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## 1. Take Input and Display Output
```asm
.model small
.stack 100h
.code
main proc
; Take input
mov ah, 01h
int 21h
mov bl, al
; New line
mov ah, 02h
mov dl, 0Dh
int 21h
mov ah, 02h
mov dl, 0Ah
int 21h
; Display output
mov ah, 02h
mov dl, bl
int 21h
; Exit
mov ah, 4Ch
int 21h
main endp
end main
```
---
# 2. Arithmetic Operations
## Addition
```asm
.model small
.stack 100h
.data
msg db 'Addition Result = $'
num1 db 05h
num2 db 03h
.code
main proc
mov ax, @data
mov ds, ax
; Print message
mov ah, 09h
lea dx, msg
int 21h
; Addition
mov al, num1
add al, num2
; Convert to ASCII
add al, 48
; Print result
mov dl, al
mov ah, 02h
int 21h
; Exit
mov ah, 4Ch
int 21h
main endp
end main
```
---
## Subtraction
```asm
.model small
.stack 100h
.data
msg db 'Subtraction Result = $'
num1 db 09h
num2 db 04h
.code
main proc
mov ax, @data
mov ds, ax
mov ah, 09h
lea dx, msg
int 21h
mov al, num1
sub al, num2
add al, 48
mov dl, al
mov ah, 02h
int 21h
mov ah, 4Ch
int 21h
main endp
end main
```
---
## Multiplication
```asm
.model small
.stack 100h
.data
msg db 'Multiplication Result = $'
num1 db 03h
num2 db 04h
.code
main proc
mov ax, @data
mov ds, ax
mov ah, 09h
lea dx, msg
int 21h
mov al, num1
mov bl, num2
mul bl
add al, 48
mov dl, al
mov ah, 02h
int 21h
mov ah, 4Ch
int 21h
main endp
end main
```
---
## Division
```asm
.model small
.stack 100h
.data
msg db 'Division Result = $'
num1 db 08h
num2 db 02h
.code
main proc
mov ax, @data
mov ds, ax
mov ah, 09h
lea dx, msg
int 21h
mov ax, 0000h
mov al, num1
mov bl, num2
div bl
add al, 48
mov dl, al
mov ah, 02h
int 21h
mov ah, 4Ch
int 21h
main endp
end main
```
---
# 3. Addition of N Numbers Using Loop
```asm
.model small
.stack 100h
.data
n dw 5
array dw 1,2,3,4,5
sum dw 0
.code
main proc
mov ax, @data
mov ds, ax
mov cx, n
lea si, array
xor ax, ax
start_loop:
add ax, [si]
add si, 2
loop start_loop
mov sum, ax
; Convert result
mov bx, 10
xor dx, dx
div bx
; Print tens
add al, 48
mov dl, al
mov ah, 02h
int 21h
; Print units
add dl, 0
add dl, dh
mov dl, dl
add dl, 48
mov dl, dl
mov ah, 02h
mov dl, dh
add dl, 48
int 21h
mov ah, 4Ch
int 21h
main endp
end main
```
---
# 4. Find Smallest and Largest Number Out of Two Numbers
```asm
.model small
.stack 100h
.data
msg1 db 'Enter First Number: $'
msg2 db 'Enter Second Number: $'
smallmsg db 0Dh,0Ah,'Smallest Number = $'
largemsg db 0Dh,0Ah,'Largest Number = $'
.code
main proc
mov ax, @data
mov ds, ax
; First input
mov ah, 09h
lea dx, msg1
int 21h
mov ah, 01h
int 21h
mov bl, al
; New line
mov ah, 02h
mov dl, 0Dh
int 21h
mov dl, 0Ah
int 21h
; Second input
mov ah, 09h
lea dx, msg2
int 21h
mov ah, 01h
int 21h
mov cl, al
cmp bl, cl
jg first_large
; Second is large
mov ah, 09h
lea dx, smallmsg
int 21h
mov dl, bl
mov ah, 02h
int 21h
mov ah, 09h
lea dx, largemsg
int 21h
mov dl, cl
mov ah, 02h
int 21h
jmp exit
first_large:
mov ah, 09h
lea dx, smallmsg
int 21h
mov dl, cl
mov ah, 02h
int 21h
mov ah, 09h
lea dx, largemsg
int 21h
mov dl, bl
mov ah, 02h
int 21h
exit:
mov ah, 4Ch
int 21h
main endp
end main
```
---
# 5. Find the Smallest Number Out of Three Numbers
```asm
.model small
.stack 100h
.data
msg1 db 'Enter A: $'
msg2 db 'Enter B: $'
msg3 db 'Enter C: $'
small db 0Dh,0Ah,'Smallest Number = $'
.code
main proc
mov ax, @data
mov ds, ax
; Input A
mov ah, 09h
lea dx, msg1
int 21h
mov ah, 01h
int 21h
mov bl, al
; New line
mov ah, 02h
mov dl, 0Dh
int 21h
mov dl, 0Ah
int 21h
; Input B
mov ah, 09h
lea dx, msg2
int 21h
mov ah, 01h
int 21h
mov cl, al
; New line
mov ah, 02h
mov dl, 0Dh
int 21h
mov dl, 0Ah
int 21h
; Input C
mov ah, 09h
lea dx, msg3
int 21h
mov ah, 01h
int 21h
mov bh, al
; Compare
mov al, bl
cmp al, cl
jle checkA
mov al, cl
cmp al, bh
jle showB
jmp showC
checkA:
cmp al, bh
jle showA
jmp showC
showA:
mov ah, 09h
lea dx, small
int 21h
mov dl, bl
mov ah, 02h
int 21h
jmp exit
showB:
mov ah, 09h
lea dx, small
int 21h
mov dl, cl
mov ah, 02h
int 21h
jmp exit
showC:
mov ah, 09h
lea dx, small
int 21h
mov dl, bh
mov ah, 02h
int 21h
exit:
mov ah, 4Ch
int 21h
main endp
end main
```
---
# 6. Conversion of Small Letter to Big Letter and Vice Versa
```asm
.model small
.stack 100h
.data
msg1 db 'Enter a Character: $'
msg2 db 0Dh,0Ah,'Converted Character: $'
.code
main proc
mov ax, @data
mov ds, ax
; Print message
mov ah, 09h
lea dx, msg1
int 21h
; Input character
mov ah, 01h
int 21h
mov bl, al
; Check uppercase
cmp bl, 'A'
jl lower_check
cmp bl, 'Z'
jg lower_check
; Convert to lowercase
add bl, 32
jmp output
lower_check:
cmp bl, 'a'
jl output
cmp bl, 'z'
jg output
; Convert to uppercase
sub bl, 32
output:
mov ah, 09h
lea dx, msg2
int 21h
mov dl, bl
mov ah, 02h
int 21h
mov ah, 4Ch
int 21h
main endp
end main
```
---
# 7. Pattern Printing Using Loop
## Triangle Pattern
Output:
```
*
**
***
****
*****
```
Code:
```asm
.model small
.stack 100h
.code
main proc
mov cx, 5
mov bx, 1
outer_loop:
mov dx, bx
inner_loop:
mov ah, 02h
mov dl, '*'
int 21h
dec dx
jnz inner_loop
; New line
mov ah, 02h
mov dl, 0Dh
int 21h
mov dl, 0Ah
int 21h
inc bx
loop outer_loop
mov ah, 4Ch
int 21h
main endp
end main
```