Whether the identifier denotes an object of user-defined type or a type derived from a user-defined type. Whether the identifier denotes a function or a type derived from a function. The number of arguments to a function. The dollar sign is also a valid identifier in Visual C++.
Known to ancient Egyptians, watercolor painting is one of the oldest art forms. Artists from medieval times used watercolors for the illumination of parchment papers, but during the 16th, 17th and 18th centuries, watercolors were restricted to miniature paintings on card, ivory, parchment or porcelain.
The important distinction between them is that the watercolorist applies the paint in transparent washes and uses the paper as the source of all whites; the gouache painter mixes colors directly with white paint to create each of the hues and tints and completely covers the surface of the paper resulting in a thick velvety surface texture.