Today’s most popular database systems are ________.
a) management databases
b) structural databases
c) formatted databases
d) relational databases
d) relational databases
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Q4: Method getSelectedIndex of class JComboBox returns:
a. the index of the selected item in the JComboBox. b. the selected item in the JComboBox, as a String. c. the index of the previously selected item. d. None of the above.
This causes the light wave to be bent.
What will be an ideal response?
Write a stub for the following function prototype:
``` double root( double a, double b, double c, int i); // Precondition: a != 0 and a, b, c are coefficients of // a quadratic equation a*x*x + b*x + c = 0 The value // of i is either +1 or -1 to choose which root. // Postcondition: return value, x, satisfies the // equation a*x*x + b*x + c = 0 ```
Which of the following is NOT true regarding a backup database?
A) The backup copy is as current as your real database, and saves you from having to recreate your database. B) A backup database is an extra copy of your database that you can use to protect yourself from the accidental loss of your database. C) Backups can help in cases of accidental deletion of data. D) You can return to the backup copy if you accidentally delete the real database.