Eroare de compilare: user.cpp:1:21: error: iostream.h: No such file or directory user.cpp:2: error: ‘::main’ must return ‘int’ user.cpp: In function ‘int main()’: user.cpp:5: error: ‘cout’ was not declared in this scope user.cpp:5: error: ‘cin’ was not declared in this scope user.cpp:4: warning: unused variable ‘r’ user.cpp: At global scope: user.cpp:11: error: expected unqualified-id before ‘return’