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C++ Need Help! Hello I get this error message when I use stoi to validate the us

ID: 3662841 • Letter: C

Question

C++ Need Help!

Hello I get this error message when I use stoi to validate the user input (I want only integer no letters, no special character, no whitespace, no empty input).

And I have no clue what it's saying.

Please help.

This is what I have so far.(I bolded out the part where I have a problem with).

Thank you very much. I appreciate it!!

#include // limits of named constants, see page 1284
#include //math library
#include // library for strings and other useful validations
#include // library for manipulating output
#include // library to direct output to files and get input from files
#include // library for the rand and srand functions
#include // library to work with time
#include //string library
#include //to be able to use strlen
#define NDEBUG
#include
#include // ----typeid(varName).name()
#include

using namespace std;

//void generateDivision(double totalWages, int totalCorrect, int totalWrong); Wrong
void generateAddition(double& totalWages, int& totalCorrect, int& totalWrong);
void generateSubtraction(double& totalWages, int& totalCorrect, int& totalWrong);
void generateMultiplication(double& totalWages, int& totalCorrect, int& totalWrong);
void generateDivision(double& totalWages, int& totalCorrect, int& totalWrong);
void menu();
void checkTheAnswwer(string theUserResponse, int theCorrectAnswer, double& totalWages, int& totalCorrect, int& totalWrong);
void stats(string userName, int totalCorrect, int totalIncorrect, double totalWages);
int main()
{
   string userInput = "";
   double totalWages = 0;
   int totalCorrect = 0;
   int totalWrong = 0;
   string userName;
   string go = "y";
   int userInputlength = 0;
   ifstream inData;
   ofstream outData;
   char continu = 'y';

   //splash
   cout
       << "***********************************************************" << endl
       << "***********************************************************" << endl
       << "***********************************************************" << endl
       << "***********************************************************" << endl
       << "********************** **********************" << endl
       << "********************** **********************" << endl
       << "********************** The Math Game **********************" << endl
       << "********************** By **********************" << endl
       << "********************** asdasdsasasadas **********************" << endl
       << "********************** **********************" << endl
       << "********************** **********************" << endl
       << "***********************************************************" << endl
       << "***********************************************************" << endl
       << "***********************************************************" << endl
       << "***********************************************************" << endl;

   cout
       << " Do you want to play a game? Press Y/y to continue, any other char to exit. "
       << endl;
   getline(cin, userInput);

   while (userInput == "y" || userInput == "Y")
   {
       int userNamelength=0;
       char ch=' ';
       system("cls");
      
       while (1)
           {
               cout << "Enter your name: ";
               getline(cin, userName);
              
               bool Reject = false;

               if (userName.empty())
                   continue;


               for (unsigned int i = 0; i < userName.length() && !Reject; i++)
               {
                   if (isalpha(userName[i]))
                       continue;
                  
                   Reject = true;
                  
               }
          
               if (!Reject)
                   break;
                              
           }
      
       cout << " Hi " << userName << endl;
       cout << " ";

       while (continu == 'y' || continu == 'Y')
       {
           string userFileName = userName + ".txt";
           inData.open(userFileName);

           if (!inData.is_open())
           {
               //create userFile for output. remember that when you issue   the command outData.open(userFileName.c_str());
               //if the file does not exist, it will get created.
               outData.open(userFileName.c_str());
               cout << "Welcome " << userName << " I notice that this is the first time you play the game ";
               //we store values in the file to prevent an exception if we attempt to read data from an empty file
           /*   outData << userName << endl;
               outData << totalCorrect << endl;
               outData << totalWrong << endl;
               outData << totalWages << endl;*/
               cout << "A text file with your name was created ";
               cout << endl;
               system("pause");
               break;

           }
           else //the file exists
           {
               //you may proceed to read statistics
               //userName; totalCorrect, totalWrong, totalEarnings
               //cin>>userName;


               inData >> userName;
               inData >> totalCorrect;
               inData >> totalWrong;
               inData >> totalWages;
               //close file once you read the data
               inData.close();
               //outData.open(userFileName.c_str());
               cout << "welcome " << userName << " I notice that you have played this game before ";
               cout << " The statistics from the previous game were retrieved and loaded ";
               cout << endl;
               system("pause");
               break;

