compile error for simple code (could be compiler)

[markman]

Im compiling the following code using g++ on redhat 7.3:

//clim.cpp:
#include <iostream.h>
#include "client.h"
int main(int args, char* argv[])
{
	int retVal;
retVal=Client->load(args,argv[1]);
	cout << retVal << endl;
	return retVal;
}
//client.h
#include <ncurses.h>
#include <stdlib.h>

class clim
{
private:

public:
    long load(int args,char* argv);
};

clim* Client;
//client.cpp
#include "client.h"
#include <iostream.h>

long clim::load(int args, char* argv)
{
    cout << "load" << endl;
    return 20;
}

Now why doesnt that work?
When in CLi, I get an error "undefined reference to 'load'" and when in GUI, I get the error "undefined reference to 'main'
Both errors stem from an output file with a random filename, like cfkjd94..
Then collect2 says that ld returned a 1 exit status, whatever that means...