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browny on 06/07/11

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Last Edited at 06/07/11 03:45pm

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[C++] Using cin to get user input

/ Published in: C++

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#include <iostream>
#include <string>
#include <sstream>

using namespace std;

int main() {

string input = "";

// How to get a string/sentence with spaces
	cout << "Please enter a valid sentence (with spaces):\n>";
	getline(cin, input);
	cout << "You entered: " << input << endl << endl;

// How to get a number.
	int myNumber = 0;

while (true) {
		cout << "Please enter a valid number: ";
		getline(cin, input);

// This code converts from string to number safely.
		stringstream myStream(input);
		if (myStream >> myNumber)
			break;
		cout << "Invalid number, please try again" << endl;
	}
	cout << "You entered: " << myNumber << endl << endl;

// How to get a single char.
	char myChar = { 0 };

while (true) {
		cout << "Please enter 1 char: ";
		getline(cin, input);

if (input.length() == 1) {
			myChar = input[0];
			break;
		}

cout << "Invalid character, please try again" << endl;
	}
	cout << "You entered: " << myChar << endl << endl;

cout << "All done. And without using the >> operator" << endl;

return 0;
}

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

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