           }
       }
  
       while (go == "y")
       {
           menu();
           getline(cin, userInput);

           if (userInput == "1")
           {
               generateAddition(totalWages, totalCorrect, totalWrong);
           }


           if (userInput == "2")
           {
               generateSubtraction(totalWages, totalCorrect, totalWrong);
           }


           if (userInput == "3")
           {
               generateMultiplication(totalWages, totalCorrect, totalWrong);
           }
      

           if (userInput == "4")
           {
               generateDivision(totalWages, totalCorrect, totalWrong);
           }


           if (userInput == "5")
           {
               stats(userName, totalCorrect, totalWrong, totalWages);
           }

           if (userInput=="6")
           {
               outData << userName << endl;
               outData << totalCorrect << endl;
               outData << totalWrong << endl;
               outData << totalWages << endl;
               outData.close();
               system("pause");
                   return 0;
           }
       }
       system("pause");
       return 0;
   }

   while (userInput != "y" || userInput != "Y")

   {
       system("cls");
       cout << "Bye Bye" << endl;
       system("pause");
       return 0;
   }

}


void generateAddition(double& totalWages, int& totalCorrect, int& totalWrong)
{
   string theUserResponse;

   system("cls");
   srand(time(NULL));
   unsigned int num1 = rand()%10+1;
   unsigned int num2 = rand()%10+1;
   unsigned int theCorrectAnswer = num1 + num2;

   cout << "**************** Addition *****************" << endl;
   cout << "*************************************************" << endl;
   cout << "*************************************************" << endl;
   cout << " What is " <   cout << "*************************************************" << endl;
   cout << "Your Answer = " << endl;
   getline(cin, theUserResponse);
   cout<< " ";
   //enter an answer
   //validate the userAnswer
   system("cls");
   checkTheAnswwer(theUserResponse, theCorrectAnswer, totalWages, totalCorrect, totalWrong);
   system("pause");
}

void generateSubtraction(double& totalWages, int& totalCorrect, int& totalWrong)
{
   string theUserResponse;

   system("cls");
   srand(time(NULL));
   unsigned int num1 = rand() % 10 + 1;
   unsigned int num2 = rand() % 10 + 1;
   unsigned int theCorrectAnswer = num1+num2-num2;

   cout << "************** Subtraction ***************" << endl;
   cout << "*************************************************" << endl;
   cout << "*************************************************" << endl;
   cout << " What is " << num1+num2 << " - " << num2 << " = ?"<< endl;
   cout << "*************************************************" << endl;
   cout << "*************************************************" << endl;
   cout << " Your Answer = " << endl;
   getline(cin, theUserResponse);
   cout << " ";
   //enter an answer
   //validate the userAnswer
   system("cls");
   checkTheAnswwer(theUserResponse, theCorrectAnswer, totalWages, totalCorrect, totalWrong);
   system("pause");

}

void generateMultiplication(double& totalWages, int& totalCorrect, int& totalWrong)
{
   string theUserResponse;

   system("cls");
   srand(time(NULL));
   unsigned int num1 = rand() % 10 + 1;
   unsigned int num2 = rand() % 10 + 1;
   unsigned int theCorrectAnswer = num1 * num2;

   cout << "************* Multiplication **************" << endl;
   cout << "*************************************************" << endl;
   cout << "*************************************************" << endl;
   cout << " What is " << num1 << " X " << num2 << " = ?" << endl;
   cout << "*************************************************" << endl;
   cout << "*************************************************" << endl;
   cout << "Your Answer = " << endl;
   getline(cin, theUserResponse);
   cout << " ";
   //enter an answer
   //validate the userAnswer
   system("cls");
   checkTheAnswwer(theUserResponse, theCorrectAnswer, totalWages, totalCorrect, totalWrong);
   system("pause");
}
void generateDivision(double& totalWages, int& totalCorrect, int& totalWrong)
{
   string theUserResponse;

   system("cls");
   srand(time(NULL));
   unsigned int num1 = rand() % 10 + 1;
   unsigned int num2 = rand() % 10 + 1;
   unsigned int theCorrectAnswer = num1;

   cout << "**************** Division *****************" << endl;
   cout << "*************************************************" << endl;
   cout << "*************************************************" << endl;
   cout << " What is " << num1*num2 << " / " << num2 << " = ?" << endl;
   cout << "*************************************************" << endl;
   cout << "*************************************************" << endl;
   cout << "Your Answer = " << endl;
   getline(cin, theUserResponse);
   cout << " ";
   //enter an answer
   //validate the userAnswer
   system("cls");
   checkTheAnswwer(theUserResponse, theCorrectAnswer, totalWages, totalCorrect, totalWrong);
   system("pause");

