🔧Connect multiple C++ Files
Here is how to connect multiple c++ file:
Here is a code example using multiple files:
Now, let's break down how these files are linked:
Header files and source files:
math_operations.h
is a header file containing function declarations and an external variable declaration.math_operations.cpp
is a source file with the implementations of the functions declared in the header.main.cpp
is the main source file that uses the functions defined inmath_operations
.
#include directive:
math_operations.cpp
includesmath_operations.h
to ensure the function implementations match the declarations.main.cpp
includesmath_operations.h
to access the function declarations and the external variable.
External linkage:
globalValue
is declared withextern
in the header, making it accessible across multiple files.It's defined in
math_operations.cpp
and can be used inmain.cpp
.
Function declarations and definitions:
Functions are declared in
math_operations.h
and defined inmath_operations.cpp
.This allows
main.cpp
to use these functions by including only the header file.
To compile and link these files, you would use a command like:
This compiles both source files and links them together into an executable named "program".
The #ifndef
, #define
, and #endif
in the header file create an "include guard" to prevent multiple inclusions of the same header, which can cause compilation errors.
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