Question

I had made 2 class in my project. I want to use a function from 1st class to the 2nd class the problem is I can’t instantiate the 1st class to the 2nd class. By the way both classes were declared in different headers.

here is a sample code:

header 1:

class 1stclass{
   public:

   2ndclass *class2;
   void function1(QString parameter1)
   {
       QString str1;
       list = class2->function2(parameter1);
   }
};

header 2:

class 2ndclass{
   public:

   QString function2(QString parameter2)
   {
       QString str2 = parameter2 + "hello"; 
       return str2;
   }
};

I want to use the function in function 2 but it gives me an error.
here is the error message:

1. ISO C++ forbids declaration of ‘2ndclass’ with no type;
2. expected ‘;’ before ‘*’ token;
3. ‘class2’ was not declared in this scope;

Answer 1

Class names aren’t allowed to start with a number in C++.

Class1 and Class2 are valid names though.