Compilare: main.cpp: In function 'int factor()': main.cpp:164:22: warning: array subscript has type 'char' [-Wchar-subscripts] 164 | ret = F[s[i++]]; | ~~~~~^ main.cpp: In function 'int main()': main.cpp:194:11: warning: array subscript has type 'char' [-Wchar-subscripts] 194 | F[c] = 1 - F[c]; | ^ main.cpp:194:22: warning: array subscript has type 'char' [-Wchar-subscripts] 194 | F[c] = 1 - F[c]; | ^ main.cpp: In function 'int factor()': main.cpp:176:12: warning: 'ret' may be used uninitialized [-Wmaybe-uninitialized] 176 | return ret; | ^~~ main.cpp:150:9: note: 'ret' was declared here 150 | int ret; | ^~~ In function 'int not_op()', inlined from 'int and_op()' at main.cpp:124:26: main.cpp:140:13: warning: 'ret' may be used uninitialized [-Wmaybe-uninitialized] 140 | ret = (ret^factor()); | ~~~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int and_op()': main.cpp:150:9: note: 'ret' was declared here 150 | int ret; | ^~~ main.cpp: In function 'int not_op()': main.cpp:140:13: warning: 'ret' may be used uninitialized [-Wmaybe-uninitialized] 140 | ret = (ret^factor()); | ~~~~^~~~~~~~~~~~~~~~ main.cpp:150:9: note: 'ret' was declared here 150 | int ret; | ^~~