Eroare de compilare: main.cpp: In function 'int main()': main.cpp:8:9: error: 'cin' was not declared in this scope 8 | cin >> a >> b; | ^~~ main.cpp:3:1: note: 'std::cin' is defined in header '<iostream>'; did you forget to '#include <iostream>'? 2 | #include <cmath> +++ |+#include <iostream> 3 | using namespace std; main.cpp:28:9: error: 'cout' was not declared in this scope 28 | cout << s; | ^~~~ main.cpp:28:9: note: 'std::cout' is defined in header '<iostream>'; did you forget to '#include <iostream>'? main.cpp:12:13: warning: unused variable 's2' [-Wunused-variable] 12 | int s2 = 2 * d; | ^~ Non zero exit status: 1