[C++] CHAPTER 4 샘플 코드

/* 샘플 코드 10 */
#include <iostream>

using namespace std;

int main() {
	int x;
	cout << "Enter a number :";
	cin >> x;
	if (x < 10) {
		cout << "You Entered a valve less than 10" << endl;

	}
}

/* 샘플 코드 11 */
#include <iostream>

using namespace std;
int main() {
	int num;
	cout << "Enter a number :";
	cin >> num;

	if (num < 0) {
		cout << "You entered a negative number\n";
	}
	else {
		cout << "You entered a non-negative number\n";
	}
}

/* 샘플 코드 12 */
#include <iostream>

using namespace std;
int main() {
	int num;
	cout << "Enter a number :";
	cin >> num;

	if (num < 0) {
		cout << "You entered a negative number\n";
	}
	else if (num == 0) {
		cout << "You entered zero\n";
	}
	else {
		cout << "You entered a non-negative number\n";
	}
}

/* 샘플 코드 13 */
#include <iostream>
#include <string>

using namespace std;

int main() {
	string password;

	cout << "Enter your password : " << endl;
	getline(cin, password, '\n');
	if (password == "xyzzy") {
		cout << "Access allowed" << "\n";
	}
	else {
		cout << "Bad password , Denide access!" << "\n";
		return 0;
	}


}

/* 샘플 코드 14 */
#include <iostream>
#include <string>

using namespace std;

int main() {
	string password;
	string username;

	cout << "Enter your password :" << endl;
	getline(cin, password, '\n');
	cout << "Enter your username :" << endl;
	getline(cin, username, '\n');

	if (username == "root" && password == "xyzzy") {
		cout << "Access allowed" << endl;
	}
	else {
		cout << "Bad username or password. Denied access !" << endl;
		return 0;
	}
}