Compilare: main.cpp: In function 'bool factor()': main.cpp:26:19: warning: array subscript has type 'char' [-Wchar-subscripts] 26 | nr = val[s[ind]]; | ~~~~~^ main.cpp: In function 'int main()': main.cpp:104:9: warning: array subscript has type 'char' [-Wchar-subscripts] 104 | val[ch] = !val[ch]; | ^~ main.cpp:104:20: warning: array subscript has type 'char' [-Wchar-subscripts] 104 | val[ch] = !val[ch]; | ^~ main.cpp:60:13: warning: unused variable 't' [-Wunused-variable] 60 | int n, i, t; | ^ main.cpp: In function 'bool or_operation()': main.cpp:15:8: warning: 'nr' may be used uninitialized in this function [-Wmaybe-uninitialized] 15 | bool nr; | ^~ main.cpp: In function 'bool factor()': main.cpp:31:10: warning: 'nr' may be used uninitialized in this function [-Wmaybe-uninitialized] 31 | return nr; | ^~ main.cpp: In function 'bool and_operation()': main.cpp:15:8: warning: 'nr' may be used uninitialized in this function [-Wmaybe-uninitialized] 15 | bool nr; | ^~