Multiple C++ Files

If I had two source files main_1.cpp and main_2.cpp would I be able to call functions defined in main_1 inside of main_2 or why would I use two I read something somewhere its better orgination but I'm not sure exactly.

you sure can...

just remember that you can only have one function named main..
check out this sample.....

//-------------------------
//main1.h

#ifndef MAIN1_H
#define MAIN1_H

int multiply(int x, int y);
int addex(int x, int y);

#endif
////end of main1

//--------------------------
//main1.cpp

#include "main1.h"
#include "main2.h"

int multiply(int x, int y)
{
return x * y;
}

int addex( int x, int y)
{
return add( x, y);
}

//-------------------------main2.h
#ifndef MAIN2_H
#define MAIN2_H

int add(int x, int y);

#endif
/////end of main2




//---------------------------
//main2.cpp
#include "main2.h"

int add(int x, int y)
{
return x + y;

}