#pragma warn macro directive in c _ suppress warning messages - c programming - c4learn

#pragma warn Macro Directive in C | Suppress WarningMessages

Topics : How to Suppress Warning Messages in C ?

What is Warning Message in C ?1.

What is Error and Message in C ?2.

#pragma warn Directive in C3.

Live Example4.

List of Warning Codes in ANSI5.

Warning Message :

A warning is a non-critical condition that does not require immediate attention.

Warning can be ignored.

Waring will never stop your execution of C Program.

Error Message

An Error is a critical condition that requires immediate attention.

Error messages cannot be ignored.

Compile Error wont let you to run C Program.

run Time Error will terminate current execution of C program

#pragma warn Macro Directive in C

In c there are many warning messages which can be on or off with help of #pragmawarn.

1.

Syntax :

#pragma warn +xxx#pragma warn xxx#pragma warn .xxx

Where

+ means on- means off. means on/off (toggle)

xxx is indicate particular warning code in thee alphabet.1.

Example : rvl warning code means function should return a value.2.

Live Example :

#include

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#pragma warn Macro Directive in C | Suppress Warning Messages - C Pr... http://www.c4learn.com/c-programming/c-pragma-warn-macro-directive/

1 of 3 8/8/2014 3:36 PM

#pragma warn rvlint main(){printf("It will not show any warning message");

}

Explanation :

-rvl mean suppress warning message .1.

rvl means : Function should return a value.2.

We have specified return type of main as Integer but we are not going to return avalue.

3.

Usually this program will show warning message.4.

We have suppressed warning already (-rvl) so we wont get any warning message.5.

Standard notation and there actual meaning is shown inside following table -6.

List of Warning Codes in C

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

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About the Author

Pritesh Taral is a Programmer, WebDeveloper and founder of c4learn.com, awidely-read programming site for beginners.Email: pritesh [at] c4learn.com


2 of 3 8/8/2014 3:36 PM

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

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#pragma warn macro directive in c _ suppress warning messages - c programming - c4learn

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