ex311

##Reads a whole number (an integer) in base 10 and converts it to binary
decin='xx' #to force initial read of number
while not(decin.isnumeric()): #looks while invalid (nn numeric input)
    decin=input('enter a denary number to convert (whole number) ')
    decin=decin.strip() #strip leading and trailing spaces

cfwd=int(decin)  #copy the number and convert to integer
if (cfwd==0):
    binaryout="0" #case of a 0 input
else:
    binaryout=""  #set initial string to blank
while (cfwd!=0): #loop while there are bits to process
    remain=cfwd%2 #get the remainder to give next bit
    binaryout=str(remain) + binaryout #prepend that bit as a character to output string
    cfwd=cfwd//2 #float divide for next binary digit position

print( "The value of denary ", decin, " in binary is ", binaryout)