#By Rayner Da Cruz
import time
n=0
while n!=1:
    error=True
    error1=True
    error2=True
    print"\n"
    print"                  *************************************"
    print"                  *!Welcome to RBDC BinAdd Calculator!*"
    print"                  *+++++++++++++1-Bin_Add+++++++++++++*"
    print"                  *+++++++++++++++2-Exit++++++++++++++*"
    print"                  *************************************"
    print"                              Build 1.9.5 FINAL\n"

    while error:
        try:
            choice=input("Select a Option: ")
            print "\n"
            if choice >=3:
                print"Please enter a number between 1-2."
            error=False
        except NameError:
            print"Not a number. Please try again."
            time.sleep(1)
        except SyntaxError:
            print"Not a number. Please try again."
            time.sleep(1)

    if choice ==1:
        print"***You have selected Bin_Add.***\n"
        while error1:
            try:
                bin2dec = raw_input("Please enter 1st binary number: ")
                bin2dec2 = raw_input("Please enter 2nd binary number: ")
                error1=False
            except NameError:
                print"Enter a Binary number. Please try again.\n"
                time.sleep(0.5)
            except SyntaxError:
                print"Enter a Binary number. Please try again.\n"
                time.sleep(0.5)

            decimal=0
            for i in bin2dec:
                decimal= decimal * 2 + int(i)

            decimal2=0
            for i in bin2dec2:
                decimal2= decimal2 * 2 + int(i)

            a=decimal+decimal2  #adds the 2 variables and converts to binary
            c=decimal+decimal2

            b = ''
            while a>0:
                b = str(a % 2) + b
                a >>= 1
            print "\n",c,"=",str(b),"<<This is your answer!" #prints output dec = number in binary with dec equivalent.

    if choice==2:
        while error2:
            try:
                endex=input("Do you want to Exit? \nInput (1)y or (2)n: ")
                if endex== 0 or endex >=3:
                    print"Try again"
                if endex==2:
                    print "You have chosen to run this programme again...\n"
                if endex==1:
                    print "\nThank you for using RBDC Bin2Dec Converter \nGoodbye"
                    time.sleep(1)
                    break
                    error2=False

            except NameError:
                print"\nError. Enter 1 or 2."
            except SyntaxError:
                print"\nError. Enter 1 or 2."

#By Rayner Da Cruz