Compilare: main.cpp: In function 'int main()': main.cpp:42:62: warning: array subscript has type 'char' [-Wchar-subscripts] 42 | while(semne.empty()==false && semne.top()<cod[c[i]]) | ~~~^ main.cpp:52:31: warning: array subscript has type 'char' [-Wchar-subscripts] 52 | semne.push(cod[c[i]]); | ~~~^ main.cpp:56:31: warning: array subscript has type 'char' [-Wchar-subscripts] 56 | semne.push(cod[c[i]]); | ~~~^ main.cpp: In function 'long int op(long int, long int, long int)': main.cpp:25:1: warning: control reaches end of non-void function [-Wreturn-type] 25 | } | ^