Compilare: main.cpp: In function 'int main()': main.cpp:17:16: warning: comparison between signed and unsigned integer expressions [-Wsign-compare] for (i=0; i<strlen(s); i++){ ~^~~~~~~~~~ main.cpp:58:16: warning: array subscript has type 'char' [-Wchar-subscripts] val[car] = 1 - val[car]; ^ main.cpp:58:31: warning: array subscript has type 'char' [-Wchar-subscripts] val[car] = 1 - val[car]; ^ main.cpp: In function 'int factor()': main.cpp:110:26: warning: array subscript has type 'char' [-Wchar-subscripts] return val[c[i++]]; ^