Question

I want to know how to make stop a while loop when the user just input an Enter without asking to continue or , here is my code:

int main()
{
    bool flag = true;
    int userInput;

    while(flag){
        cout<<"Give an Integer: ";
        if(!(cin >> userInput) ){ flag = false; break;}
        foo(userInput);
    }
}

Thanks in advance.

Answer 1

Use getline. Break if the string is empty. Then convert the string to an int.

for(std::string line;;)
{
    std::cout << "Give an Integer: ";
    std::getline(std::cin, line);
    if (line.empty())
        break;
    int userInput = std::stoi(line);
    foo(userInput);
}

std::stoi will throw an exception on failure, handle that however you want.