You do not have to use prototypes; so long as you define the function before you use it, it will work. In addition to Bazzy's words, if you ever want to use a function that you did not write and are not going to be compiling yourself (which I expect is very, very often), the compiler must still know what will be passed in and what will be returned. Last edited on.
Many myths cloud the emergence and prominence of shellac after the appearance of nitro cellulose. One chief legend states shellac is not waterproof. Shellac, just as many other finishes, is not waterproof, however, it is quite water resistant. Shellac can easily withstand water for about 4 hours. Even if the surface is not wiped, the resulting faint white stain will still fade away as it dries.
Shellac based primer is shellac with white die and pigment in it. Shellac is one of the best stain blockers around, bar none. Shellac is an alcohol based product. Not oil or water. So you will need to buy some denatured alcohol to clean up with. Paint thinner, mineral spirits or soap and water won't work.