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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.

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     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.

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     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

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     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__)-

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     4/5

   • #define in C: what is happening

     Top Answer

     Answered Jun 20, 2020 · 4 votes

     calcCylinderArea(3.0,5.0+1)-

     (calcCircleArea(3.0)*5.0+1)-

     notice that it is not (5.0+1). Problem begins here.

     ((PI*(3.0)*(3.0))*5.0+1)-

     ((3.1*(3.0)*(3.0))*5.0+1)-

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     5/5

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

   www.geeksforgeeks.org › c-define-preprocessor

   • Cached

   Jul 14, 2023 · 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.

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

   www.techonthenet.com › c_language › constants

   This C tutorial explains how to use the #define preprocessor directive in the C language. In the C Programming Language, the #define directive allows the definition of macros within your source code.

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

   learn.microsoft.com › en-us › cpp

   • Cached

   Aug 2, 2021 · The #define creates a macro, which is the association of an identifier or parameterized identifier with a token string. After the macro is defined, the compiler can substitute the token string for each occurrence of the identifier in the source file.

5. www.freecodecamp.org › news › constants-in-c-explained-how-to-use-define-and-constConstants in C Explained – How to Use #define and the const...

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

   • Cached

   Oct 26, 2021 · You can define constants in C in a few different ways. In this tutorial, you'll learn how to use #define and the const qualifier to define them. Let's get started. How to Use #define to Define Constants in C. One of the common ways to define constants in C is to use the #define preprocessor directive, as shown below: #define <VAR_NAME> <VALUE>

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

   www.cprogramming.com › reference › preprocessor

   • Cached

   #define The #define directive takes two forms: defining a constant and creating a macro. Defining a constant #define token [value] When defining a constant, you may optionally elect not to provide a value for that constant. In this case, the token will be replaced with blank text, but will be "defined" for the purposes of #ifdef and ifndef. If ...

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

   www.prepbytes.com › blog › c-programming

   • Cached

   Jan 30, 2023 · A constant value or expression that may be used across the whole program is declared using the #define keyword in c. A header file’s contents are included in our C program using the #include statement.

8. www.programiz.com › c-programming › c-preprocessor-macrosC Preprocessor and Macros - Programiz

   www.programiz.com › c-programming › c-preprocessor-macros

   • Cached

   The C preprocessor is a macro preprocessor (allows you to define macros) that transforms your program before it is compiled. In this tutorial, you will be introduced to c preprocessors, and you will learn to use #include, #define and conditional compilation with the help of examples.

9. en.wikibooks.org › wiki › C_ProgrammingC Programming/Statements - Wikibooks, open books for an open...

   en.wikibooks.org › wiki › C_Programming

   • Cached

   Jan 18, 2023 · A statement is a command given to the computer that instructs the computer to take a specific action, such as display to the screen, or collect input. A computer program is made up of a series of statements. Contents. 1 Labeled Statements. 2 Compound Statements. 3 Expression Statements. 4 Selection Statements. 5 Iteration Statements.

10. codeforwin.org › c-programming › c-preprocessor-directives-include-define-undefC preprocessor directives – #include, #define, #undef ... -...

    codeforwin.org › c-programming › c-preprocessor-directives-include-define-undef

    • Cached

    Nov 18, 2018 · A C preprocessor is a statement substitution in C language. It instructs the C compiler to do some specific pre-processing before the compilation process.

11. www.youtube.com › watchC Programming #14: #define - YouTube

    www.youtube.com › watch

    • Cached

    Apr 3, 2020 · C Programming #14: #define - YouTube. codedamn. 406K subscribers. 54. 4.5K views 3 years ago C Programming Tutorials. Let's learn what #define preprocessor is in C and how to work with...