}
void menu()
{
   system("cls");
   //cout << "Hi " << userName;
   cout
       << "****************** Choose your options *******************" << endl
       << "************************************************************" << endl
       << "************************************************************" << endl
       << "****************** 1. addition *******************" << endl
       << "****************** 2. subtraction *******************" << endl
       << "****************** 3. multiplication *******************" << endl
       << "****************** 4. division *******************" << endl
       << "****************** 5. stats *******************" << endl
       << "****************** 6. quit *******************" << endl
       << "************************************************************" << endl
       << "************************************************************" << endl
       << "************************************************************" << endl;
}
//two passing by value and three pass by reference
void checkTheAnswwer(string theUserResponse, int theCorrectAnswer, double& totalWages, int& totalCorrect, int& totalWrong)
{
   int userAnswer = stoi(theUserResponse);//stoi is a function that turns string into the integer.
   if (userAnswer == theCorrectAnswer)
   {
       cout << "******************** Good Job! ********************" << endl;
       totalCorrect++;
       //totalWages=totalWages+0.05;
       totalWages += 0.05;

   }
   else
   {
       cout << "******************** Too Bad! ********************" << endl;
       totalWrong++;
       //totalWages=totalWages-0.05;
       totalWages -= 0.03;
   }
}

void stats(string userName, int totalCorrect, int totalIncorrect, double totalWages)
{

   system("cls");
   cout << "******************** STATISTIC ********************" << endl;
   cout << "***********************************************************" << endl;
   cout << "***********************************************************" << endl;
   cout << " User Name: " << userName << endl;
   cout << " Total Correct: " << totalCorrect << endl;
   cout << " Total Incorrect: " << totalIncorrect << endl;
   cout << " Total wages: $" << totalWages << endl;
   cout << "***********************************************************" << endl;
   cout << "***********************************************************" << endl;
   cout << "***********************************************************" << endl;
   system("pause");
   system("cls");//clears the screen


   }

Explanation / Answer

#include<limits.h> // limits of named constants, see page 1284
#include<math.h> //math library
#include<string> // library for strings and other useful validations
#include<iostream> // library for manipulating output
#include<fstream>// library to direct output to files and get input from files
#include<stdlib.h>// library for the rand and srand functions
#include<time.h> // library to work with time
#include<cstring> //string library
#define NDEBUG
using namespace std;
//void generateDivision(double totalWages, int totalCorrect, int totalWrong); Wrong
void generateAddition(double& totalWages, int& totalCorrect, int& totalWrong);
void generateSubtraction(double& totalWages, int& totalCorrect, int& totalWrong);
void generateMultiplication(double& totalWages, int& totalCorrect, int& totalWrong);
void generateDivision(double& totalWages, int& totalCorrect, int& totalWrong);
void menu();
void checkTheAnswwer(string theUserResponse, int theCorrectAnswer, double& totalWages, int& totalCorrect, int& totalWrong);
void stats(string userName, int totalCorrect, int totalIncorrect, double totalWages);
int main()
{
string userInput = "";
double totalWages = 0;
int totalCorrect = 0;
int totalWrong = 0;
string userName;
string go = "y";
int userInputlength = 0;

