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A Process to Create Custom Header File in C The header file name must have a . h file extension. In this example, I have named swap. h header file. Instead of writing <swap. h> use this terminology swap. h to include a custom header file. Both files swap. h and main. c must be in the same folder.

Header File Structure Header files should always start with an #ifndef statement. ... If the on line 1 has not been defined, we need to define it. Any necessary #include statements that are required can be added in the header file. You can define any macros required by your application with a #define.

Header files contain definitions of function and data types in C++; these header files are imported into any C++ program using the preprocessor directive #include. The preprocessor directive tells the compiler to process these files before compilation.

The GNU C Library header files have been written in such a way that it doesn't matter if a header file is accidentally included more than once; including a header file a second time has no effect. Likewise, if your program needs to include multiple header files, the order in which they are included doesn't matter.

A Process to Create Custom Header File in C The header file name must have a . h file extension. In this example, I have named swap. h header file. Instead of writing <swap. h> use this terminology swap. h to include a custom header file. Both files swap. h and main. c must be in the same folder.

Header File Structure Header files should always start with an #ifndef statement. ... If the on line 1 has not been defined, we need to define it. Any necessary #include statements that are required can be added in the header file. You can define any macros required by your application with a #define.

Header files contain definitions of function and data types in C++; these header files are imported into any C++ program using the preprocessor directive #include. The preprocessor directive tells the compiler to process these files before compilation.