std::string str1("trend");
std::string str2("micro");
std::string& strs = str1;
std::string* ptrs = &str1;
strs = str2;
ptrs = &str2;

• strs = micro, * ptrs = micro

• strs = micro, * ptrs = trend

• strs = trend, * ptrs = micro

• strs = trend, * ptrs = trend