In the previous article, we have discussed Python Program for Swapping Three Variables Without Using any Temporary Variable.
The task is to toggle the first bit and last bit of a given number in python.
Toggling:
A toggling operation changes the value of a bit from 0 to 1 and from 1 to 0.
Examples:
Example1:
Input:
Given Number =12
Output:
The Number after toggling the first bit and last bit of a given number{ 12 } = 5
Example2:
Input:
Given Number =4
Output:
The Number after toggling the first bit and last bit of a given number{ 4 } = 1
- Python Program to Swap all Odd and Even Bits of a Number
- Python Program to Check whether kth Bit is Set or not
- Python Program to Find Position of Rightmost Set Bit
Program to Toggle First and Last Bits of a Number in Python
Below are the ways to toggle the first bit and last bit of a given number in python:
Method #1: Using Right Shift (>>)Operator (Static Input)
Approach:
- Give the number as static input and store it in a variable.
- Pass the given number as an argument to the takeLastandFirstsetbits function.
- Create a function to say takeLastandFirstsetbits which takes the given number as an argument.
- Apply the or(|) operator to the given number and given_numb >> 1(Right Shift) and store it in the same variable.
- Apply the or(|) operator to the given number and given_numb >> 2(Right Shift) and store it in the same variable.
- Apply the or(|) operator to the given number and given_numb >> 4(Right Shift) and store it in the same variable.
- Apply the or(|) operator to the given number and given_numb >> 8(Right Shift) and store it in the same variable.
- Apply the or(|) operator to the given number and given_numb >> 16(Right Shift) and store it in the same variable.
- Add 1 to the given number and right shift the result by 1 and store it in another variable.
- Return the above result +1.
- Pass the given number as an argument to the toggleFirstandLastbits function.
- Create a function to say toggleFirstandLastbits which takes the given number as an argument and returns the number after toggling the first and last bits of a given number.
- Check if the given number is equal to 1 using the if conditional statement.
- If the statement is true, then return 0.
- Return the Xor result of the given number and takeLastandFirstsetbits(gven_numb).
- Print the number after toggling the first bit and last bit of a given number.
- The Exit of the Program.
Below is the implementation:
# Create a function to say takeLastandFirstsetbits which takes the given number as an
# argument.
def takeLastandFirstsetbits(gven_numb):
# Apply the or(|) operator to the given number and given_numb >> 1(Right Shift) and
# store it in the same variable.
gven_numb = gven_numb | gven_numb >> 1
# Apply the or(|) operator to the given number and given_numb >> 2(Right Shift) and
# store it in the same variable.
gven_numb = gven_numb | gven_numb >> 2
# Apply the or(|) operator to the given number and given_numb >> 4(Right Shift) and
# store it in the same variable.
gven_numb = gven_numb | gven_numb >> 4
# Apply the or(|) operator to the given number and given_numb >> 8(Right Shift) and
# store it in the same variable.
gven_numb = gven_numb | gven_numb >> 8
# Apply the or(|) operator to the given number and given_numb >> 16(Right Shift) and
# store it in the same variable.
gven_numb = gven_numb | gven_numb >> 16
# Add 1 to the given number and right shift the result by 1 and store it in another
# variable.
p = (gven_numb + 1) >> 1
# Return the above result +1.
return (p + 1)
# Create a function to say toggleFirstandLastbits which takes the given number as an
# argument and returns the number after toggling the first and last bits of a given number.
def toggleFirstandLastbits(gven_numb):
# Check if the given number is equal to 1 using the if conditional statement.
if (gven_numb == 1):
# If the statement is true, then return 0.
return 0
# Return the Xor result of the given number and takeLastandFirstsetbits(gven_numb).
return gven_numb ^ takeLastandFirstsetbits(gven_numb)
# Give the number as static input and store it in a variable.
# Pass the given number as an argument to the takeLastandFirstsetbits function.
# Pass the given number as an argument to the toggleFirstandLastbits function.
gven_numb = 12
# Print the number after toggling the first bit and last bit of a given number.
print("The Number after toggling the first bit and last bit of a given number{", gven_numb, "} = ", toggleFirstandLastbits(
gven_numb))
Output:
The Number after toggling the first bit and last bit of a given number{ 12 } = 5
Method #2: Using Right Shift (>>)Operator (User Input)
Approach:
- Give the number as user input using the int(input()) function and store it in a variable.
