Converting Decimal Number To Binary In Python 3

When I try to convert Decimal To Binary, The code executes with no error but the result is 'none'. Sometimes it just doesn't show anything. I feel there is some logical error can a

Solution 1:

Here are a few problems with your code:

1. rem = [] is inside the while loop, so in every loop iteration rem will become [] and in the end it will have only the last bit stored in it.

2. The order of // and % operation is wrong, // will first truncate the data and % will always produce 0. You need to reverse the order of those operations.

3. reverse is a list method that does in place reversal and returns None. That's why your code always prints None. So, you need to use rem.reverse() before the last print line and print rem normally.

After these changes, your code will look like this:

defbin_no():
    global rem
    
    n = int(input("Enter Number : ")) #Taking a Decimal Num
    
    rem = []
    while n >=1 :   #Initiating a Loop to Convert Decimal To Binary using the (Divide By 2 Method).
        rem.append(n%2)
        n = n//2if n >=1:  #Going back to the loop if input is invalid.print("Please enter a Valid Number")
        bin_no()
    rem.reverse()
    print("Binary Number : ", rem) #Printing the result (the binary no. was stored in reverse order.)

bin_no()

Solution 2:

You don't need a recursive call here. It might produce some troubles.

def bin_no()
    n = 0while n < 1:
        n = int(input("Enter a Valid Number : "))
    rem = []
    while n > 0:
        rem.append(n % 2)
        n //= 2
    rem.reverse()
    print("Binary Number : ", rem)

Solution 3:

Let’s try to understand the decimal to binary conversion. The easiest technique to convert the decimal numbers to their binary equivalent is the Division by 2.

In Division by 2 technique, we continuously divide a decimal number by 2 and note the reminder, till we get 1 as our input value, and then we read the noted reminders in reverse order to get the final binary value.

Ways to Convert Decimal To Binary in Python

1. Using Custom Recursive Function

Code

# RecursiveFunctiontoconvertdecimaltobinary
def decimalToBinary(ip_val):
    if ip_val >=1:
    # recursivefunctioncall
        decimalToBinary(ip_val //2)
    
    # printing remainder fromeachfunctioncall
    print(ip_val %2, end='')
 
# Driver Code
if __name__ =='__main__':
    # decimalvalue
    ip_val =24
     
    # Calling special function
    decimalToBinary(ip_val)

2. Using Built-in Function

Code

# Function to convert decimal to binary# using built-in python functiondefdecimalToBinary(n):
    # converting decimal to binary# and removing the prefix(0b)returnbin(n).replace("0b", "")
   
# Driver codeif __name__ == '__main__':
    # calling function# with decimal argumentprint(decimalToBinary(77))

3. Without using Built-in Function

Code

# Function to convert Decimal to BinarydefdecimalToBinary(val):
    return"{0:b}".format(int(val))
   
# Driver codeif __name__ == '__main__':
    print(decimalToBinary(77))