MCSL 017 C and Assembly Language Programming 16-17

MCSL 017 

MCA 1st semester 

Section 2: Assembly Language Programming Lab

(b) Write a program in assembly language to find the factorial of any number (assume number is smaller than 10).

data segment

    msg db "THIS PROGRAM FOR FACTROIAL OF ANY NO$"

    MSG2 DB "FACTROIAL OF 6 IS = $"

    NO DD 6

    TMP DD 1

ends data

code segment

    assume cs:code,ds:data

    start:

    mov ax,data

    mov ds,ax

   

    lea dx,msg

    mov ah,09

    int 21h

    MOV dx,10

    mov ah,02

    int 21h

    MOV dx,13

    mov ah,02

    int 21h

   

    MOV AX,0

    MOV BX,0

    MOV CX,0

    MOV DX,0

    MOV AX,TMP

    MOV BX,AX

    L1:

    INC BX

    MUL BX            

    MOV TMP,AX

    cmp BX,NO

    JNE L1:

   

   

    MOV AX,0

    MOV BX,0

    MOV CX,0

    MOV DX,0

   

    MOV AX,TMP

    MOV BX,10

    L2:

    DIV BX

    PUSH DX

    MOV DX,0

    INC CX

    CMP AX,0

    JNE L2:

          

    lea dx,msg2

    mov ah,09

    int 21h

   

    L3:

    POP DX

    ADD DX,48

    MOV AH,02

    INT 21H

    LOOP L3

      

    

    MOV AH,4CH

    INT 21H

code ends

end start