What is the purpose of a primary key?
What will be an ideal response?
A primary key uniquely identifies a record. Each record represents a single person, place, thing, or event. The primary key identifies which person, place, thing, or event it is. It also speeds access to your data and is used to form relationships.
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The command to kill 5 characters starting from the cursor position is:
a: [Alt-5] b: [Alt-x][Ctrl-y] c: [Ctrl-u] 5 d: [Ctrl-u] 5 [Ctrl-d] e: [Ctrl-x] [Ctrl-5]
Develop an application that calculates a salesperson’s commission from the number of items sold (Fig. 11.20). Assume that all items have a fixed price of 100 dollars per unit. Use a switch statement to implement the following sales commission schedule:
Fewer than 10 items sold = 1% commission
Between 10 and 39 items sold = 2% commission
Between 40 and 99 items sold = 3% commission
More than 99 items sold = 4% commission
a) Copying the template to your working directory. Copy the directory C:Examples Tutorial11ExercisesSalesCommissionCalculator to your C:SimplyJava directory.
b) Opening the template file. Open the SalesCommissionCalculator.java file in your text editor. In the template, line 127 in the calculateJButtonActionPerformed method obtains the number of items sold that was entered by the user, converts the number to an int value and assigns the value to the int local variable items. Line 129 declares the double constant DOLLARS_PER_UNIT to represent the cost for each item sold. Line 132 creates the DecimalFormat variable dollars that will be used to for- mat the gross sales and the salesperson’s earnings for display purposes.
c) Calculate the gross sales. In calculateJButtonActionPerformed, insert a stat
After a form is generated by a Form tool, the form cannot be modified
Indicate whether the statement is true or false
On a typewriter, fonts were measured in ________; today they are measured in ________
Fill in the blank(s) with correct word