Difference between .com program and .exe program. AND Warning code in c programming

Difference between .com program and .exe program.

Answer:

Both .com and .exe program are executable program but .com program execute faster than .exe program. All drivers are .com program.

Warning code in c programming

S.N.	Warning message	Code
ANSI Violations
1	Assigning 'type' to 'enumeration'	eas
2	Bit fields must be signed or unsigned int	bbf
3	Both return and return with a value used	ret
4	Declare type 'type' prior to use in prototype	dpu
5	Division by zero	zdi
6	Hexadecimal value contains more than 3 digits	big
7	Initializing 'enumeration' with 'type'	bei
8	'identifier' is declared as both external and static	ext
9	Ill-formed pragma	ill
10	Initialization is only partially bracketed	pin
11	Redefinition of 'macro' is not identical	dup
12	Suspicious pointer conversion	sus
13	Undefined structure 'structure'	stu
14	Void functions may not return a value	voi
Frequent Errors
1	Code has no effect	eff
2	Function should return a value	rvl
3	Parameter 'parameter' is never used	par
4	Possible use of 'identifier' before definition	def
5	Possibly incorrect assignment	pia
6	Unreachable code	rch
Less Frequent Errors
1	Ambiguous operators need parentheses	amb
2	Array variable 'identifier' is near	ias
3	Call to function with no prototype	pro
4	Call to function 'function' with no prototype	pro
5	Condition is always false	wccc
6	Condition is always true	wccc
7	'identifier' declared but never used	use
8	'identifier' is assigned a value that is never used	aus
9	No declaration for function 'function'	nod
10	Structure passed by value	stv
11	Superfluous & with function	amp
Portability Warnings
1	Constant is long	cln
2	Constant out of range in comparison	rng
3	Conversion may lose significant digits	sig
4	Non portable pointer comparison	cpt
5	Non portable pointer conversion	rpt
6	Mixing pointers to signed and unsigned char	ucp