# Base2 to Base10 Converter

#set binary test to false
is_binary = False

#get original Base 2
while is_binary == False:
 B2 = str(input('What binary number would you like to convert to denary? '))

#check is a binary number
 for i in B2:
   if i in ['0','1']:
      is_binary = True
   else :
      print('not a binary number')
      break

#copy to variable for conversion
a = B2

#get string length
l = (len(B2))

#CONTROL
#print (B2)
#print(len(B2))

rB2=''.join(reversed(B2)) #reverse order
#CONTROL
#print(rB2)

#Maniplate the string

#Loop to slice string into components,
#turn them into integers,
#multiply by appropriate exponent of 2
#then add them together

c = 0
B10 = 0
while c <= (l-1):
    #CONTROL
    #print (rB2[c])
    B10_new = int(rB2[c])*(2**(c))
    B10 = B10 + B10_new
    #CONTROL
    #print (B10)
    c = c+1

print('The Base2 number', B2,'converted to a decimal integer becomes ', B10, )