Compilare: main.cpp: In function 'void make_operation(int, char, int, std::vector<double>&, std::vector<double>&)': main.cpp:62:20: warning: value computed is not used [-Wunused-value] 62 | dpx[i] == dpx[i-1] - opr; main.cpp:137:20: warning: value computed is not used [-Wunused-value] 137 | dpx[i] == dpx[i-1] - opr; main.cpp: In function 'int string_to_int(std::string)': main.cpp:197:20: warning: comparison of integer expressions of different signedness: 'int' and 'std::__cxx11::basic_string<char>::size_type' {aka 'long unsigned int'} [-Wsign-compare] 197 | for(int i=0; i < numar.length(); i++) | ~~^~~~~~~~~~~~~~~~ main.cpp: In function 'int main()': main.cpp:229:21: warning: unused variable 'buff' [-Wunused-variable] 229 | int buff = string_to_int(operand); | ^~~~