MIx C & C++

If you are including a C header file that isn't provided by the system, you may need to wrap the #include line in an extern "C" { /*...*/ } construct. This tells the C++ compiler that the functions declared in the header file are C functions.

// This is C++ code
extern "C" {
// Get declaration for f(int i, char c, float x)
#include "my-C-code.h"
}
int main()
{
f(7, 'x', 3.14); // Note: nothing unusual in the call
...
}