Using multiple cpp files in c program

Question

I recently moved from Java for C   but now when I am writing my application I m not interested in writing everything of the code in the main function I want in main function to call another function but this other function is in another  cpp file   Let me explain better if you wouldn t understand  I have one file  main cpp inside it I have main function   I have the second file  second cpp inside I have a function called second   I want to call this function called second   from my main function    Any help

User · Answer

You should have header files   h  that contain the function s declaration  then a corresponding  cpp file that contains the definition  You then include the header file everywhere you need it  Note that the  cpp file that contains the definitions also needs to include  it s corresponding  header file      main cpp  include  second h  int main          secondFunction          second h void secondFunction        second cpp  include  second h  void secondFunction           do stuff

User · Answer

You can simply place a forward declaration of your second   function in your main cpp above main    If your second cpp has more than one function and you want all of it in main    put all the forward declarations of your functions in second cpp into a header file and  include it in main cpp   Like this-  Second h   void second    int third    double fourth      main cpp    include  lt iostream gt   include  second h  int main                     return 0      second cpp   void second                  int third                    return foo     double fourth                    return f      Note that  it is not necessary to  include  second h  in second cpp  All your compiler need is forward declarations and your linker will do the job of searching the definitions of those declarations in the other files

User · Answer

In C C   you have header files    H   There you declare your functions classes  So for example you will have to  include  second h  to your main cpp file   In second h you just declare like this void yourFunction    In second cpp you implement it like   void yourFunction         doSomethng         Don t forget to  include  second h  also in the beginning of second cpp  Hope this helps

User · Answer

You must use a tool called a  header   In a header you declare the function that you want to use  Then you include it in both files  A header is a separate file included using the  include directive  Then you may call the other function   other h  void MyFunc      main cpp   include  other h  int main         MyFunc        other cpp   include  other h   include  lt iostream gt  void MyFunc         std  cout  lt  lt   Ohai from another  cpp file        std  cin get

[c++] Using multiple .cpp files in c++ program?

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