Compilare: main.cpp: In function 'void join(int, int)': main.cpp:27:17: warning: left operand of comma operator has no effect [-Wunused-value] 27 | switch (xD, yD); | ^~ main.cpp: In function 'int main()': main.cpp:39:9: warning: unused variable 'x' [-Wunused-variable] 39 | int x, y; | ^ main.cpp:39:12: warning: unused variable 'y' [-Wunused-variable] 39 | int x, y; | ^