How to handle invalid inputs while displaying Game menus? - c++

Question

#include <iostream>
#include <string>
using namespace std;
int main() { //Program starts
cout << "-------------------------------" << endl;
cout << "Welcome to Ninjas vs. Samurais!" << endl; //The intro
cout << "-------------------------------" << endl;
string newAdventure;
string chosenKind;
cout << "Hello, new solder! Are you ready for your adventure to begin, yes or no?\n"; //Asks you if you are ready
cin >> newAdventure;//Takes in if you are ready or not
if (newAdventure == "yes" || newAdventure == "Yes" || newAdventure == "Yes!") { //Asks if they are ready
cout << "Great!\n" << endl;
}
else if (newAdventure == "no" || newAdventure == "No" || newAdventure == "No!") { //Asks if they are ready
cout << "Too bad!\n" << endl;
}
else {
cout << "Please type a yes or no answer!\n";
}
system("PAUSE");
return 0;
}
If the user didn't input a valid answer, how could I make them restart the question? Would I have to use a loop? If so, how would I do that?

Answer 1

Yes you would have to use a loop. Something like:
while(cin >> newAdventure)//Takes in if you are ready or not
{
if (newAdventure == "yes" || newAdventure == "Yes" || newAdventure == "Yes!") { //Asks if they are ready
cout << "Great!\n" << endl;
break;
}
else if (newAdventure == "no" || newAdventure == "No" || newAdventure == "No!") { //Asks if they are ready
cout << "Too bad!\n" << endl;
break;
}
else {
cout << "Please type a yes or no answer!\n";
}
}
The break keyword will exit the loop once your answer is valid, otherwise, it keeps going.

Answer 2

You can add a condition like this:
while(true)
{
cout << "Hello, new solder! Are you ready for your adventure to begin, yes or no?\n"; //Asks you if you are ready
cin >> newAdventure;//Takes in if you are ready or not
if (newAdventure == "yes" || newAdventure == "Yes" || newAdventure == "Yes!") { //Asks if they are ready
cout << "Great!\n" << endl;
break;
}
else if (newAdventure == "no" || newAdventure == "No" || newAdventure == "No!") { //Asks if they are ready
cout << "Too bad!\n" << endl;
break;
}
else {
cout << "Please type a yes or no answer!\n";
}
}