hey there!...... for those learning about how negative numbers are computed in your computer am sure you have
heard of one's,two's complement......https://www.cs.cornell.edu/~tomf/notes/cps104/twoscomp.html
So i did a little python script to do all this conversions.Please Note i know some of this stuff can be done through |,&,^ operators not to mention python built in functions i just did this to show how the inner workings of the conversions can be done as per me 
Before taking a look check out http://artsites.ucsc.edu/ems/music/equipment/computers/bits_bytes/bits_bytes.html


#try 1-127......(-ve)
#e.g.-13,-16,-17,-5 etc
print"-----------------------------------------------------"
print"Change from binary to one's and two's complement"
print"-----------------------------------------------------"
print"-----------------------------------------------------"
try:
result=[]
numb=input("Enter number:")
numb=abs(numb) #convert to positive number
except:
print("Digits only!")
else:
#get binary form you can use bin()....no biggy!
while numb!=0:
if numb%2==0:
result.append(0)
numb=numb//2
else:
result.append(1)
numb=numb//2
result.reverse() # get reversed form
sizeL=len(result)

#change to hex
if sizeL!=4:
size=8-sizeL
else:
size=4
for i in range(size):
result.insert(i,0)
print "(+)Binary form:",str(result).strip("]").strip("[").replace(",","")
#convert to one's complement
for i in range(8):
if result[i]==1:
result.pop(i)
result.insert(i,0)
else:
result.pop(i)
result.insert(i,1)
print "(+)One's complement:",str(result).strip("]").strip("[").replace(",","")
#convert to two's complement
twoC=range(8)
twoC.reverse()
for i in twoC:
if int(result[i])==1:
result.pop(i)
result.insert(i,0)
else:
result.pop(i)
result.insert(i,1)
break;
print "(+)Two's complement:",str(result).strip("]").strip("[").replace(",","")
print"-----------------------------------------------------"
print"\t\t\tEND"
print"-----------------------------------------------------"



Don't be dumb to try -257  try 1 to any 8bits form! .....but can be modified to have more bits.......
The largest number you can represent with 8 bits is 11111111, or 255 in decimal notation,00000000 is the smallest. You can only represent 256 things with a byte.

We had a challenge on that: https://evilzone.org/weekly-challenge/challenge-17-sieve-of-eratosthenes/

Damn! did see that thread..... nicely  done in c/c++ i guess i don't need to do it again!

I see....so basically they are hoping people will transition from python2 to python3.But if you think about it its kinda silly to have two versions of the same thing....Instead they could have just made the changes to python2 and move on....anyway i love python so i guess learning both ain't bad

thnx guys 4 the advice

I got python C extension covered but i seem not to find a good tutorial on Java C extensions.I can any one point to me where i can find a good tutorial on java C extending.

nah you need to start a program from terminal eg firefox the get its pid......using the pid write the EIP reg to execute the shell

actually i notice once you get the vul tables you just put
www.example.com/index.php?id=null UNION SELECT 1,table_NAME,3,4,5,6,7,8,9,10 from information_schema.tables-- and it worked fine