User accounts on a computer network require passwords that contain 6 characters: The first character must be an upper-case letter (A-Z), the last character must be a digit (0-9), and the 4 middle characters can be either a lower-case letter (a-z), upper-case letter, or a digit. How many passwords are possible is allowed (repetition of characters is allowed based on the given requirements)? Enter your answer in the box below. Answer=

User accounts on a computer network require passwords that contain 6 characters: The first character must be an upper-case letter (A-Z), the last character must be a digit (0-9), and the 4 middle characters can be either a lower-case letter (a-z), upper-case letter, or a digit. How many passwords are possible is allowed (repetition of characters is allowed based on the given requirements)? Enter your answer in the box below. Answer=

Database System Concepts

7th Edition

ISBN:9780078022159

Author:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Publisher:Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan

Chapter1: Introduction

Section: Chapter Questions

Problem 1PE

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Inheritance and Polymorphism This assignment starts with the Account class from Labs 4 and 5. Our new and improved bank has two kinds of accounts, savings, and checking. In addition to an ID and a balance, savings accounts have an annual interest rate and a minimum balance. Checking accounts have a minimum balance and a monthly fee. Withdrawals and deposits can be made to both kinds of accounts. At the end of each month, savings accounts pay interest, but only if the account's balance is above the minimum. Also at the end of each month, a fee is deducted from each checking account, but the fee is waived if the account's balance is over the minimum. Tasks 1. Create a complete UML diagram which shows the relationships between the three classes, Account, Savings, and Checking and all of the fields and methods in each. The only modifications required to the Account class is the addition of two abstract methods called closeMonth and accountString. 2. The closeMonth function performs the…
Saira owns a small business and she frequently makes transactions. Sometimes she makes payments and other times payments are credited in her account. One of her customer Tania purchased a product and credited payment while another payment by Saira was in progress. Now the sequence of transaction is as follows:1. Tania’s account read amount in saira’s account2. Saira’s account read amount in saira’s account3. Tania added Rs. 500/- in original amount (that was lets suppose Rs. 60,000/ 4. Saira’s account subtracted Rs. 2000/- that she debited in someone else’s account form the original amount (that was Rs. 60,000) 5. Tania’s account committed the transaction 6. Saira’s account committed the transaction Draw the above-mentioned sequence in form of a table and see if there is a problem. What this problem is called and how can we avoid such kind of problem? Propose some solutions (at least two) and then explain which one is better and why?
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