Which of the following statements is (are) true?
A. We can use inheritance to customize existing software.
B. A base class specifies commonality.
C. A base class can be modified without modifying derived classes
D. A derived class can be modified without modifying its derived class.
a) All of the above
b) None of the above
c) A, B and C
d) A, B and D
a) All of the above
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Answer the following statements true (T) or false (F)
1) To add an item to a ListBox use the Add method of the Items property. 2) To remove an item from a ListBox, use the Delete method of the Items property. 3) The SelectedIndex property returns the index of the selected item. 4) If the user has not selected any items from the ListBox then SelectedIndex returns 0.
Consider a database schema with four relations: Supplier, Product, Customer, and Contracts. Both the Supplier and the Customer relations have the attributes Id, Name, and Address. An Id is a nine-digit number. Product has PartNumber (an integer between 1 and 999999) and Name. Each tuple in the Contracts relation corresponds to a contract between a supplier and a customer for a speci?c product in a certain quantity for a given price.
a. Use SQL DDL to specify the schema of these relations, including the appropriate integrity constraints (primary, candidate, and foreign key) and SQL domains. b. Specify the following constraint as an SQL assertion: there must be more contracts than suppliers.
Property settings can be changed in the ________
Fill in the blank(s) with correct word
List the three things that you need to know to design effective methods.
What will be an ideal response?