I have 2 classes.
Class A { void printMe(); } cpp File:
A::printMe(){ cout<<"yay"; } Class B { void DoSomething(); } cpp File
B::DoSomething(){ A::printMe(); } How do I make an object of Class A in Class B and use it for the function printMe();
References, but the answers are not accepted and they did not work for me HERE
Assuming you want to call the printMe() member function on an object of class A:
B::DoSomething() { A a; a.printMe(); } However you also need to declare the printMe() function to be public:
class A { public: void printeMe(); } 
class A before you can create an object or call a member function. If it's in a header file, then include that. If you're just writing a single source file, then make sure A comes before B. This should all be covered by your introductory book.First you'll need to correct the many syntax errors:
// A.h class A { // not Class public: // otherwise you can only call the function from A void printMe(); }; // missing ; // B.h class B { // not Class public: // probably needed void DoSomething(); }; // missing ; // A.cpp #include "A.h" // class definition is needed #include <iostream> // I/O library is needed (cout) void A::printMe() { // missing return type std::cout << "yay\n"; // missing namespace qualifier } // B.cpp #include "A.h" // class definitions are needed #include "B.h" void B::DoSomething() { // missing return type A a; // make an object of type A a.printMe(); // call member function } 