ofstream outData;
char continu = 'y';
//splash
cout
<< "***********************************************************" << endl
<< "***********************************************************" << endl
<< "***********************************************************" << endl
<< "***********************************************************" << endl
<< "********************** **********************" << endl
<< "********************** **********************" << endl
<< "********************** The Math Game **********************" << endl
<< "********************** By **********************" << endl
<< "********************** asdasdsasasadas **********************" << endl
<< "********************** **********************" << endl
<< "********************** **********************" << endl
<< "***********************************************************" << endl
<< "***********************************************************" << endl
<< "***********************************************************" << endl
<< "***********************************************************" << endl;
cout
<< " Do you want to play a game? Press Y/y to continue, any other char to exit. "
<< endl;
getline(cin, userInput);
while (userInput == "y" || userInput == "Y")
{
int userNamelength=0;
char ch=' ';
system("cls");
  
while (1)
{
cout << "Enter your name: ";
getline(cin, userName);
  
bool Reject = false;
if (userName.empty())
continue;

for (unsigned int i = 0; i < userName.length() && !Reject; i++)
{
if (isalpha(userName[i]))
continue;
  
Reject = true;
  
}
  
if (!Reject)
break;
  
}
  
cout << " Hi " << userName << endl;
cout << " ";
while (continu == 'y' || continu == 'Y')
{
string userFileName = userName + ".txt";
ifstream inData(userFileName, std::ifstream::in);
//ifstream myfile ("example.txt");
if (!inData.is_open())
{
//create userFile for output. remember that when you issue the command outData.open(userFileName.c_str());
//if the file does not exist, it will get created.
outData.open(userFileName.c_str());
cout << "Welcome " << userName << " I notice that this is the first time you play the game ";
//we store values in the file to prevent an exception if we attempt to read data from an empty file
/* outData << userName << endl;
outData << totalCorrect << endl;
outData << totalWrong << endl;
outData << totalWages << endl;*/
cout << "A text file with your name was created ";
cout << endl;
system("pause");
break;
}
else //the file exists
{
//you may proceed to read statistics
//userName; totalCorrect, totalWrong, totalEarnings
//cin>>userName;

inData >> userName;
inData >> totalCorrect;
inData >> totalWrong;
inData >> totalWages;
//close file once you read the data
inData.close();
//outData.open(userFileName.c_str());
cout << "welcome " << userName << " I notice that you have played this game before ";
cout << " The statistics from the previous game were retrieved and loaded ";
cout << endl;
system("pause");
break;
}
}
  
while (go == "y")
{
menu();
getline(cin, userInput);
if (userInput == "1")
{
generateAddition(totalWages, totalCorrect, totalWrong);
}

if (userInput == "2")
{
generateSubtraction(totalWages, totalCorrect, totalWrong);
}

if (userInput == "3")
{
generateMultiplication(totalWages, totalCorrect, totalWrong);
}
  
if (userInput == "4")
{
generateDivision(totalWages, totalCorrect, totalWrong);
}

if (userInput == "5")
{
stats(userName, totalCorrect, totalWrong, totalWages);
}
if (userInput=="6")
{
outData << userName << endl;
outData << totalCorrect << endl;
outData << totalWrong << endl;
outData << totalWages << endl;
outData.close();
system("pause");
return 0;
}
}
system("pause");
return 0;
}
while (userInput != "y" || userInput != "Y")
{
system("cls");
cout << "Bye Bye" << endl;
system("pause");
return 0;
}
}

