Download Programming Fundamentals: TextBox Control, Variables and Data Types and more Quizzes Computer Science in PDF only on Docsity!
TextBox Control
A rectangular area that can accept keyboard input from the user. TERM 2
Clearing contents
DEFINITION 2 To clear the contents of a TextBox control you assign an empty string ("") to the control's Text property.ex.nameTextBox.Text=""; TERM 3
Variable
DEFINITION 3 A storage location in memory that is represented by a name. TERM 4
Variable Declaration
DEFINITION 4 Specifies two things about the variable: The variable's data type, which is the type of data the variable will hold The variable's name Written in the general format: DataType VariableName; TERM 5
Data Type
DEFINITION 5 A variable's data type indicates the type of data that the variable will hold.ex. strings, integers, real numbers (These data types are known as primitive data type)
Variable Name
A variable name identifies a variable in the program code. When naming a variable, you should always choose a meaningful name that indicates what the variable is used for. TERM 7
Rules for naming a variable
DEFINITION 7 The first character must be one of the letters a/A through z/Z or an underscore character (_). After the first character, you may use the letters a/A through z/Z, the digits 0 through 9, or underscores. The name cannot contain spaces. TERM 8
String data type
DEFINITION 8 A variable of the string data type can hold any string of characters. After the variable has been declared, you can use the assignment operator (=) to store a value in the operator.ex. string productDescription; productDescription = "Italian Espresso Machine"; TERM 9
Concatenation
DEFINITION 9 Appending one string to the end of another string. Use the + operator to concatenate strings. ex. string message;message = "Hello" + " world"MessageBox.Show(message); TERM 10
Local Variables
DEFINITION 10 Variables that are declared inside a method. A local variable belongs to the method in which it is declared and only statements inside that method can access the variable.
