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Python Program to Convert Hexadecimal to Binary



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In this article, we've created some programs in Python, to convert hexadecimal number entered by user to its equivalent binary value. Here are the list of programs:

Note - Before creating these programs, if you're not aware about steps used for the conversion, then refer to Hexadecimal to Binary Steps, Formula, Example to get every required things about the topic.

Hexadecimal to Binary using while Loop

To convert hexadecimal to binary number in Python, you have to ask from user to enter the hexadecimal number, then convert that number into its equivalent binary value as shown in the program given below:

print("Enter the Hexadecimal Number: ")
hexdecnum = input()

binnum = ""
hexlen = len(hexdecnum)
i = 0
while i<hexlen:
    if hexdecnum[i] == '0':
        binnum = binnum + "0000"
    elif hexdecnum[i] == '1':
        binnum = binnum + "0001"
    elif hexdecnum[i] == '2':
        binnum = binnum + "0010"
    elif hexdecnum[i] == '3':
        binnum = binnum + "0011"
    elif hexdecnum[i] == '4':
        binnum = binnum + "0100"
    elif hexdecnum[i] == '5':
        binnum = binnum + "0101"
    elif hexdecnum[i] == '6':
        binnum = binnum + "0110"
    elif hexdecnum[i] == '7':
        binnum = binnum + "0111"
    elif hexdecnum[i] == '8':
        binnum = binnum + "1000"
    elif hexdecnum[i] == '9':
        binnum = binnum + "1001"
    elif hexdecnum[i] == 'a' or hexdecnum[i] == 'A':
        binnum = binnum + "1010"
    elif hexdecnum[i] == 'b' or hexdecnum[i] == 'B':
        binnum = binnum + "1011"
    elif hexdecnum[i] == 'c' or hexdecnum[i] == 'C':
        binnum = binnum + "1100"
    elif hexdecnum[i] == 'd' or hexdecnum[i] == 'D':
        binnum = binnum + "1101"
    elif hexdecnum[i] == 'e' or hexdecnum[i] == 'E':
        binnum = binnum + "1110"
    elif hexdecnum[i] == 'f' or hexdecnum[i] == 'F':
        binnum = binnum + "1111"
    i = i+1

print("\nEquivalent Binary Value: ", binnum)

Here is its sample run:

hexadecimal to binary python

Now supply the input say 1D4 as hexadecimal number and press ENTER key to convert and print its equivalent binary value as shown in the snapshot given below:

convert hexadecimal to binary python

The dry run of above program with hexadecimal number input 1D4 goes like:

Modified Version of Previous Program

This program uses end= to skip printing of an automatic newline using print(). In this program, I've also added an else part to handle the thing when all conditions evaluates to be false.

Inside else, I've assigned 1 to chk and using break keyword, the remaining execution of while loop gets skipped. And after exiting from the loop, either by evaluating its condition as false, or by using break keyword, I've checked the value of chk. That is, if it equal to 0 (initial value), then program flow never goes to else's body. Means, no any invalid hex digit was entered by user. Otherwise print a message like invalid input as shown in the program given below:

print("Enter the Hexadecimal Number: ", end="")
hnum = input()

bnum = ""
chk = 0
hlen = len(hnum)
i = 0
while i<hlen:
    if hnum[i] == '0':
        bnum += "0000"
    elif hnum[i] == '1':
        bnum += "0001"
    elif hnum[i] == '2':
        bnum += "0010"
    elif hnum[i] == '3':
        bnum += "0011"
    elif hnum[i] == '4':
        bnum += "0100"
    elif hnum[i] == '5':
        bnum += "0101"
    elif hnum[i] == '6':
        bnum += "0110"
    elif hnum[i] == '7':
        bnum += "0111"
    elif hnum[i] == '8':
        bnum += "1000"
    elif hnum[i] == '9':
        bnum += "1001"
    elif hnum[i] == 'a' or hnum[i] == 'A':
        bnum += "1010"
    elif hnum[i] == 'b' or hnum[i] == 'B':
        bnum += "1011"
    elif hnum[i] == 'c' or hnum[i] == 'C':
        bnum += "1100"
    elif hnum[i] == 'd' or hnum[i] == 'D':
        bnum += "1101"
    elif hnum[i] == 'e' or hnum[i] == 'E':
        bnum += "1110"
    elif hnum[i] == 'f' or hnum[i] == 'F':
        bnum += "1111"
    else:
        chk = 1
        break
    i = i+1

if chk==0:
    print("\nEquivalent Binary Value = ", bnum)
else:
    print("\nInvalid Input!")

Here is its sample run with hexadecimal input 24YD:

python convert hexadecimal to binary

Note - Since Y is not a valid hex digit, therefore the above output, Invalid Input was produced.

Hexadecimal to Binary using int() and bin()

This program uses int() and bin() methods to do the same job in more precised code as Python known for.

print("Enter the Hexadecimal Number: ", end="")
hnum = input()

hnum = int(hnum, 16)
bnum = bin(hnum)
print("\nEquivalent Binary Value = ", bnum)

Here is its sample run with user input, 1DF3 as hexadecimal number input:

python hexadecimal to binary using int bin

Note - To print only binary value, that is to skip first two characters from the above output, put [2:] just after the bnum variable while printing. That is, replace the following statement:

print("\nEquivalent Binary Value = ", bnum)

with the statement given below:

print("\nEquivalent Binary Value = ", bnum[2:])

Now the output looks like:

hexadecimal to binary conversion in python

Hexadecimal to Binary using Function

This program is created using user-defined and predefined functions. The name of user-defined function used in this program is HexToBin(). This function receives a value as its argument and returns its equivalent binary value using bin() and int() method.

def HexToBin(h):
    return bin(int(h, 16))

print("Enter the Hexadecimal Number: ", end="")
hnum = input()

bnum = HexToBin(hnum)
print("\nEquivalent Binary Value = ", bnum[2:])

Hexadecimal to Binary using Class

This is the last program of this article, created using a class named CodesCracker, an object-oriented feature of Python.

class CodesCracker:
    def HexToBin(self, h):
        return bin(int(h, 16))

print("Enter the Hexadecimal Number: ", end="")
hnum = input()

obj = CodesCracker()
bnum = obj.HexToBin(hnum)
print("\nEquivalent Binary Value = ", bnum[2:])

In this program, an object named obj of class CodesCracker is created to access its member function named HexToBin() using dot (.) operator. Rest of the things works like a normal function.

Same Program in Other Languages

Python Online Test


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