void generateAddition(double& totalWages, int& totalCorrect, int& totalWrong)
{
string theUserResponse;
system("cls");
srand(time(NULL));
unsigned int num1 = rand()%10+1;
unsigned int num2 = rand()%10+1;
unsigned int theCorrectAnswer = num1 + num2;
cout << "**************** Addition *****************" << endl;
cout << "*************************************************" << endl;
cout << "*************************************************" << endl;
cout << " What is " < cout << "*************************************************" << endl;
cout << "Your Answer = " << endl;
getline(cin, theUserResponse);
cout<< " ";
//enter an answer
//validate the userAnswer
system("cls");
checkTheAnswwer(theUserResponse, theCorrectAnswer, totalWages, totalCorrect, totalWrong);
system("pause");
}
void generateSubtraction(double& totalWages, int& totalCorrect, int& totalWrong)
{
string theUserResponse;
system("cls");
srand(time(NULL));
unsigned int num1 = rand() % 10 + 1;
unsigned int num2 = rand() % 10 + 1;
unsigned int theCorrectAnswer = num1+num2-num2;
cout << "************** Subtraction ***************" << endl;
cout << "*************************************************" << endl;
cout << "*************************************************" << endl;
cout << " What is " << num1+num2 << " - " << num2 << " = ?"<< endl;
cout << "*************************************************" << endl;
cout << "*************************************************" << endl;
cout << " Your Answer = " << endl;
getline(cin, theUserResponse);
cout << " ";
//enter an answer
//validate the userAnswer
system("cls");
checkTheAnswwer(theUserResponse, theCorrectAnswer, totalWages, totalCorrect, totalWrong);
system("pause");
}
void generateMultiplication(double& totalWages, int& totalCorrect, int& totalWrong)
{
string theUserResponse;
system("cls");
srand(time(NULL));
unsigned int num1 = rand() % 10 + 1;
unsigned int num2 = rand() % 10 + 1;
unsigned int theCorrectAnswer = num1 * num2;
cout << "************* Multiplication **************" << endl;
cout << "*************************************************" << endl;
cout << "*************************************************" << endl;
cout << " What is " << num1 << " X " << num2 << " = ?" << endl;
cout << "*************************************************" << endl;
cout << "*************************************************" << endl;
cout << "Your Answer = " << endl;
getline(cin, theUserResponse);
cout << " ";
//enter an answer
//validate the userAnswer
system("cls");
checkTheAnswwer(theUserResponse, theCorrectAnswer, totalWages, totalCorrect, totalWrong);
system("pause");
}
void generateDivision(double& totalWages, int& totalCorrect, int& totalWrong)
{
string theUserResponse;
system("cls");
srand(time(NULL));
unsigned int num1 = rand() % 10 + 1;
unsigned int num2 = rand() % 10 + 1;
unsigned int theCorrectAnswer = num1;
cout << "**************** Division *****************" << endl;
cout << "*************************************************" << endl;
cout << "*************************************************" << endl;
cout << " What is " << num1*num2 << " / " << num2 << " = ?" << endl;
cout << "*************************************************" << endl;
cout << "*************************************************" << endl;
cout << "Your Answer = " << endl;
getline(cin, theUserResponse);
cout << " ";
//enter an answer
//validate the userAnswer
system("cls");
checkTheAnswwer(theUserResponse, theCorrectAnswer, totalWages, totalCorrect, totalWrong);
system("pause");
}
void menu()
{
system("cls");
//cout << "Hi " << userName;
cout
<< "****************** Choose your options *******************" << endl
<< "************************************************************" << endl
<< "************************************************************" << endl
<< "****************** 1. addition *******************" << endl
<< "****************** 2. subtraction *******************" << endl
<< "****************** 3. multiplication *******************" << endl
<< "****************** 4. division *******************" << endl
<< "****************** 5. stats *******************" << endl
<< "****************** 6. quit *******************" << endl
<< "************************************************************" << endl
<< "************************************************************" << endl
<< "************************************************************" << endl;
}
//two passing by value and three pass by reference
void checkTheAnswwer(string theUserResponse, int theCorrectAnswer, double& totalWages, int& totalCorrect, int& totalWrong)
{
int userAnswer = stoi(theUserResponse);//stoi is a function that turns string into the integer.
if (userAnswer == theCorrectAnswer)
{
cout << "******************** Good Job! ********************" << endl;
totalCorrect++;
//totalWages=totalWages+0.05;
totalWages += 0.05;
}
else
{
cout << "******************** Too Bad! ********************" << endl;
totalWrong++;
//totalWages=totalWages-0.05;
totalWages -= 0.03;
}
}
void stats(string userName, int totalCorrect, int totalIncorrect, double totalWages)
{
system("cls");
cout << "******************** STATISTIC ********************" << endl;
cout << "***********************************************************" << endl;
cout << "***********************************************************" << endl;
cout << " User Name: " << userName << endl;
cout << " Total Correct: " << totalCorrect << endl;
cout << " Total Incorrect: " << totalIncorrect << endl;
cout << " Total wages: $" << totalWages << endl;
cout << "***********************************************************" << endl;
cout << "***********************************************************" << endl;
cout << "***********************************************************" << endl;
system("pause");
system("cls");//clears the screen

}

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