Name Mangling and Extern "C" in C++ Concept

We know that the C++ programming language is robust and is a widely used programming language in the industry for gaming console development. It supports the overloading functionality, which means a with different parameters, we can have functions defined with the same name where the compiler will be capable enough to map them into separate entities.

In contrast, the parameters are other, and the function names are the same. Here, we use the name mangling method to map the functions with the same name and make the compiler understand them as different objects. This method adds additional information to the tasks, which will differ. Thus, the local or the online compiler will run them without confusion.

C++ Code

// here we are writing down the tiny code snippet to demonstrate the 
// concept of Name Mangling and extern "C" in C++, function overloading in C++
// programming language and name mangling concept
int v(void) { return 1; }
// this is a sample integer variable declared with a return type 0.
int v(int) { return 0; }
// A simple void function holding integer variables i and j.
void hh(void) { int i = v(), j = v(0); }


// end of the Name Mangling and extern "C" in C++ concept partial 
// demonstration

Output:

G ++ / t m p/F mT y bF gU rL. cpp
/usr/bin/ld: cannot open output file a.out: Permission denied
collect2: error: ld returned one exit status

C++ Code

// here we are writing down the tiny code snippet to demonstrate the 
// concept of Name Mangling and extern "C" in C++, function overloading in C++
// programming language and name mangling concept


// this is a sample integer variable declared with a return type 1.
int __f_v(void) { return 1; }
 
 
// this is a sample integer variable declared with a return type 1.
int __f_i(int) { return 0; }


// A simple void function holding integer variables i and j. 
void __g_v(void) { int i = __f_v(), j = __f_i(0); }

// end of the Name Mangling and extern "C" in C++ concept partial 
// demonstration

Output:

G ++ / t m p/F mT y bF gU rL. cpp
/usr/bin/ld: cannot open output file a.out: Permission denied
collect2: error: ld returned 1 exit status

C++ Code

// here we are writing down the tiny code snippet to demonstrate the 
// concept of Name Mangling and extern "C" in C++, function overloading in C++
// programming language and name mangling concept

int printf(const char* format, ...);

// the main driver code functionality starts from here 
int main()
{
    // A simple printf function holding the display statement javaTpoint.com
	printf("javaTpoint.com");
	return 0;
}

// end of the Name Mangling and extern "C" in C++ concept partial 
// demonstration

Output:

g++ /tmp/FmTybFgUrL.cpp
/usr/bin/ld: cannot open output file a.out: Permission denied
collect2: error: ld returned 1 exit status

Extern "C" in C++ Programming Language

C++ Code

// here we are writing down the tiny code snippet to demonstrate the 
// concept of Name Mangling and extern "C" in C++, function overloading in C++
// programming language and name mangling concept

extern "C" {
int printf(const char* format, ...);
}

// the main driver code functionality starts from here 
int main()
{
    // A simple printf function holding the display statement javaTpoint.com
	printf("javaTpoint.com");
	return 0;
}

// end of the Name Mangling and extern "C" in C++ concept partial 
// demonstration

Output:

G ++ / t m p/F mT y bF gU rL. cpp
javaTpoint.com

C style Declarations in stdio.h, string.h Files

C++ Code

// here we are writing down the tiny code snippet to demonstrate the 
// concept of Name Mangling and extern "C" in C++, function overloading in C++
// programming language and name mangling concept
#ifdef __cplusplus
extern "C" {
#endif
// Declarations of this file
// this below small code helps us with declarations of the file
#ifdef __cplusplus
}
#endif
// end of the Name Mangling and extern "C" in C++ concept partial 
// demonstration

Output:

G ++ / t m p/F mT y bF gU rL. cpp
/usr/bin/ld: cannot open output file a.out: Permission denied
collect2: error: ld returned 1 exit status

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