Told you

c0bra@pc:~/Desktop/test$ cat test.cpp
#include <iostream>

using namespace std;

int main(int argc, char** argv)
{
	cout << 'abcd' << '\n';
}
c0bra@pc:~/Desktop/test$ c++ test.cpp
test.cpp:7:10: warning: multi-character character constant
c0bra@pc:~/Desktop/test$