Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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assmbly language please. Proof of your solutions and test results: To show the operation of your
COPY A STRING IN REVERSE ORDER
Write a program with a loop and indirect addressing that copies a string from source to target, reversing the character order in the process. You MUST use the exact data block, memory allocation and initialization, as shown in the followings for testing - for showing that your code would not over-write the original data at the head(4 '$'s) middle(4 '%'s) and tail(4 '^'s):
BYTE 4 DUP('$')
source BYTE "This is the source string",0
BYTE 4 DUP('%')
target BYTE SIZEOF source DUP('#')
BYTE 4 DUP('^')
Hint: Should Not copy the null character, 0, at the end of the source string to the front of the target string. And, finish writing the target string by writing the null character, 0, to the last byte - replacing the last '#' there.
In the output of the program, both the source and target(reversed) strings should be shown, by calling the Irvine peripheral procedure(s). Use the following test code to display the Whole Data Bank:
mov edx, OFFSET source-4 ; display the 4 "$" and source string
call WriteString
mov edx, OFFSET target-4 ; display the 4 "%" and target string
call WriteString
mov edx, OFFSET target+SIZEOF target ; display the 4 "^"
call WriteString
IMPORTANT: for this exercise, NOT allowable to use any one of these directives: .IF, .ELSE, .ELSEIF, .WHILE, .REPEAT, etc
Transcribed Image Text:Programming Exercise 2 :-
COPY A STRING IN REVERSE ORDER
Write a program with a loop and indirect addressing that copies a string from source to target, reversing the character order in the process. You MUST use the
exact data block, memory allocation and initialization, as shown in the followings for testing - for showing that your code would not over-write the original
data at the head(4 '$'s) middle(4 '%'s) and tail(4 '^'s):
BYTE 4 DUP('$')
source BYTE "This is the source string",0
BYTE 4 DUP ('%')
SIZEOF
SIZEOF source DUP ('#')
source
target BYTE
BYTE 4 DUP('^')
Hint: Should Not copy the null character, O, at the end of the source string to the front of the target string. And, finish writing the target string by writing the
null character, O, to the last byte - replacing the last '#' there.
In the output of the program, both the source and target(reversed) strings should be shown, by calling the Irvine peripheral procedure(s). Use the following test
code to display the Whole Data Bank:
mov edx, OFFSET source-4
call WriteString
mov edx, OFFSET target-4
call WriteString
mov edx, OFFSET target+SIZEOF target ; display the 4 "^"
call WriteString
; display the 4 "$" and source string
; display the 4 "%" and target string
IMPORTANT: for this exercise, NOT allowable to use any one of these directives: .IF, .ELSE, .ELSEIF, .WHILE, .REPEAT, etc
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