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#include <iostream>
using namespace std;
#define mc_string(x) (#x)
#define mc_null(x) (std::cout<<mc_string(x)<<" has value"<<10;)
 
int main() {
	mc_null("abc");
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:4:62: error: expected ‘)’ before ‘;’ token
 #define mc_null(x) (std::cout<<mc_string(x)<<" has value"<<10;)
                                                              ^
prog.cpp:7:2: note: in expansion of macro ‘mc_null’
  mc_null("abc");
  ^~~~~~~
prog.cpp:4:63: error: expected primary-expression before ‘)’ token
 #define mc_null(x) (std::cout<<mc_string(x)<<" has value"<<10;)
                                                               ^
prog.cpp:7:2: note: in expansion of macro ‘mc_null’
  mc_null("abc");
  ^~~~~~~

Standard output is empty