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[C++] Using cin to get user input

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  1. #include <iostream>
  2. #include <string>
  3. #include <sstream>
  4.  
  5. using namespace std;
  6.  
  7. int main() {
  8.  
  9. 	string input = "";
  10.  
  11. 	// How to get a string/sentence with spaces
  12. 	cout << "Please enter a valid sentence (with spaces):\n>";
  13. 	getline(cin, input);
  14. 	cout << "You entered: " << input << endl << endl;
  15.  
  16. 	// How to get a number.
  17. 	int myNumber = 0;
  18.  
  19. 	while (true) {
  20. 		cout << "Please enter a valid number: ";
  21. 		getline(cin, input);
  22.  
  23. 		// This code converts from string to number safely.
  24. 		stringstream myStream(input);
  25. 		if (myStream >> myNumber)
  26. 			break;
  27. 		cout << "Invalid number, please try again" << endl;
  28. 	}
  29. 	cout << "You entered: " << myNumber << endl << endl;
  30.  
  31. 	// How to get a single char.
  32. 	char myChar = { 0 };
  33.  
  34. 	while (true) {
  35. 		cout << "Please enter 1 char: ";
  36. 		getline(cin, input);
  37.  
  38. 		if (input.length() == 1) {
  39. 			myChar = input[0];
  40. 			break;
  41. 		}
  42.  
  43. 		cout << "Invalid character, please try again" << endl;
  44. 	}
  45. 	cout << "You entered: " << myChar << endl << endl;
  46.  
  47. 	cout << "All done. And without using the >> operator" << endl;
  48.  
  49. 	return 0;
  50. }

URL: http://www.cplusplus.com/forum/articles/6046/

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