Task #1
Introduction to Stack
//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC
mov ax, @data
mov ds, ax
mov ax, 1234h
mov bx, 5678h
push ax
inc ax
push ax
push bx
pop cx
pop dx
pop cx
pushf
sub ax,ax
popf
ENDP MAIN
end MAIN
Task #2
Write a code to take an input string and print the string in reverse.
//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC
mov ax, @data
mov ds, ax
mov ah, 2
mov dl, '?'
int 21h
mov ah, 1
mov cx, 0
label1:
int 21h
cmp al, 0dh
je label2
push ax
inc cx
jmp label1
label2:
mov ah, 2
mov dl, 0ah
int 21h
mov dl, 0dh
int 21h
label3:
pop dx
int 21h
loop label3
mov ah, 4ch
int 21h
ENDP MAIN
end MAIN
Task #3
Introduction to procedure
//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC
mov ax, @data
mov ds, ax
mov ax, 1595
mov bx, 2526
call a
mov ah, 4ch
int 21h
ENDP MAIN
a PROC
add ax, bx
ret
endp a
end MAIN
Task #4
Write a code with a multiply procedure.
//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC
mov ax, @data
mov ds, ax
mov ax, 2
mov bx, 3
call multiply
mov ah, 4ch
int 21h
ENDP MAIN
multiply PROC
push ax
push bx
xor dx, dx
repeat:
test bx, 1
jz endif
add dx, ax
endif:
shl ax, 1
shr bx, 1
jnz repeat
pop bx
pop ax
ret
endp multiply
end MAIN
Task #5
Multiplication procedure by addition
//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC
mov ax, @data
mov ds, ax
mov ax, 2
mov bx, 30
call multiply
mov ah, 4ch
int 21h
ENDP MAIN
multiply PROC
push ax
push bx
push cx
mov cx, bx
xor dx, dx
top:
add dx, ax
loop top
pop cx
pop bx
pop ax
ret
endp multiply
end MAIN
Task #6
Multiply and division instruction
//Code
.MODEL SMALL
.STACK 100h
.DATA
.CODE
MAIN PROC
mov ax, @data
mov ds, ax
mov ax, 2
mov bx, 0FFFFh
mul bx
imul bx
div bx
idiv bx
mov ah, 4ch
int 21h
ENDP MAIN
end MAIN
Task #7
Write a program that prompts user to enter 2 binary numbers upto 8 digits each, and print their sum in the next line in binary. If the user enters illegal character, the user should be prompted to begin again. Each input ends withj a carriage return.
Sample execution: Type a binary number, upto 8 digits: 11001010 Type a binary number, upto 8 digits: 10011100 The binary sum is 101100110
//Code To be done by students
Homework
- Chapter 7 Problem 9
- Chapter 7 Problem 10
- Chapter 7 Problem 11
- Chapter 7 Problem 13
- Chapter 7 Problem 14