Assembly Program to Calculate the Factorial

title"to print the factorial of a given number"
.model small
.stack
.data
 val dw 4
 str db"the factorial is:$"
.code

prnt macro
 mov dl,ah
 mov dh,al
 mov ah,02h
 int 21h
 
 mov dl,dh
 mov ah,02h
 int 21h
endm
 
main proc
 mov ax,@data
 mov ds,ax
 
 mov dx,offset str
 mov ah,09h
 int 21h
 
 mov cx,val
 mov ax,1
top:
 mul cx
 loop top
 mov dx,0
 mov bx,100
 div bx

 aam
 add ax,3030h
 push dx
 prnt
 pop ax
 aam
 add ax,3030h
 prnt
 mov ah,4ch
 int 21h
 main endp
 end main