Break a loop when the user just input an enter in visual c++ or code blocks -

i want know how make stop while loop when user input enter without asking continue or , here code:

int main() {     bool flag = true;     int userinput;      while(flag){         cout<<"give integer: ";         if(!(cin >> userinput) ){ flag = false; break;}         foo(userinput);     } } 

thanks in advance.

use getline. break if string empty. convert string int.

for(std::string line;;) {     std::cout << "give integer: ";     std::getline(std::cin, line);     if (line.empty())         break;     int userinput = std::stoi(line);     foo(userinput); } 

std::stoi throw exception on failure, handle want.