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please help me with this program

glamiex (4)
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?


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#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);
}
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