Whitespaces..

While programming in c++ the standard i/o object cin ignores the whitespaces.

You can use std::noskipws to disable the whitespace skipping that std::cin does by default:

#include 
#include 

int main() {
  char c;
  std::cin >> std::noskipws;
  while (std::cin >> c) {
    if (c == ' ')
      std::cout << "A space!" << std::endl;
  }
  return 0;
}