main.py

# Declares the decimal to binary conversion (decToBin)

def decToBin():
    print("Typ hier uw decimale nummer in (integraal)")
    decimalInput = int(input())

    binary = []
     # function converts decimal to binary by dividing by 2 and checking for remainders. 
    while decimalInput != 0:
        if decimalInput % 2 == 0:
            decimalInput = decimalInput / 2
            binary.insert(0,0)
        else:
            decimalInput = (decimalInput - 1) / 2
            binary.insert(0,1)
    print(binary)


# Declares the binary to decimal conversion (binToDec)

def binToDec():

    arrayCounter = 0
    decResult = 0
    counter = 0

    print("Typ hier uw binaire nummer in")

    strInput = input()

    # Checks if input is binary
    checkBin = set(strInput)
    checkSource = {'0','1'}

    if checkSource == checkBin or checkBin == {'0'} or checkBin == {'1'}:
        print(" ")
    else:

        print("dit is geen binair getal!")
        print(" ")
        return


    # Separates the string into separate digits in an array and defines the length of it
    convertedArray = [int(d) for d in str(strInput)]
    arrayLength = len(convertedArray)
    
    # Sets power raised
    power  = arrayLength - 1
    # Converts binary to decimal by multiplying the numbers by 2 to the correct power (defined by the array length)
    while arrayLength != 0:
        decResult = decResult + convertedArray[counter] * 2 ** power
        counter = counter + 1
        power = power - 1
        arrayLength = arrayLength - 1
    
    print(decResult)



# start of main function 

while True:
    print("Binair naar decimaal of decimaal naar binair?")
    print ("A=Dec-bin B=Bin-dec C=Programma verlaten")
    # User input to choose converting method or to quit
    
    opt = input()
    if opt == "A" or opt == "a":
        print(" ")
        decToBin()
        print(" ")

    elif opt == "B" or opt == "b":
        print(" ")
        binToDec()
        print(" ")
    
    elif opt == "C" or opt == "c":
        print(" ")
        print("Dag!")
        break
    else:
        print(" ")
        print("Selecteer \"a\",  \"b\" of \"c\" a.u.b")
        print(" ")