Eliminating the last one from binary number

Provided the Number is not zero Then

// representing number in some format  
//A contains the bits before the last one & B is after last one
//small c after variable represent Compliments of that number like N & Nc
Num=A1B
//Some Property -N=Nc+1  Nc is compliment of N
(-Num) =(A1B)c+1=Ac0Bc+1=Ac1B //{ 0Bc since Bc is all bit 1 adding 1 will give 1B}

Num= A1B
-Num=Ac1B
//if we Ac&A will be zero and B&B will be zero too.. so , so remaining will be the last one
(Num&(-Num))   //leave last single '1' 

Try this on you PC..

Python in 5 minute

Python, an interpreted, interactive, object-oriented, extensible programming language
with automatic memory tracking well use of python is "Google" every application.. expecting new programming language Go will be something like Python with other good features of other programming language

now let's talk about programming part..

for writing executing and writing program
you can download interpreter from Download
or net beans plugin for python from: Download
you don't have to declare what your object type is but yes before using it you have to give reference to object type if necessary

eg..
list/array you can declare in this way.:

a=[]
#map you can declare in this way.:
a={}
#set you can declare in this way
a=set()
#change in python and other programming language:

&& = and
true = True
false = False
|| = or
if() = "if():"
else if = "elif():"
while() = "while():"
foreach () =  for():
// = #
/* --- */ = """ ------- """   
#above can be use as multiline string also

Python uses whitespace indentation, rather than curly braces or keywords, to delimit blocks #eg:

a=2
if( a>0):
   print "HELLO WORLD"
   print "You are in If Loop"
print "You are now running normal"

out/put;
Hello World
you are in if loop
you are now running normal
Assigning variable in one line

a,b=0,1

will assign a=0 and b=1

#one funny program :

a,b=0,1
while b<1000:
    print b
   a,b=b,a+b

Guess the o/p of this program
it will print the Fibonacci series..

#checking presence of key,data ,in list or map
if a in b:
  do something
#########################################
#writing a function 
def  function_name(variable1,variable2...)
       return some variable

continue and break are same as other language
#traversing list

#creating a new list from original list
a=['my' 'name' 'is','rajesh','patidar']
a[:]  # this is will create a copy of a
a[2:4] # will create a new list form index 2 to index 3
a[2:] # will create a new list from index 2  to up to last
a[:2] #will create a list from starting up to index 1
a[:-2] # will create a new list leaving last two item of list
a[::-1] # reverse the list

############################################
Module in Python
it is same as header file in c++ and package in java
but it track module through file name

//hello.py
def sayHello(name):
       print "You are welcome MR: "+name

#myprg.py
import hello
sayHello("Rajesh Patidar")