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int main() 
{
	int * p; 				// p is a pointer to int. 
	const int* q; 			// q is a pointer to const int.
	int const* r; 			// r is a pointer to const int.
	int * const s = nullptr; // s is a const pointer to int
 
	int obj ;
	int & t = obj ;			// t is a reference to int
	const int & u = obj ;	// u is a reference to const int	
	int const& v = obj ;    // v is a reference to const int
	int & const w = obj ;	// illegal
}

prog.cpp: In function ‘int main()’:
prog.cpp:12:14: error: ‘const’ qualifiers cannot be applied to ‘int&’
  int & const w = obj ; // illegal
              ^
prog.cpp:3:8: warning: unused variable ‘p’ [-Wunused-variable]
  int * p;     // p is a pointer to int. 
        ^
prog.cpp:4:13: warning: unused variable ‘q’ [-Wunused-variable]
  const int* q;    // q is a pointer to const int.
             ^
prog.cpp:5:13: warning: unused variable ‘r’ [-Wunused-variable]
  int const* r;    // r is a pointer to const int.
             ^
prog.cpp:6:14: warning: unused variable ‘s’ [-Wunused-variable]
  int * const s = nullptr; // s is a const pointer to int
              ^
prog.cpp:9:8: warning: unused variable ‘t’ [-Wunused-variable]
  int & t = obj ;   // t is a reference to int
        ^
prog.cpp:10:14: warning: unused variable ‘u’ [-Wunused-variable]
  const int & u = obj ; // u is a reference to const int 
              ^
prog.cpp:11:13: warning: unused variable ‘v’ [-Wunused-variable]
  int const& v = obj ;    // v is a reference to const int
             ^
prog.cpp:12:14: warning: unused variable ‘w’ [-Wunused-variable]
  int & const w = obj ; // illegal
              ^

Standard output is empty