C++ Yes or No without Boolean

Question

dominiquehelper 0 Newbie Poster

11 Years Ago

Exercise:
Write a C++ program using do-while loop that prompts for and inputs a user entry of "Y" or "N". f the user fails to enter a correct value, the loop outputs an error message and then repeats the request for the user to enter a value.

This is what I did and it seems like I did the other way around. (NO BOOLEANS, NO GETLINES). Just Do-While Statement

#include <iostream>
using namespace std;
int main()
{
    char ans = ' ';
    string ques = "Are you 18 years old or above? ";

    do 
    {
           cout<<ques;
           cin>>ans;

            if (ans == 'y'|| ans == 'Y'|| ans == 'N' || ans == 'n')
            {
                    cout<<"VALID LETTER"<<endl;
            }   
            else
            {
                cout<<"INVALID LETTER"<<endl;
            }                  


    }while (ans == 'y'|| ans == 'Y' || ans == 'N' || ans == 'n');

    system("pause");
}

c++

Edited 11 Years Ago by dominiquehelper because: Incorrect Input

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Latest Post 11 Years Ago Latest Post by PodHunter

mark5rockzz_1 0 Newbie Poster

11 Years Ago

#include <iostream>
using namespace std;

int main()
{

    char ans = ' ';
    string ques = "Are you 18 years old or above? ";

    do 
    {

           cout<<ques;
           cin>>ans;

            if (ans == 'y'|| ans == 'Y'|| ans == 'N' || ans == 'n')
            {
                cout<<"VALID LETTER"<<endl;
                //you might want to put a `break` keyword here
                //or other to terminate the loop?
            }   
            else
            {
                cout<<"INVALID LETTER"<<endl;
            }

    }while (ans == 'y'|| ans == 'Y' || ans == 'N' || ans == 'n');   
    //you mean
    //while (!(ans == 'y'|| ans == 'Y' || ans == 'N' || ans == 'n'))

    system("pause");
}

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kal_crazy 13 Junior Poster · Answer 1 · 2013-09-10T18:56:30+00:00

kal_crazy 13 Junior Poster

11 Years Ago

Also, you did not type in

#include <string>

phorce commented: Not really required. Most compilers will accept without including string. The user is not doing anything which really requires the library. -1

Ancient Dragon commented: No reason for the downvote +14

Ancient Dragon 5,243 Achieved Level 70 Team Colleague Featured Poster · Answer 2 · 2013-09-11T04:00:01+00:00

@dominiquehelper: what exactly is the question about the code you posted? Does the code you posted compile and work correctly? If not, why not? Just posting code without an explanation of what you don't understand isn't helpful to any of us -- we are not mind readers.

Here is some good advice for new members. You should read that post.

PodHunter 0 Newbie Poster · Answer 3 · 2013-09-11T08:04:01+00:00

You say 'no booleans', but why? There are several boolean tests in your code:

if (/* boolean test1 */)
do { ... } while (/* boolean test2 */)