Can we combine C and C++ code?

Answer : 

Yes, we can combine C and C++ source code. You need to use extern “C”  for the same. Let see an example,

// C++ code
 extern "C" void foo(int); // one way, foo is C function
 extern "C" {    // another way, fun and test are C functions
     int fun(double);
     double test();
 };