Inheriting One Class from Multiple in C++

#include<iostream.h>
#include<conio.h>
class cls
{
public:
void fun()
{
cout<<"This is fun() function of class cls"<<endl;
}
};
class cls2
{
public:
void fun2()
{
cout<<"This is fun2() function of class cls2"<<endl;
}
};  //class 'cls3' Inheriting from class 'cls' and 'cls2'.
class cls3:public cls, public cls2
{
public:
void fun3()
{
cout<<"This is fun3() function of class cls3"<<endl;
}
};
void main()
{
cls3 obj; //'obj' is object of class 'cls3'.
obj.fun2();
obj.fun3();
obj.fun();
getch();
}

#include<iostream.h>
#include<conio.h>
class cls
{
public:
void fun()
{
cout<<"This is fun() function of class cls"<<endl;
}
};
class cls2
{
public:
void fun2()
{
cout<<"This is fun2() function of class cls2"<<endl;
}
};
class cls3
{
public:
void fun3()
{
cout<<"This is fun3() function of class cls3"<<endl;
}
}; //class 'cls4' inheriting from class 'cls2, cls3 and cls'.
class cls4: public cls2, public cls3, public cls
{
public:
void fun4()
{
cout<<"This is fun4() function fo class cls4"<<endl;
}
};
class cls5: public cls4 //class 'cls5' inheriting from class 'cls4'.
{
public:
void fun5()
{
cout<<"This is fun5() function of class cls5"<<endl;
}
};
void main()
{
cls5 obj; //'obj' is object of class 'cls5'.
obj.fun(); //and calling functions.
obj.fun4();
obj.fun2();
obj.fun5();
obj.fun3();
getch();
}