They are processed before compilation. A rule can do harm by prohibiting something that is useful in a given situation. Take the time to understand the implications of a guideline rule on your program. A preprocessor directive begins with hash sign. It is an optimization technique used by the compilers as it saves time in switching between the functions otherwise.
You could also declare many variables in one statement separating with commas as in the third statement.
This line is optional. Preprocessor directives begin with a hash signe. You can declare one variable in one statement as in the first two statements. Whitespaces: Blank, tab, and newline are collectively called whitespaces.
But different people have different needs. Step 5: Load the executable code into computer memory.