Difference between revisions of "CSC231 Homework 5 2015"
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call _println | call _println | ||
| − | exit: | + | exit: mov eax, 1 |
| − | + | mov ebx, 0 | |
| − | + | int 0x80 | |
</source> | </source> | ||
Revision as of 16:11, 28 October 2015
--D. Thiebaut (talk) 15:31, 21 October 2015 (EDT)
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Problem #1
- Ssh to aurora.smith.edu using your 231a-xx account.
- Go into your account's public_html directory.
- Create a file with emacs, and call it javascriptTest.html.
- Store the following code into it:
<html> <body> <script type="text/javascript"> <!-- var a = 33; var b = 10; var c = "Test"; var i = 0; var linebreak = "<br />"; document.write("sum_i=0^100 = "); sum = 0; for ( i=0; i<=100; i++ ) { sum = sum + i; } document.write( sum ); document.write(linebreak); //--> </script> Example of Javascript arithmetic. <br /> </body> </html>
- Make the file readable:
chmod a+r javascriptTest
- In your favorite browser, go to this URL: http://cs.smith.edu/~231a-xx/testJavascript.html and replace xx by your 2-letter Id.
- You should see a page similar to the one shown below.
- Question
- How does Javascript score, in terms of speed of execution, when performing arithmetic, compared to Java and Python, as illustrated in the page on Nasm, Java, Python that we discussed in class?
- Submit your answers as a pdf file called hw5_1.pdf. Include supporting data in the file. Submit it as a pdf file in the HW 5 PB 1 section on Moodle.
Problem #2
This question is similar to Problem 1, but you have to measure the speed of java performing arithmetic with BigIntegers, as compared to performing arithmetic with ints.
- Question
- Is using BigIntegers slower, or faster than using ints, and how much faster or slower? Please include supporting evidence in your answer. Submit a pdf of your answer called hw5_2.pdf in the HW 5 PB 2 section on Moodle.
Problem #3
- Write a program called hw5_3.asm, and make sure it contains a function called _printHex() that will take the contents of eax in hexadecimal.
- Make your program use the 231Lib library.
- The main function of your program should be the following:
_start: mov eax, 0x12345678
call _printHex
call _println
mov eax, 0xABCDEF00
call _printHex
call _println
mov eax, 0x1234ABCD
call _printHex
call _println
exit: mov eax, 1
mov ebx, 0
int 0x80
