callback function::A function within an application that Windows calls.
case label::The case keyword and the constant, or constant expression, that follows it.
character code::A numeric code that represents a character. The default ASCII character set used in all PCs and PS/2s comprises 256 eight-bit character codes.
character constant::A character enclosed in single quotes, for example, 'p'. A character constant has a type of char. See “string constant.”
character set::A set of alphabetic and numeric characters and symbols.
client area::The portion of the window within the window borders.
clipping::The process of determining which parts of a graphics image lie within the clipping region. Parts of the image that lie outside this region are “clipped”; that is, they are not displayed.
clipping region::The rectangular area of the screen where graphics display occurs.
command-line argument::A value passed to a program when the program begins execution.
conditional expression::An expression consisting of three operands joined by the ternary (? :) operator. Similar to an if-else construct, a conditional expression is used to evaluate either of two expressions depending on the value of a third expression.
constant expression::An expression that evaluates to a constant. A constant expression may involve integer constants, character constants, floating-point constants, enumeration constants, type casts to integral and floating-point types, and other constant expressions.
control::A small window that has a very simple input or output function, such as an edit control: a simple window that lets the user enter and edit text.