convert from python to #C

Solution:

# Python program to calculate checksum of ISBN number ISBN_12string = input(" Enter the first 12 digits of an ISBN-13 as a string: ")

#ISBN_12number = int(ISBN_12digit)

checksum = 0 var = [0,0,0,0,0,0,0,0,0,0,0,0] i=0

for ch in ISBN_12string: var[i] = int(ch) i = i + 1 checksum = 10-(var[0] + 3*var[1] + var[2] + 3*var[3] + var[4] + 3*var[5] + var[6] + 3*var[7] + var[8] + 3*var[9] + var[10] + 3*var[11] )

checksum = checksum % 10

if checksum == 10: checksum = 0

print('The ISBN-13 number is {0}{1}'.format(ISBN_12string, checksum))