Create an online contacts directory application that saves entries to a single text file. Include standard contact directory fields in the text file such as first name, last name, email address, phone number, street address, city, state, and zip code. You will want to plan how to save this data to the file for easy retrieval.

7. design a circuit with three inputs (x, y, and z) representing the bits in a binary number, and three outputs (a, b, and c) also representing bits in a binary number. when the input is 1, 2, or 3, the binary output should be one lesser than the input. when the input is 4, 5, or 6, the binary output should be one greater than the input. when the input is 0, the output is 0, and when the input is 7, the output is 7. show your truth table, all computations for simplification, and the final circuit.