如何检测 C++ 中的单个 Enter 键？

Question

I am trying to get an input such as 'Country name'. If you just press Enter, Country name should be set to default country name (ex)USA). Otherwise, input string would be set to country name. I am confused to how to detect input as a single Enter key or normal string.

Answer 1

Use std::getline() to read a whole line of user input up to the ENTER key (which will be read and discarded for you). If the returned string is empty, replace it with a default value as needed.

std::cout << "Country name: ";

std::countryName;
std::getline(std::cin, countryName);

if (countryName.empty())
    countryName = "USA";

Answer 2

Try this

std::cout << "Country name: ";
std::getline(std::cin, countryName);
if(countryName==""){
    countryName="USA"
}

also use cin.ignore(); after every use of cin>> if you have to use getline() in the next line.

you can also use cin.sync(); cin.get();