How to define header files for vscode

How to define header files using Visual Studio Code? Create a header file and declare symbols in the header file using the .h or .hpp suffix name (such as classes, functions, variables) and use the #include directive to include the header file in the source file. The header file will be included and the declared symbols are available.

How to define header files using Visual Studio Code

Step 1: Create the header file

• Right-click in the project directory and select New > File.
• Name the file. The suffix is ​​usually .h or .hpp.

Step 2: Define the header file

• Declare classes, functions, variables, or other symbols that need to be used in multiple source files in the header file.
• Use #ifndef and #define directives to prevent header files from being included multiple times.

Step 3: Include header files in the source file

• In a source file that requires the symbols in the header file, use the #include directive to include the header file.
• For example: #include "my_header.h"

Step 4: Compile the program

• In the terminal or command prompt, navigate to the project directory.
• Compile the program using compiler commands such as gcc or clang .

Example

The following example shows how to define a function in a header file named my_functions.h :

 <code class="cpp">// my_functions.h #ifndef MY_FUNCTIONS_H #define MY_FUNCTIONS_H void my_function(int x, int y); #endif</code>

In the source file named main.cpp , include the header file and use the function:

 <code class="cpp">// main.cpp #include "my_functions.h" int main() { my_function(10, 20); return 0; }</code>

When the program is compiled, the header file my_functions.h will be included in main.cpp and the function my_function will be available.

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