Compilare: main.cpp: In function 'int eval(int, char)': main.cpp:78:26: warning: NULL used in arithmetic [-Wpointer-arith] while (functia[i] != NULL) ^~~~ main.cpp:127:48: warning: array subscript has type 'char' [-Wchar-subscripts] if (marcate[a[index][j]] == 1001) ^ main.cpp:129:48: warning: array subscript has type 'char' [-Wchar-subscripts] marcate[a[index][j]] = st.back(); ^ main.cpp:142:53: warning: array subscript has type 'char' [-Wchar-subscripts] val.push(marcate[a[index][j]]); ^ main.cpp:147:46: warning: NULL used in arithmetic [-Wpointer-arith] while (a[index][j]!= NULL && a[index][j] >= '0' && a[index][j] <= '9') ^~~~ main.cpp: In function 'int AplicareOp(int, int, char)': main.cpp:43:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int Cautare(char)': main.cpp:62:1: warning: control reaches end of non-void function [-Wreturn-type] } ^ main.cpp: In function 'int Cautare_Index(char)': main.cpp:73:1: warning: control reaches end of non-void function [-Wreturn-type] } ^