Convert binary to gray code in Python

In this tutorial, we will learn to convert binary to gray code in Python. A binary number is a number that is expressed in the base-2 numeral system. Therefore, a binary number is formed using 0’s and 1’s only. So today, we will get to know the representation of binary and gray code numbers, conversion of a binary number to gray code, and a Python program to convert binary number to gray code.

Representation of binary number and gray code

Any binary number is represented using 0 and 1 only i.e. every binary number is a sequence of 0’s and 1’s.

For example –> Binary number – 101110

Gray code belongs to the class minimum change codes. It is an encoding of numbers such that there is only one bit that differs in each successive number.

For example-

• The gray code of number 6 is 0101 and 7 is 0100.
• The gray code of number 10 is 1111 and 11 is 1110.

In both examples, there is only one-bit change.

Method to convert a binary number to gray code

So now we will learn to convert a binary number to its equivalent gray code number. Remember, the number of bits in binary and its equivalent gray code will be equal always. A gray code also contains only 0’s or 1’s. To convert binary number to gray code, we need to perform exclusive-OR (XOR) operation. So, let us see how to perform XOR operation and how to convert a binary number.

Exclusive-OR (XOR) operation-

For the conversion of a binary number to gray code, we will follow the rules given below-

• The most significant bit (MSB) of gray code is the MSB of the given binary number.
• To find the next bit, take the exclusive-OR (XOR) of MSB and the next bit of binary number.
• Similarly, to find the next bit, take the XOR of the second and third bit from MSB of the binary number.
• In this way, find the remaining bits of the equivalent gray code.

To understand this more clearly, let us find the equivalent gray code for binary number 10110.

• The MSB of gray code is the MSB of the given binary number.
• To find the remaining bits of gray code, we perform XOR operation as follows-

Finally, we get the equivalent gray code i.e. 11101.

Python program to convert binary number to gray code

Now, we will see a Python program to convert binary number to gray code.

```def convert_gray(binary):
binary = int(binary, 2)
binary ^= (binary >> 1)
return bin(binary)[2:]

binary_num = input("BINARY NUMBER : ")
gray_code = convert_gray(binary_num)
print("EQUIVALENT GRAY CODE IS : ",gray_code)```

In the above program-

• Firstly, we take a binary number from the user.
• We call the function ‘convert_gray’ and pass the binary number.
• The function ‘int()’ converts the binary number to a decimal integer number as follows-
int(string, base) –> Here, the string is the binary number and the base for a binary number is 2.
• Then, we perform the XOR operation of number with another number obtained by right shifting the number by 1 bit.
binary ^= (binary >> 1) –> The symbol ‘^’ denotes XOR operation. XOR is performed between ‘binary’ and ‘binary >> 1’ where the symbol ‘>>’ denotes the right shift and 1 denotes the right shift by 1 bit.
• At last, we convert the resultant decimal number to binary string i.e. gray code.
• Finally, the function returns the equivalent gray code of the given binary number.

Python program output

The above Python program displays the equivalent gray code for the given binary number. So, the output after sample execution is-

```[email protected]:~/python\$ python3 gray.py
BINARY NUMBER : 1001
EQUIVALENT GRAY CODE IS :  1101
si[email protected]:~/python\$```

So, the gray code for binary number 1001 is 1101. Therefore, using this program, we can find the gray code for any binary number.

Thank you for reading this tutorial and I hope it helps you.

One response to “Convert binary to gray code in Python”

1. Vivekanand R k says:

Hi,
I am getting an error as below:
TypeError: int() can’t convert non-string with explicit base