Compilare: main.cpp: In function 'int main()': main.cpp:12:12: warning: statement has no effect [-Wunused-value] 12 | in >> in; | ~~~^~~~~ main.cpp:13:9: warning: 'in' may be used uninitialized [-Wmaybe-uninitialized] 13 | switch (in){ | ^~~~~~ main.cpp:9:10: note: 'in' was declared here 9 | char in; | ^~