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Python program to find number of bits necessary to represent an integer in binary

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mahmoud2506
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2022-05-25
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Given an integer number and we have to find necessary bits to represent it in binary in python.

To find necessary bits to represent a number – we use "bit_length()" method of "int" class, it is called with an integer object and returns the total number of bits to require to store/represent an integer number in binary.

Note: If the value is 0, bit_length() method returns 0.

Example:

    Input:
    num = 67 #binary: 1000011

    # function call
    print(num.bit_length())

    Output:
    7
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mahmoud2506
2022-05-25
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Python code to find bits to represent an integer number

# Python program to find number of bits 
# necessary to represent an integer in binary

# input a number
num = int(input("Enter an integer number: "))

# total bits to represent number
bits = num.bit_length()

print("bits required to store ", num, " = ", bits)
print("binary value of ", num, " is = ", bin(num))

Output

First run:
Enter an integer number: 67
bits required to store  67  =  7
binary value of  67  is =  0b1000011

Second run:
Enter an integer number: 3
bits required to store  3  =  2
binary value of  3  is =  0b11

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