Thread: Help with this program

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?

Code:

#include<iostream>
#include<cstdlib>
#include<ctime>
#include<iomanip>
#include<fstream>
usingnamespace 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
constint 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();
return0;
}
//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
unsignedint number1 =0;
unsignedint 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 didn't enter a valid number;
}
}while(userchoice !=5)