My c++ header in eclipse dosen't work -

i made simple header in have function adds 2 ints compiler doesn't recognize after link header project , include it:
in alx.h:

#ifndef alx_h_ #define alx_h_ #include <iostream> int add(int a,int b);    #endif /* alx_h_ */ 

in alx.cpp:

#include <iostream> #include "alx.h" using namespace std;  int add(int a,int b) {     return a+b; } 

in test.cpp:

#include <iostream> #include "alx.h" using namespace std;  int main() {     int numb;     numb=add(15,5);     cout << numb;     return 0; } 

here properties of test : http://imgur.com/a/j5mxe