int choice ; 
    cin >> choice;
    do {
     int r, r2, answerplus, answersubtract;
     r = rand() % 8 + 1;  
     r2 = rand() % 8 + 1; 
     answerplus = r + r2;
     out << "question number " << questionumber << endl;
     cout << r <<  "+ __ = " << answerplus << endl;
 
      int responce; 
     cin >> responce;
 
     if (responce == r2)  {cout << "correct!" << endl;
     score = score + 1; }
     else {cout << "wrong!" << endl; }
     questionumber = questionumber + 1;
     cout << "your score is " << score << endl;
 while (questionumber <= 10);

#include <cstdlib>
#include <ctime>
#include <iostream>
 
int main()
{
  using namespace std;
 
  srand(unsigned(time(0)));
 
  while (true) {
    int lhs = rand() % 8 + 1;
    int rhs = rand() % 8 + 1;
    int answer;
    char op;
 
    // Choose equally between + and -
    if (rand() % 2 == 0) {
      answer = lhs + rhs;
      op = '+';
    }
    else {
      answer = lhs - rhs;
      op = '-';
    }
 
    cout << lhs << ' ' << op << " __ = " << answer << "\n>";
 
    int choice;
 
    if (!(cin >> choice))
      break;
 
    if (choice == rhs)
      cout << "Correct!\n";
    else
      cout << "Incorrect, the answer is " << rhs << '\n';
  }
}