Lab#$5$: Logical, Bit Manipulation and String instructions

Assignment #$1$: Write an assembly code to find number of ones in each number in the array X and store

the result in the array Y

X DB $12$H$,0$OF$5$H$,0$OAHH

Y DB $3$ DUP$(0)$

Solution:

ORG $100$H

HLT

X DB $12$H$,0$F$5$H$,0$A$7$H

Y DB $3$ DUP$(0)$

Assignment #$2$: Write an assembly code to replace the even numbers in the array X with zero $($Note: without

using DIV or IDIV instructions$)$:

x DB $10,3,1,2$

Solution:

ORG $100$H

HLT

X DB $10,3,1,2$

Assignment #$3$: Write an assembly code to count number of a$\text{'}$s in the following string $($Note: using SCASB

instruction and REPNE prefix$)$:

STR DB 'aabcadxyaaAa'

Solution:

ORG $100$H

HLT

STR DB 'aabcadxyaaAa'

L EQU $$-$STR

Assembly Lab

Assignment #$4$: Write an assembly code to reverse the string STR$1$ in STR$2$