c
  1. c-data-segments
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C Data Segments

Syntax

C Data Segments are declared using the following syntax:

<storage class> <data type> <variable name> = <value>;

Example

#include <stdio.h>
int global = 10;             // Global variable
 
int main()
{
    int local = 20;          // Local variable
 
    printf("Global variable: %d\n", global);
    printf("Local variable: %d\n", local);
 
    return 0;
}

Output

Output of the above program will be:

Global variable: 10
Local variable: 20

Explanation

C Data Segments contain two types of data: Global or Static Variables and Local Variables. Global Variables are declared outside all functions and can be accessed throughout the program. Local Variables are declared inside a function and can only be accessed within that function.

Use

C Data Segments are used to store data that can be accessed throughout the program. They are often used to store constants, configuration settings, and other data that needs to be accessed globally. Global Variables are often used for communication between functions, while Local Variables are used for temporary storage within a single function.

Important Points

  • Global Variables are declared outside all functions and can be accessed throughout the program.
  • Local Variables are declared inside a function and can only be accessed within that function.
  • Static Variables are a type of Global Variable that are only accessible within the function in which they are declared.
  • Local Variables take precedence over Global Variables with the same name.
  • Uninitialized Global and Static Variables are automatically initialized to zero.

Summary

C Data Segments provide a way to store global and local data in C programs. They are an essential part of C programming and are used to store constants, configuration settings, and other data that needs to be accessed throughout the program. Understanding the syntax and use cases for these data segments is essential for writing efficient and effective C programs.

ExpressionsEnum
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