In this simple python program, we need to compute the count of the set bits in an integer. It is a number-based python program.

For a better understanding of this example, we always recommend you to learn the basic topics of Python programming listed below:

This simple python program is for counting the number of set bits in an integer. In the binary representation of an integer, we use two bits which are 1 and 0, where the 1 is called the set bit. So we have to count the number of set bits in an integer. Let us take an example of number 9; its binary representation is 1001; let us count how many set bits in that number, that is 2.

To apply this logic in python programming, we accept the number from the user, and we are calling a user-defined function to count the number of set bits in that number. Inside that function, we initialize a **count **variable to **zero**. Then we open a `while loop`

till the number. Inside that loop, we are using bitwise **and **operator with n and n-1. When we do bitwise and operation between n and n-1, it will remove the last one bit. So we are using the **count **variable to check how many times we are doing this bitwise **and **operation to make the number **n** to zero. That will be the number of set bits stored in the **count**, as we increment **count **in every iteration.

**STEP 1:** Accept an integer from the user using the input function in the python programming language.

**STEP 2:** Call the function for counting the number of bits in the number. And print that return value from the function using `print`

in python language.

**STEP 1:** Pass the number to the function as a parameter from the calling function.

**STEP 2:** Initialize the count variable to zero, which is for counting the set bits.

**STEP 3:** Open a `while loop`

until the number is zero.

**STEP 4:** Using bitwise **and **operator between the number **n** and **n-1** to remove the last one bit from the number **n**. continue till the number n is zero.

**STEP 5:** Increment the count in every iteration of bitwise **and **operation, so we get the number of bits in that number by counting the number of times the operation needed to make number zero.

**STEP 6:** Return the count to the calling function using python basic methods.

` ````
def count_set_bits(n):
count = 0
while n:
n &= n - 1
count += 1
return count
n = int(input('Enter number: '))
print('Number of bits in that number:', count_set_bits(n))
```

Enter number : 9 Number of bits in that number : 2