1. They are placed at the
beginning of the program.
2. They start with a
pound/hash
(#)
sign
. This is its syntax (rule).
3. There is no semicolon at the end of these directives.
4. They can
start in any column but usually they start in column number 1.
5. They tell the compiler
to include the standard input/output library file in the
program. This
library file prints a message on to the screen. Actually, printing is one of the input/output
processes identified in this library.
6. The syntax of this command as shown in line 1 must be
exact
.
7. There is no space between the pound/hash sign and
the reserved keyword
include
.
8.
It tells the preprocessor that you want the library file in the angular brackets (< >) to be
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