Yahoo Web Search

Search results

1. Top results related to define statement in c

   • return statement in macro(#define) in C

     Top Answer

     Answered Sep 13, 2011 · 6 votes

     Simply do:

     #define sent_same_text(txt) (txt)-

     You only need return for functions. A macro is different in that it is a literal string insertion into your code. Make sure you have the parentheses around txt.

     Check all answers on Stack Overflow

     1/5

   • Define statement expected a declaration C++

     Top Answer

     Answered May 23, 2017 · 3 votes

     The problem is with the the #endif directive which is located inside the definition of the class (before the }; code), thus a second inclusion of this header file will only include the }; code causing the errors you got.

     BTW, instead of using the #ifndef pattern you can simply use #pragma once

     at the beginning of your file which has the same effect. You can read more about pragma once vs. using include guards in here.

     Check all answers on Stack Overflow

     2/5

   • Symbolic constants in C (#define statement)

     Top Answer

     Answered Oct 15, 2013 · 3 votes

     Regarding these defines, it doesn't, the expanded macros doesn't have a type. The pre-processor which processes the #define is just replacing text within the source code

     When you use these defines somewhere, e.g.

     int i = INTEGER_EXAMPLE;-

     This will expand to

     int i = 2;-

     Here the literal 2 (which in this context is an int) is assigned to an int.

     You could also do:

     char c = INTEGER_EXAMPLE;-

     Here too, the literal 2 is an int, and it is assigned to a char. 2 is within the limits of a char though, so all is ok.

     You could even do:

     int INTEGER_EXAMPLE = 2;-

     This would expand to

     int 2 = 2;-

     Which isn't valid C.

     Other Answers

     Answered Oct 15, 2013 · 10 votes

     #define-d names have no types. They just define textual replacements.

     What the compiler is seeing is the preprocessed form. If using GCC, try gcc -C -E somesource.c and have a look at the (preprocessed) output.

     In the 1980s the preprocessor was a separate program.

     Read about the cpp preprocessor, and preprocessor and C preprocessor wikipages.

     You could even define ill-defined names like

     #define BAD @*?$ some crap $?-

     And even more scary you can define things which are syntactically incomplete like

     #define BADTASTE 2 +-

     and later code BADTASTE 3

     Actually, you want to use parenthesis when defining macros. If you have

     #define BADPROD(x,y) x*y-

     then BADPROD(2+3,4+5) is expanded to 2+3*4+5 which the compiler understands like 2+ (3*4) +5; you really want

     #define BETTERPROD(x,y) ((x)*(y))-

     So that BETTERPROD(2+3,4+5) is expanded to ((2+3)*(4+5))

     Avoid side-effects in macro arguments, e.g. BETTERPROD(j++,j--)

     In general, use macros with care and have them stay simple.

     Other Answers

     Answered Oct 15, 2013 · 3 votes

     #define STRING VALUE

     is just an instruction for the pre-processor to replace the STRING with VALUE afterwards the compiler will take control and will check the types

     Check all answers on Stack Overflow

     3/5

   • #define usage in C/C++

     Top Answer

     Answered Jun 07, 2010 · 11 votes

     You want to use a Variadic macro.

     In your case, I believe you want:

     #define scanf(...) fscanf(inf,__VA_ARGS__)-

     Check all answers on Stack Overflow

     4/5

   • #define in C

     In C programming, #define is a preprocessor directive that is used to define macros. The macros are the identifiers defined by #define which are replaced by their value before compilation. We can define constants and functions like macros using #define. The generics in C are also implemented using the #define preprocessor directive along with _Generic.

     Syntax of C #define

     The syntax of #define preprocessor directive in C is:

     For Defining Constants

     #define MACRO_NAME value

     For Defining Expressions

     #define MACRO_NAME (expression within brackets)

     For Defining Expression with Parameters

     Arguments passed in the macros can be used in the expression.

     #define MACRO_NAME(ARG1, ARG2,..) (expression within brackets)

     There are a few more ways using which we can define macros. To know more, refer to this article – Macros and its types in C

     Examples of C #define

     Example 1:

     In the below example, we have defined a macro ‘PI’ and assigned it a constant value which we can use later in the program to calculate the area of a circle.

