How do you call C functions from C++?

• 
  
  Compile the C code like this:
  
  gcc -c -o somecode.o somecode.c
  
  Then the C++ code like this:
  
  g++ -c -o othercode.o othercode.cpp
  
  Then link them together, with the C++ linker:
  
  g++ -o yourprogram somecode.o othercode.o
  
  You also have to tell the C++ compiler a C header is coming when you include the declaration for the C function. So othercode.cpp begins with:
  
  extern "C" {
  #include "somecode.h"
  }
  
  somecode.hshould contain something like:
  
  #ifndef SOMECODE_H_
  #define SOMECODE_H_
  
  void foo();
  
  #endif
  
  
• 10 years agoHelpfull: Yes(1) No(7)
• /*this is what the C++ code would look like
  for the declaration of the foo function, which
  is defined somewhere else in C code: */
  
  extern "C" void foo( );
  
  And then to call the function in the C++ code, it would look like this:
  
  //the declaration:
  extern "C" void foo();
  
  void main()
  {
  // the function call:
  foo( );
  }
• 9 years agoHelpfull: Yes(1) No(1)
• coding language
• 9 years agoHelpfull: Yes(1) No(0)
• member functions
  
• 10 years agoHelpfull: Yes(0) No(0)
• yes this correct
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