title: How to use C code in C++
body: <p>Just a small question:
  Can C++ use C header files in a program?</p>
  
  <p>This might be a weird question, basically I need to use the source code from other program (made in C language) in a C++ one. Is there any difference between both header files in general? Maybe if I change some libraries...
  I hope you can help me.</p>