C++ examples for Data Type:string
Having the User Type Something, convert string to number
#include <iostream> #include <sstream> #include <conio.h> using namespace std; int StringToNumber(string MyString) { istringstream converter(MyString); // Holds the string. int result; // Holds the integer result. // Perform the conversion. converter >> result;//from ww w. j a v a2 s .c om return result; } string EnterOnlyNumbers() { string numAsString = ""; // Holds the numeric string. char ch = getch(); // Obtains a single character from the user. // Keep requesting characters until the user presses Enter. while (ch != '\r') // \r is the enter key { // Add characters only if they are numbers. if (ch >= '0' && ch <= '9') { cout << ch; numAsString += ch; } // Get the next character from the user. ch = getch(); } return numAsString; } string EnterPassword() { string numAsString = ""; // Holds the password string. char ch = getch(); // Obtains a single character from the user. while (ch != '\r') // \r is the enter key { cout << '*'; // Add the character to the password string. numAsString += ch; // Get the next character from the user. ch = getch(); } return numAsString; } int main() { string name; cout << "What is your name? "; cin >> name; cout << "Hello " << name << endl; // enter a number, // but allows you to enter anything! int x; cout << endl; cout << "Enter a number, any number! "; cin >> x; cout << "You chose " << x << endl; // you can only enter a number. cout << endl; cout << "This time you'll only be able to enter a number!" << endl; cout << "Enter a number, any number! "; string entered = EnterOnlyNumbers(); int num = StringToNumber(entered); cout << endl << "You entered " << num << endl; // Now enter a password! cout << endl; cout << "Enter your password! "; string password = EnterPassword(); cout << endl << "password:" << password << endl; return 0; }