Compilare: user.cpp: In function ‘int rezolvaExp(char*)’: user.cpp:38:10: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] elem[0] = NULL; ^ user.cpp:45:17: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] elem[lgElem] = NULL; ^ user.cpp:58:73: warning: suggest parentheses around ‘&&’ within ‘||’ [-Wparentheses] if (sir[i] == '+' || sir[i] == '-' || sir[i] == '*' || sir[i] == '/' && rez.size() >= 2) ^ user.cpp: In function ‘char* convToPostFix(char*)’: user.cpp:82:10: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] elem[0] = NULL; ^ user.cpp:83:9: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] rez[0] = NULL; ^ user.cpp:90:17: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] elem[lgElem] = NULL; ^ user.cpp:127:18: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] rez[lgRez] = NULL; ^ user.cpp:141:18: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] rez[lgRez] = NULL; ^ user.cpp:176:14: warning: converting to non-pointer type ‘char’ from NULL [-Wconversion-null] rez[lgRez] = NULL; ^ user.cpp:79:21: warning: address of local variable ‘rez’ returned [-Wreturn-local-addr] char elem[LGElem], rez[NMax], c; ^