Having the prototype available before the first use of the function allows the compiler to check that the correct number and type of arguments are used in the function call and that the returned value, if any, is being used reasonably. The function definition itself can act as an implicit function declaration.
While shellac is not usually the finish paint choice, it is often thought of as the best paint primer available. It has properties that oil and water based paints can't match, and provides a more dependable seal than most other primers are able to provide.
Both gel polish and Shellac are additions to a traditional salon manicure. Shellac is a brand by Creative Nail Design, or CND, and is called Power Polish.. It is the original long-wear polish and comes in 61 colors. Harmony Gelish, OPI Gels, and Essie Gels are other typical brands of gel polish. Gelish comes in 141 colors, OPI in 71 colors, and Essie in 36 colors.