0
    je pn_done
    mov bx, 10
    div bx    
    call print_ax_r
    mov ax, dx
    add al, 30h
    mov ah, 0eh
    int 10h    
    jmp pn_done
    
pn_done:
    popa  
    ret  
    
exit:  mov ax, 4c00h 
    int 21h
	


    msga db "Enter base [1-9]: $"
    msgb db 13,10,"Enter power [1-9]: $"
    msgd db 13,10,"Result: $"