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#include <iostream>
using namespace std;
 
int main() {
	// your code goes here
	return 0;
}
 
class ITestA 
{
	virtual methodA() = 0;
}
 
class ITestB : public ITestA
{
	virtual methodB() = 0;
}
 
class CBaseA : public ITestA
{
	virtual void methodA() override;
}
 
class CBaseB : public CBaseA, public ITestA
{
    virtual void methodB() override;	
}
}

prog.cpp:11:22: error: ISO C++ forbids declaration of ‘methodA’ with no type [-fpermissive]
  virtual methodA() = 0;
                      ^
prog.cpp:12:1: error: expected ‘;’ after class definition
 }
 ^
prog.cpp:16:22: error: ISO C++ forbids declaration of ‘methodB’ with no type [-fpermissive]
  virtual methodB() = 0;
                      ^
prog.cpp:17:1: error: expected ‘;’ after class definition
 }
 ^
prog.cpp:21:15: error: conflicting return type specified for ‘virtual void CBaseA::methodA()’
  virtual void methodA() override;
               ^~~~~~~
prog.cpp:11:10: error:   overriding ‘virtual int ITestA::methodA()’
  virtual methodA() = 0;
          ^~~~~~~
prog.cpp:22:1: error: expected ‘;’ after class definition
 }
 ^
prog.cpp:26:18: error: ‘virtual void CBaseB::methodB()’ marked ‘override’, but does not override
     virtual void methodB() override;
                  ^~~~~~~
prog.cpp:24:7: warning: direct base ‘ITestA’ inaccessible in ‘CBaseB’ due to ambiguity
 class CBaseB : public CBaseA, public ITestA
       ^~~~~~
prog.cpp:27:1: error: expected ‘;’ after class definition
 }
 ^
prog.cpp:28:1: error: expected declaration before ‘}’ token
 }
 ^

Standard output is empty