X86 Assembly language lab:

TITLE Lab 3: assembly language fundamentals

;;;;; Q1: Don't forget to document your program ; Name:Yuyan Wang

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;; ;;;;; Answer each question below by writing code at the APPROPRIATE places in the file. ;;;;; Hint: the appropriate place is not always right below the question.

;;;;; Q2: Write the directive to bring in the IO library

;;;;; Q3: Create a constant called MAX and initialize it to 150

;;;;; Q4: Create a constant called MIN and intialize it to 15% of MAX (from Q3) ;;;;; in an integer expression constant

;;;;; Q5: Define an array of 20 signed doublewords, use any array name you like. ;;;;; Initialize: ;;;;; - the 1st element to -250 ;;;;; - the 2nd element to the hexadecimal value A924 ;;;;; - the 3rd element to the binary value 10100 ;;;;; - the 4th element to MAX (from Q3). Use MAX, not a number. ;;;;; and leave the rest of the array uninitialized.

;;;;; Q6. Define the string "Output = ", use any variable name you like.

;;;;; Q7. Define a prompt that asks the user for a number.

;;;;; Q8. Write code to store the value of MIN into eax, then print the value ;;;;; to screen. ;;;;; Use the string you defined in Q6 as the text explanation for your output.

;;;;; Q9. Write code to prompt the user for a number, using the prompt string that ;;;;; you defined in Q7.

;;;;; Q10. Write code to read in the user input, which you can assume is always ;;;;; a positive number. Hint: use the correct library routine for positive number.

;;;;; Q11. Write code to print "Output = " and then echo to screen the user input.

;;;;; Q12. Write code to print "Output = " and then print the first element of the ;;;;; array defined in Q5.

;;;;; Q13. Build, run, and debug your code.

;;;;; Your output should be similar to this (without the commented explanation): ;;;;; Output is 22 ; printing MIN ;;;;; Enter a positive number: 7 ; prompt the user for a number ;;;;; Output is 7 ; echo user input ;;;;; Output is -250 ; print first element of array ;;;;; Press any key to continue . . .

;;;;; Q14. At the end of the source file, without using semicolons (;), add a comment block ;;;;; to show how bigData appears in memory (should be the same 8 hexadecimal values ;;;;; that you saw in assignment 2), ;;;;; and explain why it looks different than the actual value.

;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

.data bigData QWORD 0abcdef0123456789h ; same bigData value as last lab

.code main PROC

exit main ENDP

END main