- Pass the given number as an argument to the takeLastandFirstsetbits function.
- Create a function to say takeLastandFirstsetbits which takes the given number as an argument.
- Apply the or(|) operator to the given number and given_numb >> 1(Right Shift) and store it in the same variable.
- Apply the or(|) operator to the given number and given_numb >> 2(Right Shift) and store it in the same variable.
- Apply the or(|) operator to the given number and given_numb >> 4(Right Shift) and store it in the same variable.
- Apply the or(|) operator to the given number and given_numb >> 8(Right Shift) and store it in the same variable.
- Apply the or(|) operator to the given number and given_numb >> 16(Right Shift) and store it in the same variable.
- Add 1 to the given number and right shift the result by 1 and store it in another variable.
- Return the above result +1.
- Pass the given number as an argument to the toggleFirstandLastbits function.
- Create a function to say toggleFirstandLastbits which takes the given number as an argument and returns the number after toggling the first and last bits of a given number.
- Check if the given number is equal to 1 using the if conditional statement.
- If the statement is true, then return 0.
- Return the Xor result of the given number and takeLastandFirstsetbits(gven_numb).
- Print the number after toggling the first bit and last bit of a given number.
- The Exit of the Program.
Below is the implementation:
# Create a function to say takeLastandFirstsetbits which takes the given number as an
# argument.
def takeLastandFirstsetbits(gven_numb):
# Apply the or(|) operator to the given number and given_numb >> 1(Right Shift) and
# store it in the same variable.
gven_numb = gven_numb | gven_numb >> 1
# Apply the or(|) operator to the given number and given_numb >> 2(Right Shift) and
# store it in the same variable.
gven_numb = gven_numb | gven_numb >> 2
# Apply the or(|) operator to the given number and given_numb >> 4(Right Shift) and
# store it in the same variable.
gven_numb = gven_numb | gven_numb >> 4
# Apply the or(|) operator to the given number and given_numb >> 8(Right Shift) and
# store it in the same variable.
gven_numb = gven_numb | gven_numb >> 8
# Apply the or(|) operator to the given number and given_numb >> 16(Right Shift) and
# store it in the same variable.
gven_numb = gven_numb | gven_numb >> 16
# Add 1 to the given number and right shift the result by 1 and store it in another
# variable.
p = (gven_numb + 1) >> 1
# Return the above result +1.
return (p + 1)
# Create a function to say toggleFirstandLastbits which takes the given number as an
# argument and returns the number after toggling the first and last bits of a given number.
def toggleFirstandLastbits(gven_numb):
# Check if the given number is equal to 1 using the if conditional statement.
if (gven_numb == 1):
# If the statement is true, then return 0.
return 0
# Return the Xor result of the given number and takeLastandFirstsetbits(gven_numb).
return gven_numb ^ takeLastandFirstsetbits(gven_numb)
# Give the number as user input using the int(input()) function and store it in a variable.
gven_numb = int(input("Enter some random number = "))
# Pass the given number as an argument to the takeLastandFirstsetbits function.
# Pass the given number as an argument to the toggleFirstandLastbits function.
# Print the number after toggling the first bit and last bit of a given number.
print("The Number after toggling the first bit and last bit of a given number{", gven_numb, "} = ", toggleFirstandLastbits(
gven_numb))
Output:
Enter some random number = 4
The Number after toggling the first bit and last bit of a given number{ 4 } = 1
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