cs401 assignment no 2 solution 2020.

CS401 ASSIGNMENT NO 2 IDEA SOLUTION

Computer Architecture and Assembly Language Programming (CS401)                                          Assignment # 02       Due date 12-06-2020

Please carefully read the following instructions before attempting assignment. RULES FOR MARKING It should be clear that your assignment would not get any credit if: The assignment is submitted after the due date. The submitted assignment does not open or file is corrupt. Strict action will be taken if submitted solution is copied from any other student or from the internet. You should concern the recommended books to clarify your concepts as handouts are not sufficient. You are supposed to submit your assignment in .doc or docx format. Any other formats like scan images, PDF, zip, rar, ppt and bmp etc. will not be accepted. Topic Covered: ·         Addressing Modes ·         Branching ·         Subroutines

NOTE No assignment will be accepted after the due date via email in any case (whether it is the case of load shedding or internet malfunctioning etc.). Hence refrain from uploading assignment in the last hour of deadline. It is recommended to upload solution file at least two days before its closing date. If you people find any mistake or confusion in assignment (Question statement), please consult with your instructor before the deadline. After the deadline no queries will be entertained in this regard. For any query, feel free to email at: cs401@vu.edu.pk

Q1. Write a subroutine that will take two arrays Array1 & Array2. Array1 will contain uppercase alphabets from A-M and the Array2 will contain lower case alphabets from n-z. Your subroutine should work in such a way that it will convert array1 elements to lower case and array2 elements to uppercase and populate them in a 3^rd array.

                                                                                                                                                                (Marks 20)

For example:

Array1 = A,B,C,D,E,F,G,H,I,J,K,L,M

Array2= n,o,p,q,r,s,t,u,v,w,x,y,z  

Output should be:

Array3= a,b,c,d,e,f,g,h,I,j,k,l,m,N,O,P,Q,R,S,T,U,V,W,X,Y,Z

Note: You can consult to alphabet’s ASCII values through this link: https://vulms.vu.edu.pk/Courses/CS401/Downloads/ASCII%20codes.doc

“The End”

SOLUTION.

[org 0x0100] ;offset

jmp start    ; jump to start label

Array1: db 'A','B', 'C' ,'D', 'E', 'F' ,'G' ,'H' ,'I' ,'J' ,'K','L','M'

Array2: db  'n' ,'o' ,'p' ,'q' ,'r' ,'s', 't' ,'u', 'v', 'w'  ,'x' ,'y' ,'z'

Array3: db   '', '', '', '' ,'' ,'','','','','','','','','','','','','','','','','','','','','' 

start:

mov bx, 0

mov cx, 13

lower_case:

mov al, [Array1+bx]

mov dl ,al

add dl, 32

mov [Array3+bx],dl

add bx,1

loop lower_case

mov bx,0

mov cx,13

upper_case:

mov al, [Array2+bx]

mov dl ,al

sub dl , 32

mov [Array3+bx+13], dl

add bx,1

loop upper_case

mov bx,0

mov cx,26

print_result:

mov al,[Array3+bx]

mov dl ,al

mov ah ,02

int 21h

add bx,1

loop print_result

exit:

int 0x10

mov ax,0x4c00

int0x21    

 SAMPLE CODE WITH OUTPUT.

ASSINGMENT NO 2 CS401

 SOLUTION

STUDENT NAME = EHTISHAM

STUDENT ID        =MC180200301

; Name: EHTISHAM

; STD ID: MC180200301

[org 0x0100]

jmp start

msg: db'E'

wait_for_key:

mov ah,0

int 16h

cmp ah,12h

jne wait_for_key

mov ah,0x13

mov al,1

mov bh,0

mov bl,7

mov dx,0x0000

mov cx,01

push cs

pop es

mov bp,msg

int 0x10

mov ax,0x4c00

int 0x21

start:

jmp wait_for_key

OUTPUT

AFTER PRESSING CLS AND HIT ENTER SCREEN WILL BE CLEAR

PRESS E First alphabet of your name