C calls the C ++ Method

I read other people's articles, sorted them out, and pasted the sample code.

This is a. h

#ifdef __cplusplusextern "C"{#endifint printf_cpp();#ifdef __cplusplus}#endif

This is a. cpp

#include <iostream>using namespace std;extern "C"{int printf_cpp(void){        cout<<"c++ printf\n"<<endl;}}

Compile and generate the. o file

g++ -c a.cpp

Call in C: // main. c

#include "a.h"int main(int argc, char *argv[]){        printf_cpp();        return 0;}

During Compilation: GCC main. c a. O-o a. Out-lstdc ++

Note that-lstdc ++

In this way, the correct results can be output.

You can also make it into a library: Ar rcs liba. a A. O

Then compile: GCC main. C-I.-L.-La-lstdc ++

OK