     C

     // C Program to illustrate how to use #define to declare // constants #include <stdio.h>   Defining macros with constant...

     Check all answers on Geeksforgeeks

     5/5

   Show moreShow less

2. www.geeksforgeeks.org › c-define-preprocessor#define in C - GeeksforGeeks

   www.geeksforgeeks.org › c-define-preprocessor

   • Cached

   Jul 14, 2023 · Learn how to use #define preprocessor directive to define macros in C programming. See syntax, examples and important points of #define with constants, expressions and parameters.

3. www.techonthenet.com › c_language › constantsC Language: #define Directive (macro definition) - TechOnTheNet

   www.techonthenet.com › c_language › constants

   In the C Programming Language, the #define directive allows the definition of macros within your source code. These macro definitions allow constant values to be declared for use throughout your code. Macro definitions are not variables and cannot be changed by your program code like variables. You generally use this syntax when creating ...

4. www.freecodecamp.org › news › constants-in-cConstants in C Explained – How to Use #define and the const ...

   www.freecodecamp.org › news › constants-in-c

   • Cached

   Oct 26, 2021 · Learn how to use #define and const qualifier to define constants in C, which are variables that cannot be modified during execution. See examples, syntax, and differences between the two methods.

5. learn.microsoft.com › en-us › cpp#define directive (C/C++) | Microsoft Learn

   learn.microsoft.com › en-us › cpp

   • Cached

   Aug 2, 2021 · Learn how to use the #define directive to create macros, which are associations of identifiers or parameterized identifiers with token strings. See syntax, remarks, examples, and Microsoft-specific features of the #define directive.

6. www.cprogramming.com › preprocessor › define#define - C and C++ Syntax Reference - Cprogramming.com

   www.cprogramming.com › preprocessor › define

   • Cached

   Learn how to use #define to define constants and macros in C and C++. See examples, gotchas, and related tutorials on the c preprocessor.

7. codeforwin.org › c-programming › c-preprocessorC preprocessor directives - #include, #define, #undef and ...

   codeforwin.org › c-programming › c-preprocessor

   • Cached

   Nov 18, 2018 · Learn how to use #define to define macros, constants and expressions in C programming. Also, see how to use #include, #undef, #ifdef, #ifndef and other preprocessor directives.

8. People also ask

   What is the use of 'define define' in C?

   • Some common uses of "#define" include: Defining constants: The #define define C directive can be used to assign a constant value to a preprocessor macro, which can then be used throughout the program in place of the value.

   Define and Include in C

   www.prepbytes.com/blog/c-programming/define-and-include-in-c/

   See all results for this question

   What is the difference between include and define in C?

   • #include and #define are the preprocessor directives. #include is used to include the header files in a source code file. #define is used to define macros or constants in programs. Preprocessor directives in C are commands that are processed by the preprocessor before the source code is compiled.

   Define and Include in C

   www.prepbytes.com/blog/c-programming/define-and-include-in-c/

   See all results for this question

   How to define constants in C?

   • Let's get started. One of the common ways to define constants in C is to use the #define preprocessor directive, as shown below: In the above syntax: is a placeholder for the name of the constant. It's recommended that you name constants in the uppercase, as it helps differentiate them from other variables defined in the program.

   Constants in C Explained – How to Use #define and the const Qualifier

   www.freecodecamp.org/news/constants-in-c-explained-how-to-use-define-and-const-keyword/

   See all results for this question

   What is the difference between value> and define> in C?

   • VALUE> is a placeholder for the value that takes. #define is a preprocessor directive. Before the compilation of the program, the preprocessor replaces all occurrences of with . In C, the preprocessors process the source code ahead of compilation to produce the expanded source code. This is illustrated below.

   Constants in C Explained – How to Use #define and the const Qualifier

   www.freecodecamp.org/news/constants-in-c-explained-how-to-use-define-and-const-keyword/

   See all results for this question

9. www.prepbytes.com › blog › c-programmingDefine and Include in C

   www.prepbytes.com › blog › c-programming

   • Cached

   Jan 30, 2023 · Learn how to use #define and #include preprocessor directives in C to define macros, constants, and header files. See syntax, examples, and uses of these directives with explanations.