Computer Organization and Architecture
SCR 1043
Semester 2, 07/08
Programming 6: Interactive Programming
Sample Program
Write a complete assembly language to have input and output as below:
Please input first numbers: 23,
Please input second numbers: 1
Please input third numbers: 87
Please input fourth numbers: 0
The smallest number is: 0
The largest number is: 87
The summation of the numbers is: 23 + 1 + 87 + 0 = 111
Instruction:
;Programming 6
;
INCLUDE Irvine32.inc
;
;data segment
.data
str1
BYTE
" Please input first numbers: ",0
str2
BYTE
" Please input second numbers: ",0
str3
BYTE
" Please input third numbers: ",0
str4
BYTE
" Please input fourth numbers: ",0
str5
BYTE
" The smallest number is: ",0
str6
BYTE
" The largest number is: ",0
str7
BYTE
" The summation of the numbers is: ",0
str8
BYTE
" + ",0
str9
BYTE
" = ",0
number
dword 4 dup (?)
smallest dword ?
largest dword ?
sum
dword ?
.code
main
;
PROC
int 3
; get input data from keyboard
;
mov
esi, OFFSET number
; get first number
mov
edx, OFFSET str1
call
WriteString
call
ReadDec
mov
[esi], eax
1
call
Crlf
; get second number
add
esi, 4
mov
edx, OFFSET str2
call
WriteString
call
ReadDec
mov
[esi], eax
call
Crlf
; get third number
add
esi, 4
mov
edx, OFFSET str3
call
WriteString
call
ReadDec
mov
[esi], eax
call
Crlf
; get forth number
add
esi, 4
mov
edx, OFFSET str4
call
WriteString
call
ReadDec
mov
[esi], eax
call
Crlf
; to find the smallest
;
mov
esi, OFFSET number
mov
ax, [esi]
mov
ecx, 3
next1:
add
esi, 4
cmp
ax, [esi]
jle
next2
mov
ax, [esi]
next2:
loop
next1
mov
smallest, eax
; to find the largest number
;
mov
esi, OFFSET number
mov
ax, [esi]
mov
ecx, 3
next4:
add
esi, 4
cmp
eax, [esi]
jge
next3
mov
ax, [esi]
next3:
loop
next4
mov
largest, eax
;
; to find the summation of the numbers
;
mov
esi, OFFSET number
mov
ax, [esi]
mov
ecx, 3
2
next5:
add
add
loop
mov
esi, 4
ax, [esi]
next5
sum, eax
; to display the answers
;
mov
edx, OFFSET str5
call
WriteString
mov
eax, smallest
call
WriteDec
call
Crlf
mov
call
mov
call
call
edx, OFFSET str6
WriteString
eax, largest
WriteDec
Crlf
mov
call
edx, OFFSET str7
WriteString
mov
mov
mov
call
esi, OFFSET number
ecx, 3
eax, [esi]
WriteDec
mov
call
add
mov
call
edx, OFFSET str8
WriteString
esi, 4
eax, [esi]
WriteDec
loop
next6
mov
call
mov
call
call
edx, OFFSET str9
WriteString
eax, sum
WriteDec
Crlf
next6:
exit
main
ENDP
END
main
Exercise:
1.
Type the given sample program below and execute it. Input the required
data and inspect the output of the program. Trace the program and
identify the method used to produce the required output.
2.
Change the program above so that user can also input signed numbers.
3.
Change the program above so that user can input hexadecimal numbers.
3
4.
Change the program by implementing each function in a procedure.
There should be 4 procedures:
PROC GetNumbers
PROC Cal Small
PROC Cal Large
PROC Cal Sum
PROC DisplayAnswers
How to use procedure:
a.
b.
To branch to a procedure: CALL (procedure_name)
To write a procedure :
(procedure_name) PROC
:
(operations)
:
RET
(procedure_name) ENDP
4