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1. Top results related to define variable in c language

   • #define vs #undef in C language

     In this article, we will discuss the difference between #define and #undef pre-processor in C language.

     What are Pre-Processor Directives?

     • Pre-processor is a program that performs before the compilation.
     • It only notices the # started statement.
     • # is called preprocessor directive.
     • Each preprocessing directive must be on its own line.
     • The word after # is called the preprocessor command.

     #define

     The #define directive defines an identifier and a character sequence (a set of characters) that will be substituted for the identifier each time it is encountered in the source file.

     Syntax

     #define macro-name char-sequence

     The identifier is referred to as a macro name and the replacement process is called macro expansion.

     For example,

     #define PI 3.14

     Here, PI is the macro name and 3.14 is the char-sequence.

     Examples of #define Directive

     Example 1: Below is the C program illustrating the use of #define.

     C

     C program illustrating the...

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   • Variable Addition in C Language

     Top Answer

     Answered Apr 10, 2010 · 6 votes

     Your error is: -5 in two's complement is not 10000101. In 32-bit it is: 11111111111111111111111111111011

     6, is:

     00000000000000000000000000000110

     The sum is:

     11111111111111111111111111111011+ 00000000000000000000000000000110 -------------------------------- 00000000000000000000000000000001

     I recommend you read this Wikipedia page about signed number representation. Modern CPUs use two's complement.

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   • define static string variable in c++ class

     Top Answer

     Answered Feb 29, 2012 · 7 votes

     Why is this possible for an int variable: [..] but for a string variable I need to do it this way?

     Just because. Actually you can still make the string const but, yes, you have to define it outside of the class definition. You can only do in-place initialisation of static members when they are const and integral (or "of literal type").

     (In C++11 you can even do it for non-static non-const members when they are of literal type.)

     I would like that for every object of class foo there were just one instance of foo::string, representing a const value that should never change. Is there another way to solve this problem?

     A static const std::string, as you might expect.

     // C++03struct T { static const std::string foo;};const std::string T::foo = "lol";

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   • In C language, can I access local variable of main function in another function through stack pointer?

     Top Answer

     Answered Jan 20, 2020 · 6 votes

     You can pass pointer to a to your function. Pointers to local variables are valid as long as corresponding local variable exists. So

     #include <stdio.h>-void func(int *ptr);-main(){ int a = 10; // Pass pointer to a func(&a); printf("%d\n", a); // Prints 12}// function accepts pointer to variable of type intvoid func(int *ptr){ // update value behind the pointer *ptr = 12;}

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   • define the length of an array with a variable in c++/c

     Top Answer

     Answered Mar 26, 2012 · 7 votes

     If You are using a C++ compiler it works because most of the C++ compilers provide a compiler extension that supports Variable Length arguments(VLA).

     If You are using a C compiler it works because the standard allows it.

     In C++, VLA are not allowed by the C++ Standard, so any usage of it through compiler extensions will make your code non portable. C++ provides std::vector or std::array(C++11) which satisfy all the requirements using variable length array or c-style arrays resp and you should use them.

     Note that,since C99 standard, VLA's are allowed in C.

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2. www.geeksforgeeks.org › variables-in-cC Variables - GeeksforGeeks

   www.geeksforgeeks.org › variables-in-c

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   5 days ago · A variable in C language is the name associated with some memory location to store data of different types. There are many types of variables in C depending on the scope, storage class, lifetime, type of data they store, etc.

   • Video Duration: 6 min

3. www.w3schools.com › c › c_variablesC Variables - W3Schools

   www.w3schools.com › c › c_variables

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   Variables are containers for storing data values, like numbers and characters. In C, there are different types of variables (defined with different keywords), for example: int - stores integers (whole numbers), without decimals, such as 123 or -123.

   Usage example

   typevariableName=value;

   See more on w3schools

4. www.tutorialspoint.com › cprogramming › c_variablesC - Variables - Online Tutorials Library

   www.tutorialspoint.com › cprogramming › c_variables

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   Variable Definition in C. A variable definition tells the compiler where and how much storage to create for the variable. A variable definition specifies a data type and contains a list of one or more variables of that type as follows −. type variable_list;

5. www.programiz.com › c-programming › c-variablesC Variables, Constants and Literals - Programiz

   www.programiz.com › c-programming › c-variables

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   In this tutorial, you will learn about variables and rules for naming a variable. You will also learn about different literals in C programming and how to create constants with the help of examples.

6. en.wikibooks.org › wiki › C_ProgrammingC Programming/Variables - Wikibooks, open books for an open world

   en.wikibooks.org › wiki › C_Programming

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   Jul 23, 2023 · Like most programming languages, C uses and processes variables. In C, variables are human-readable names for the computer's memory addresses used by a running program.

7. www.gnu.org › software › c-intro-and-refVariables (GNU C Language Manual)

   www.gnu.org › software › c-intro-and-ref

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   variable. Variables can be declared anywhere within a block or file. versions of C required that all variable declarations within a block. occur before any statements.) Variables declared within a function or block are localto. it. This means that the variable name is visible only until the end.

8. People also ask

   What is a variable in C?

   • A variable in C is a memory location with some name that helps store some form of data and retrieves it when required. We can store different types of data in the variable and reuse the same variable for storing some other data any number of times.

   C Variables - GeeksforGeeks

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   What is a variable in programming?

   • In programming, a variable is a container (storage area) to hold data. To indicate the storage area, each variable should be given a unique name ( identifier ). Variable names are just the symbolic representation of a memory location. For example: Here, age is a variable of int type and we have assigned an integer value 25 to it.

   C Variables, Constants and Literals - Programiz

   www.programiz.com/c-programming/c-variables-constants

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   What is variable declaration in C?

   • Variable declaration in C tells the compiler about the existence of the variable with the given name and data type.When the variable is declared, an entry in symbol table is created and memory will be allocated at the time of initialization of the variable. 2. C Variable Definition

   C Variables - GeeksforGeeks

   www.geeksforgeeks.org/variables-in-c/

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   What are the different types of variables in C?

   • There are many types of variables in C depending on the scope, storage class, lifetime, type of data they store, etc. A variable is the basic building block of a C program that can be used in expressions as a substitute in place of the value it stores. What is a variable in C?

   C Variables - GeeksforGeeks

   www.geeksforgeeks.org/variables-in-c/

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9. www.prepbytes.com › blog › c-programmingVariables in C: Types, Syntax and Examples

   www.prepbytes.com › blog › c-programming

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   Mar 30, 2023 · What is a Variable in C? Variables in C are nothing but a name we give to a memory location that is used to store data or value. We can understand it as a container that stores the data. Variables in c can store different types of data like integers, characters, floating point numbers, strings, etc.