0

How do I change this code so that the user can choose a math operation and determine have that type of operation(either add sub mult or divide) run as much as a user wants it to? Say, if the user wanted 5 addition questions only.

And how do I keep track of the correct answers that they get?

```
#include <iostream>
#include <cstdlib>
#include <ctime>
#include <iomanip>
#include <fstream>
using namespace std;
// Function prototypes
int getuserchoice();
int getNumQuestions();
int getHighestNum();
void showmenu();
void showcorrectanswer(int, int);
//Variables
int previoususer;
int number1, number2;
int numquestions;
int highestNum;
char username;
int userchoice;
int studentanswer;
float correctanswer;
string newuser;
// Variables to keep track of scores
int userscore = 0;
//Constants for the menu choices
const int ADDITION_CHOICE = 1,
SUBTRACTION_CHOICE = 2,
MULTIPLICATION_CHOICE = 3,
DIVISION_CHOICE = 4,
QUIT_CHOICE = 5;
int main()
{
cout << "This program will display a menu of math operations. You will enter your name then choose an option for the menu. The program will save your scores and keep track of it. Let's get started!\n\n" << endl;
cout << "The previous user is: "<< previoususer << endl;
cout << endl;
cout << "What is your name?" << endl;
cin >> newuser;
cout << "Hi, " << newuser << endl;
// Get userchoice
userchoice = getuserchoice();
// Get number of questions
numquestions = getNumQuestions();
// Get highest number
highestNum = getHighestNum();
//Write name to file
ofstream filenames;
filenames.open("nameuser.txt");
filenames << newuser;
filenames.close();
cout << newuser;
// Show menu
showmenu();
return 0;
}
//GET USERCHOICE FUNCTION
int getuserchoice()
{
cout << "Choose from the following options:\n\n"
<< "1. Addition\n"
<< "2. Subtraction\n"
<< "3. Multiplication\n"
<< "4. Division\n"
<< "5. Quit\n\n"
<< "Enter a number from 1 to 5 and hit Enter: \n";
cin >> userchoice;
return userchoice;
}
//NUMBER OF QUESTIONS FUNCTION
int getNumQuestions()
{
cout << "How many questions do you want to answer? "<< endl;
cin >> numquestions;
return numquestions;
}
// GET HIGHEST NUM FUNCTION
int getHighestNum()
{
cout << "What is the highest number that you want in your questions?" << endl;
cin >> highestNum;
return highestNum;
}
void showmenu()
{
do
{ // Beggining of do-while loop
unsigned int number1 =0;
unsigned int number2 =0;
srand(unsigned(time(0)));
number1 = 1+rand() % highestNum;
number2 = 1+rand() % highestNum;
// Validates the input (must not be less than 1/greater than 5)
if (userchoice < ADDITION_CHOICE || userchoice > QUIT_CHOICE)
{
cout << "Please choose a valid number from 1 to 5\n\n"
<< "1. Addition\n"
<< "2. Subtraction\n"
<< "3. Multiplication\n"
<< "4. Division\n"
<< "5. Quit\n\n"
<< "Enter your choice: ";
cin >> userchoice;
}
if (userchoice == 5) {
cout << "goodbye" << endl;
}
//Setting the decimal to two decimal places.
cout << setprecision(2) << fixed << endl;
// Respond to user's choice
switch (userchoice)
{ // Addition
case ADDITION_CHOICE:
cout << "Solve the problem below: \n";
cout << number1 << " + " << number2 << " = " << endl;
correctanswer = number1 + number2;
cin >> studentanswer;
if (studentanswer == correctanswer)
cout << "Correct! Congratulations.\n";
else
cout << "That is incorrect. The correct answer is " << correctanswer << endl;
break;
// Subtraction
case SUBTRACTION_CHOICE:
cout << "Solve the problem below: \n";
cout << number1 << " - " << number2 << " = " << endl;
correctanswer = number1 - number2;
cin >> studentanswer;
if (studentanswer == correctanswer)
cout << "Correct! Congratulations.\n";
else
cout << "That is incorrect. The correct answer is " << correctanswer << endl;
break;
// Multiplication
case MULTIPLICATION_CHOICE:
cout << number1 << " * " << number2 << " = " << endl;
correctanswer = number1 * number2;
cin >> studentanswer;
if (studentanswer == correctanswer)
cout << "Correct! Congratulations.\n";
else
cout << "That is incorrect. The correct answer is " << correctanswer << endl;
break;
// Division
case DIVISION_CHOICE:
cout << "Round your answer to two decimal places." <<endl;
cout << number1 << " / " << number2 << " = " << endl;
correctanswer = (float)number1 / number2; // typecast float
cin >> studentanswer;
if (studentanswer<correctanswer+0.05 && studentanswer>correctanswer-0.05)
cout << "Correct! Congratulations.\n";
else
cout << "That is incorrect. The correct answer is " << correctanswer << endl;
break;
// Exit
case QUIT_CHOICE:
exit(0);
break;
// Default
default: cout << "you dudnt enter ya";
}
}while(userchoice != 5);
}
```