The first Application

Comments

The first Line is a comment:
// Hello World! - Our first Program
Comments are ignored by the compiler and should help you or others to understand your code. Comments can be marked as such by either putting two slashes in each line, or by using "/* comment here */.
// This is a comment
// over two lines

/* This is a comment, 
   over
   many lines, without
   marking each one */
You should not use Comments for explaining your program, it will explain itself.