Return to Question

Inspired by this question which was further inspired by this one, write a program which takes two integers and adds them in a unique way, by performing an OR operation on the segments used to display them in a 7-segment display. For reference, the digits are represented in the following way:

Inspired by this question which was further inspired by this one, write a program which takes two integers and adds them in a unique way, by performing an OR operation on the segments used to display them in a 7-segment display. For reference, the digits are represented in the following way:

• Any digit plus itself equals itself
• 8 plus any digit equals 8
• 2 plus 1, 3, or 7 equals the letter 'a' (must be lower-case)
• 4 plus 7 equals either 'q' or 'Q', your choice
• Numbers should be right-aligned, so the digits should be added from right to left. If one number has more digits than the others, the extra digits at the beginning should be unchanged. There are no leading 0's, unless the number is exactly 0.
• All numbers will be 0 or greater. You don't need to handle a '-' sign. (Mainly because there's no good fit for the sum of a '-' and a '1' or '7'.)

• Any digit plus itself equals itself
• 8 plus any digit equals 8
• 2 plus 1, 3, or 7 equals the letter 'a' (must be lower-case)
• 4 plus 7 equals either 'q' or 'Q', your choice
• Numbers should be right-aligned, so the digits should be added from right to left. If one number has more digits than the other, the extra digits at the beginning should be unchanged. There are no leading 0's, unless the number is exactly 0.
• All numbers will be 0 or greater. You don't need to handle a '-' sign. (Mainly because there's no good fit for the sum of a '-' and a '1' or '7'.)

• Input: 12345, 123. Output: 12389
• Input: 88888, 42. Output: 88888
• Input: 0, 23. Output: 28

• Input: 12345, 123. Output: 12389
• Input: 88888, 42. Output: 88888
• Input: 0, 23. Output: 28
• Input: 120, 240. Output: a80
• Input: 270, 42. Output: 2Q8 (or 2q8)
• Input: 1234567890, 1234567890. Output: 1234567890