Question

Instructions

Good news! You have are nearly finished with the semester! Today’s problem is going to be to modify a program to match the actual check used to verify Social Insurance Numbers.

Don’t worry, the first part of the solution has been taken care of for you. You just need to modify it to also check the bits in BOLD font.

• A valid SIN is calculated by multiply odd-positioned digits (1st, 3rd, 5th, 7th, & 9th) by 1 and even-positioned digits (2nd, 4th, 6th, & 8th) by 2.
  
• If any of those values (digit times multiplier) is greater than 9, both digits within it are summed. For example, if the product were 16, we would add 1+6 to get 7 (instead of using 16) for future calculations.
  
• These values are totaled. If the resulting number is divisible by 10, the SIN is valid.

Update the validateSIN() function to reflect that modification.

Details

Input

• The main method will read in a String, the SIN to be validated, and pass this string as an argument to the function validateSIN().

Processing

• Make sure that appropriate steps are taken within the function validateSIN to check that the SIN is valid (as describe above). Note that some of the steps of validation have been taken care of for you. You must complete the rest.

Output

• Output will be taken care of for you in the main method.

Sample input/output:

Input	Output
181-111-212	SIN: 181-111-212 VALID
974-432-432	SIN: 974-432-432 -INVALID-

There is given code

def validateSIN ( sin ):
"""
FUNCTION: sumPostCodeNumbers( string) -> boolean

Args:
@param sin (str): containing the SIN of form "999-999-999"

Returns:
@return boolean: True if valid SIN, False otherwise
"""
  
  
checkSum = 0
  
isValid = False
  
sin = sin.replace("-", "")

for i in range(9) :
multiplier = 1 + i % 2
digit = int( sin[i] )
numberToAdd = digit * multiplier
  
checkSum += numberToAdd
  
  

if checkSum % 10 == 0 :
isValid = True

return isValid

#=========================================================================
# PLEASE END YOUR WORK HERE
#=========================================================================
      
def main() :
  
SIN = input()
  
sinIsValid = validateSIN(SIN)
  
print("SIN: " + SIN)
  
if sinIsValid :
print("VALID")
else :
print("-INVALID-")

  
return

#-----------------#
# Body of program #
#-----------------#

main()

Answer 1

def validateSIN(sin):
    """
    FUNCTION: sumPostCodeNumbers( string) -> boolean

    Args:
    @param sin (str): containing the SIN of form "999-999-999"

    Returns:
    @return boolean: True if valid SIN, False otherwise
    """

    sin = sin.replace('-', '')
    total = 0
    for i in range(len(sin)):
        n = int(sin[i])
        if i % 2 == 1:
            n *= 2
        total += (n // 10) + (n % 10)
    return total % 10 == 0


# =========================================================================
# PLEASE END YOUR WORK HERE
# =========================================================================

def main():
    SIN = input()
    sinIsValid = validateSIN(SIN)
    print("SIN: " + SIN)
    if sinIsValid:
        print("VALID")
    else:
        print("-INVALID-")
    return


# -----------------#
# Body of program #
# -----------------#

main()