console not displaying every character I type

[joshsmith01]

I am inputting in the console but as I type the number I can only see the first character. If I typed 345 on the 3 would show in the console. The calculations are being performed by the code and outputted correctly.

How do I change settings for the console?

all of my variables are double. Should I make some thing a float, int, or something else. Eventually, I have to calculate percentage of correct answers so I need something with a precision of at least 2 places after the decimal.

Thanks

[soranz]

What are you using to capture user input ?

[joshsmith01]

The assignment is to build a program that will help elementary student practice multiplication. The randomly generated numbers to multiply sometimes produce a product with two digits. When I enter the two digits in my console only the first one is visible. The calculations are still performed by the program though.

Here is my code. I am using Xcode.

#include <iostream>
#include <cstdlib>
#include <iomanip>
#include <string>
#include <ctime>
#include <cmath>
#include <fstream>
using namespace std;

//#include "GradeBook.h"
//int argc, const char * argv[]
int main(int argc, const char * argv[])
{
    double correctAnswer = 0;
    double incorrectAnswer = 0;
    double percentCorrect;
    
    
        for(int counter = 1; counter<=5; counter++)
        {
            srand( (unsigned)time(0) );//randomize the randomizer with time as the seed
            double x = rand()  % 9 +1;//randomly generated number between 1 and 10
            double y = rand() % 9 +1;//randomly generated number between 1 and 10
            
            

            double product = x * y;//the correct answer
            double answer;//student's answer input
           
            
            
            cout << "What is " << x << " times " << y << "?" << endl;//prompt user for mulitplication answer to randomly generated problem
            
            
            cin >> answer;//users answer to be checked and compared with computer's product
            if (answer == product)//checking to see correctness of user's answer
            {
                ++correctAnswer;
                int goodStatement = rand()  % 3 +1;
                switch (goodStatement)
                {
                    case 1:
                        puts("Very good!");
                        break;
                    case 2:
                        puts("Excellent");
                        break;
                    case 3:
                        puts("Nice work!");
                        break;
                    case 4:
                        puts("Keep up the good work");
                        break;
                        
                    default:
                        puts("Default good");
                        break;
                }

            }
            
            else
                
                
            while (answer!= product)
            {//while loop shall run with the same x and y values being presented. The program will not move forward until a correct answer is entered by user.
                ++incorrectAnswer;
                int badStatement = rand()  % 3 +1;
                switch (badStatement)
                {
                    case 1:
                        puts("No. Please try again");
                        break;
                    case 2:
                        puts("Wrong. Try once more");
                        break;
                    case 3:
                        puts("Don't give up");
                        break;
                    case 4:
                        puts("No. Keep trying");
                        break;
                    default:
                        puts("This is the default no");
                        break;
                }

                cout << "What is " << x << " times " << y << "?" << endl;
                cin >> answer;
            
                if (answer == product)//checking to see correctness of user's answer
                {
                ++correctAnswer;
                int goodStatement = rand()  % 3 +1;
                switch (goodStatement)
                {
                    case 1:
                        puts("Very good!");
                        break;
                    case 2:
                        puts("Excellent");
                        break;
                    case 3:
                        puts("Nice work!");
                        break;
                    case 4:
                        puts("Keep up the good work");
                        break;
                        
                    default:
                        puts("Default good");
                        break;
                }       
        
                }
            }
            
            
        }
    
            cout << "You got " << correctAnswer <<" of them correct. Great work!" << endl;
            cout << "You missed " << incorrectAnswer << "." << endl;
    
            percentCorrect = (correctAnswer / correctAnswer + incorrectAnswer)*100;
            cout << percentCorrect << (setprecision(2)) << "%" << endl;
    if (percentCorrect < .75) {
        cout << "Please ask you teacher for extra help." << endl;       
    } else {
        cout << "Congratulations, you are ready to go t the next level!" << endl;
    }
    
   
       

}

[soranz]

I don't see anything that'll cause this behavior here...
Does this work with multi digits ?

#include <iostream>
int main()
{
double x;
cin >> x;
cout << x;
system("PAUSE");
return 0;
}

You also have some includes there that are probably not necessary...

[TheIdeasMan]

This may not be related to your problem, but there are problems comparing doubles like you have. Floating point is stored as a binary fraction - not all numbers can be represented exactly. This always fails:

float a = 0.1;  //a == 0.09999997
if (10 * a == 1.0)  //fail == 0.99999997 

changing the type to double doesn't help, still the same type of problem.

You can use numeric_limits<double>epsilon. Google to find out how to use it. Also look at the reference page at the top left of this page.

HTH

[joshsmith01]

@soranz

I tried what you posted and no it did not work. I can still only see one input character. The out put is fine. it printed 7 or 8 characters or a number in scientific notation.

I am starting to think that it is not my code but a setting or preference in Xcode.

hmmm.

-Josh

[soranz]

Yes, it must be some outside setting either in Xcode or the console but I can't think of what...

[Jack Kearl]

The same thing happens for me, however I have noticed that if you switch the output drop down to "Target" or "All" after you compile the program, the proper numbers will show up.

[joshsmith01]

@Jack Kearl

Hey thanks for the reply. I did try your trick but it still didn't work for me. It is not a show stopper but darned close.

I have a tutor coming by this week so hopefully he has some experience with it and I'll post the solution if I've found one.

-Josh.

[gkorablev]

I have similar problem. This is possibly an XCode 4.5 bug, if you're using 4.5
Here is a self-explanatory discussion of the problem:
https://discussions.apple.com/thread/4318031?start=0&tstart=0

[joshsmith01]

Thanks gkorablev,

That makes me feel a little better that the problem is not with my machine. I have bookmarked the forum post on Apple's communities that you sent us. I will be eagerly waiting for that update.

-Josh

[joshsmith01]

It looks like Apple just released a bug fix for this. Yay. 03Oct2012.

"It looks like all our troubles are over"
-Walter Sobchek

[soranz]

Apple ? Well, they're not perfect either. lol