Compilare: main.cpp: In function 'int nr(char*)': main.cpp:17:9: warning: unused variable 'pow' [-Wunused-variable] int pow = 10; ^~~ main.cpp: In function 'void op(char*)': main.cpp:70:34: warning: logical not is only applied to the left hand side of comparison [-Wlogical-not-parentheses] while(!stack1.size() > 1){ //sa mai ramana un element in stiva1 ^ main.cpp:70:34: warning: comparison of constant '1' with boolean expression is always false [-Wbool-compare] while(!stack1.size() > 1){ //sa mai ramana un element in stiva1 ~~~~~~~~~~~~~~~^~~