Compilare: user.cpp: In function ‘char* getPostfix(char*)’: user.cpp:23:10: warning: address of local variable ‘res’ returned [-Wreturn-local-addr] char res[Nmax]; ^ user.cpp: In function ‘int evaluatePostfix(char*)’: user.cpp:82:35: warning: unused variable ‘sol’ [-Wunused-variable] int sz = strlen(res), nr = 0, sol = 0; ^ user.cpp: In function ‘int priority(char)’: user.cpp:20:1: warning: control reaches end of non-void function [-Wreturn-type] } ^