Some Important
Point About C language
(1)C is a
structured, high level,machine independent language.
(2)ANSI C and C99
are the standardized versions of C language.
(3)C combines the
capabilities of assembly language with the features of a high level language.
(4)C is
robust,portable and structured programming language.
(5)Every C
language requires a main() function(Use of more than one main() is illegal).
The place main is where the program execution begins.
(6)The execution
of a function begins at the opening brace of the function and ends at the
corresponding closing brace.
(7)C programs are
written in lowercase letters. However, uppercase letters are used for symbolic
names and output strings.
(8)All the words
in a program line must be separated from each other by the at least one
space,or a tab, or a punctuation mark.
(9)Every program
statement in a C language must end with a semicolon.
(10)All variables
must be declared for their types before they are used in the program.
(11)A comment can
be inserted almost anywhere a space can appear. Use of appropriate comments in
proper places increase readability and understand-ability of the program and
helps users in debugging and testing. Remember to match the symbols /* and *
appropriately.
(12)Compiler
directives such ad define and include are special instructions to the compiler
to help it compile a program. They do not end with a semicolon.
(13)The sign # of
compiler directives must appear in the first column of the line.
(14)We must make
sure to include header files using
#include directive when the program refers to special names and
functions that it does not define.
(15)The structure
of a c program comprises of various sections including Documentation,Link ,
Definitiion, Global Declaration, main() function and Sub program section.
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