Multi Source Files

[Ali93]

Hi,,

I'm having a problem to split my code to multi source files

I wrote a program using only one .cpp file (main) and 4 header files
toBase.h, toDec.h, valid.h, typ.h)

Now my teacher ask me to split the code to multi source files (At least 4 c++ source files)

Help me please ?

Thanks

[Stewbond]

The exact procedure depends on your compiler/IDE.

Based on what you have said, I assume that you've put entire functions/classes in the header files. What you need to do is create a .cpp file for each header. Put the definitions of each function/class in the .cpp files but keep a prototype/declaration for that function in the header.

Example, change this:

// Someheader.h
void SomeFunction()
{
   // Some implementation
}

into this:

// Someheader.h
void SomeFunction();

// Somefunction.cpp
void SomeFunction()
{
   // Some implementation
}

Then you need to add the new source files to your project/makefile. That depends on your compiler.

[keskiverto]

Logical grouping. For example, implementation for one class and its related non-members is logical to have in one place.

In your case I can only guess that you have four functions and you have declarations for them in header files. If so, you could move implementation of each function to separate source file.

[Ali93]

Stewbond
I will use shell compiler in UNIX system to compile my code

If i did what you said i can't run the program unless i add makefile right !


keskiverto
Yes you are right, I will try to separate source files like you said and Stewbond

Thanks for reply

[keskiverto]

You can compile without 'make', but make makes it easier.

When you type
g++ -o foo foo.cpp
the g++ does two things:
1. generate object file foo.o from foo.cpp
2. link foo.o an system libraries into binary foo.

If you had two sources, foo.cpp and bar.cpp, you could do:
1. g++ -c foo.cpp
2. g++ -c bar.cpp
3. g++ -o foo foo.o bar.o

Or write a Makefile

foo: foo.o bar.o
        g++ -o $@ $^

and just run 'make'.

GNU make has several builtin rules. info make

[Ali93]

When i tried to separate source files like you said, I got many errors.

Here is one of my header files and the main,, could you show me how can i do it please .

//typ.h

int get_type(const string num)// Return the type of the input value
{
	if(num[0]=='B') return 0; // The value is Binary number
	else
		if(num[0]=='0') 
		{
			if(num[1]=='x' || num[1]=='X')
				return 1;	// The value is Hexadecimal number
			else
				return 2;		// The value is Octal number
		}
		
		return 3; // The value is Decimal number
}

//main.cpp


#include"toBase.h"
#include"toDec.h"
#include"valid.h"
#include"typ.h"


int main()
{
     // Main Code

}

The new Source Code

//check.cpp

[Plover]

Move the definition of the get_type function from "typ.h" into "typ.cpp" and compile it using
g++ -c typ.cpp
In "typ.h" leave just the declaration of the get_type function ie:
int get_type(const string num);
Do likewise with any other function definitions you have.
Don't forget to include the appropriate header files. For example, "typ.h" will need
#include <string>

[Ali93]

THANK YOU ALL

Finally i got the Idea ^_^

I have errors because when I tried to change only one function to source code, I compile the program to see if my changes in the function didn't generate errors .

After your reply " Plover ",,
I convert all the functions then i compile it.

Now it's working :)