Class definitions

scuzzo · #1 12-Dec-2008, 21:58

I have a complete file that compiles easily. I need to separate out the class and function prototypes into one file, the function definitions into another file and leave the main body in the original file. I can get it to work with just the header.h and main.cpp, but when I put the class function definitions into another file I can't figure out how to get that third file included.

WaltP · #2 12-Dec-2008, 23:23

#include "the-third-file"

davekw7x · #3 13-Dec-2008, 00:05

Quote:

Originally Posted by WaltP

#include "the-third-file"

I think that is a terrible thing to suggest, since, in my opinion, there is rarely a good reason to include a source file in another, and there are lots of situations where you do not want to (and, in fact, can not) include a source file in other files. I mean if you only had two source files and one header file, I guess there might not be any harm in #including one source file in the other, but it's just not the right way to learn this stuff.

The problem of linking together separate source files is a matter of how the project is being compiled.

If it is being compiled from a command line, and the compiler is GNU g++, for example, then a single file might be compiled by something like

Code:

g++ -Wall -W -pedantic testit.cpp -o testit

A command line to compile and link two source files together might look like

Code:

g++ -Wall -W -pedantic testit.cpp classdefs.cpp -o testit

In other words, you can simply put all of the source file names (not the header(s)) on the command line.

It works the same way with various other compilers, too.

If you are using a Microsoft command line compiler, cl.exe, then a single file would be compiled with something like:

Code:

cl testit.cpp /EHsc

And for two source files to be compiled and linked together you could have something like

Code:

cl testit.cpp classdefs.cpp  /EHsc

If you are compiling from an Integrated Development Environment like Visual Studio or Borland Builder, then you should learn how to add multiple files to the project so that they will all get linked together.

Regards,

Dave

zatora · #4 13-Dec-2008, 01:27

Quote:

Originally Posted by scuzzo

I have a complete file that compiles easily. I need to separate out the class and function prototypes into one file, the function definitions into another file and leave the main body in the original file. I can get it to work with just the header.h and main.cpp, but when I put the class function definitions into another file I can't figure out how to get that third file included.

If you are using visual studio this what you should do open an empty project
and name it .
then go to header file insert your code it should lokks like this

CPP / C++ / C Code:

class sample
{
private:
// here ur private  members;
public:
// usuaully ur default and parameters constructors
sample();
sample(dataType);
void print() const;
// these are just exples not ur actual code
};

now you go to the folder resources and create your cpp file, which will contain the actual code it should looks like that

CPP / C++ / C Code:

inculde<iostream>
include"sample.h"
using name space std;

sample::sample()
{// code the default constructor;}
sample::sample(dataType)
{//code the parameter constructor;}
void sample::print()const
{//code what you want to print for example;}

now one you are done you go to the third folder and create your main.cpp

CPP / C++ / C Code:

#include<iostream>
#include"sample.h"
using namespace std;
int main()
{
sample obj(dataType);
sample.print();
return 0;
}

press Ctrl+F5 to run it.

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Class definitions

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