Question

Please write in Assembly Language! Thank you.

4 The Sheraton Hotel in Irvine is a 16 floor building. Suppose each bits of AX register represent one floor (the right most bit is representing the first floor). Ten people got into the elevator on the first floor and each pressed a random floor number between 2 and 16 (some random numbers may be the same which indicates more than one person will get off at the same floor). Write a program to (i) display the content of AX at base 2 (i) use AX register to determine at what floors the elevator will stop AX=1001 0001 0000 1100 Elevator will stop at floors no. 16 13 9 4 3

Answer 1

Code:

.data

msg1 DWORD "AX="

msg2 DWORD "Elevator will stop at floor no."

randomNum DWORD

.code

call Randomize ;Set the seed

mov ax, 0xffff ;sets the range of random number from 0 to ffff(1111 1111 1111 1111)

call RandomRange ; Generates a random number in ax

mov randomNum, ax; save the generated number in randomNum

// Print "Ax="

mov edx, OFFSET msg1

call WriteString

; Display register AX

mov ebx,TYPE 2

call WriteBinB ; if ebx is set to 2 then WriteBinB will output contents of eax as 16-bit binary format(for WORD ebx is set to 1)

// Print msg2 string

mov edx, OFFSET msg2

call WriteString

; Now check individual bits of the register AX. To check status of individual bits in each iteration AND registers bx and cx. Since only first bit of cx is set so if the first bit of bx is also set then AND will result into 1 otherwise 0.

mov edx,1; counter for floor numbers

mov bx,ax ; copy the random number genrated in bx

mov cx, 0x0001 ; 0000 0000 0000 0001

CHECK:

cmp edx,17

je END; If counter reaches 17 then end the loop

and cx, bx ; AND of cx and bx

jz ZERO; If this results in 0 then bit is not set, jump to ZERO

jmp ONE ; jump to ONE

ZERO:

shr bx ; Right shift bx to check next bit

inc edx ; increment the counter

jmp CHECK

ONE:

mov eax,edx

call WriteInt ; Display the floor number

inc edx

shr bx

jmp CHECK

END:

_exit