Exercises

Q$1)$ Write an assembler code to reverse string $x$ in order; use LODSB and STOSB strings; where $x$ DB HELLO WORLD'

x DB 'HELLO WORLD'

y DB $11$Duo$(?)$

Q$2)$ Write an assembler codes to scan string $x$ for $*$ character ; replacing it by space.

X $DB\text{'}AB{C}^{**}+GFDK****KLM\text{'}$

Q$3)$ write an assembler codes to find factorial of values in $x$ memory locations; storing the result into $Y$ memory locations; call a procedure to find factorial of numbers in $x$; where :

Q$4)$ Write a sequence of instructions using $($LODSB and STOSB $)$ that copy each alphabet from $x$ string to $Y$ string, converting it to lowercase. Note: setting bit $5$ in an uppercase character will convert it to lowercase

The value of $Y$ after executing the following code is:

$xDB4$

Y DB$?$

MOV CX$,2$

L: CALL SUM

LOOP L

MOV Y$,$ AL

HLT

SUM PROC

MOV AH$,$ X

ADD AL$,$ AH

RET

SUM ENDP

$Y=$

What is the value of $Cx$ after execution the following codes?

STR DB "ABCDE"

MOV DI$,$ OFFSET STR

MOV CX$,5$