IOS Programmer IOS Programmer - 1 month ago 21
Python Question

Python Denary to Binary Convertor

Hi can you please help me convert denary values to binary and hex? I have to input a number between 0 and 15 and the output should be its hexadecimal and binary equivalent. Here's what I've done so far:

denary_list= ["0","1","2","3","4","5","6","7","8","9","10","11","12","13","14","15"]
print("denary list")


binary_list=["0000","0001","0010","0011","0100","0101","0110","0111","1000","1001","1010","1011","1100","1101","1110","1111"]
print("binary list")

hex_list=["0","1","2","3","4","5","6","7","8","9","A","B","C","D","E","F"]
print("hex list")
option=input("enter choice:\n1.print values\n2.convert denary number to binary and hex\n3. Convert a hex value between 0 and 15 to denary or binary value\n9. Quit")
if option=='1':
print ("denary","\t","binary","hex")
count1=0
while count1<len(denarylist) and count1<len(binarylist) and count1<len(hexlist):
print(denarylist[count1],"\t",binarylist[count1],"\t",hexlist[count1])
count1+=1
if option=='2':
number=int(input("what number do you choose to convert to binary and hex"))
if number<=15 and number>=0:

Answer

Use the format method instead with b and x format codes to format integers as hexadecimal or binary numbers:

>>> format(1234, 'b')
'10011010010'
>>> format(1234, 'x')
'4d2'

Use int('01234fff', 16) to convert a hex string into a number; likewise int('11110000', 2) to convert a binary string into a number.


And to answer your original question: you can get numberth item (zero-based indexing) with binary_list[number] and so you can write your option 2 as

number = int(input("what number do you choose to convert to binary and hex"))
if 0 <= number <= 15:
    print("the number in binary is", binary_list[number])
    print("the number in hex is", hex_list[number])
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