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Information Technology Questions and Answers

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Find Information Technology questions and answers with clear, step-by-step explanations to help you understand technical concepts and improve exam performance. These solutions cover topics commonly included in coursework and technical assessments.

Browse IT practice questions covering areas such as programming logic, database queries, networking concepts, and system operations. Each answer explains both the concept and the reasoning behind the solution.

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Question:

Write a java code using the luhn checksum validation algorithm to check whether a credit card is valid or fake Example of execution of the algorithm: Suppose you want to check that your credit card number is valid. You credit card number is 8273123273510569 . Let's see how to check it: | 0 | 2 | 7 | 3 | 1 | 2 | 3 | 2 | 7 | 3 | 5 | 1 | 0 | 5 | 6 | 9 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | | | | | | | | | | | | | | | First, you are going to double every other number, starting with the first number (here, it is number 8): | 0x2 | 2 | 7x2 | 3 | 1x2 | 2 | 3x2 | 2 | 7x2 | 3 | 5x2 | 1 | 0x2 | 5 | 6x2 | 9 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | | | | | | | | | | | | | | | And you obtain: | 16 | 2 | 14 | 3 | 2 | 2 | 6 | 2 | 14 | 3 | 10 | 1 | 0 | 5 | 12 | 9 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | | | | | | | | | | | | | | | But we do not want double digits, so for every number that now has double digits, we add these digits: | 1+6 | 2 | 1+4 | 3 | 3 | 2 | 6 | 2 | 1+4 | 3 | 1+8 | 1 | 0 | 5 | 1+2 | 9 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | | | | | | | | | | | | | | | And we obtain: | 7 | 2 | 5 | 3 | 2 | 2 | 6 | 2 | 5 | 3 | 1 | 1 | 0 | 5 | 3 | 9 | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | | | | | | | | | | | | | | | | Now we add all of these numbers: $7+2+5+3+2+2+6+2+5+3+1+1+0+5+3+9=56$ 56 is not a multiple of 10 , so the credit card number was a fake.

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12 months ago
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