Code 1

#include <iostream>
#include <cstdlib>
#include <ctime>
#include <cstdio>
using namespace std;

int main()
{
  char loop; // Decalres loop in the proper scope.
  srand(time(NULL)); // Initializes random number generator.

    int ran1, ran2, result, guess = 120, tries = 0, choice = 0; // Decelares variables for program.
      // guess is set to 11 so the while statement will never be true on first run.
      // Tries is reset to zero for loop.
    bool valid = false;
    const int maxtries = 3; // Sets a constant for the maximum number of tries.

  do //Start program loop
  {
    loop = 'z';  // Resets loop variable.
    guess = 120; // Resets Guess.
    tries = 0; // Resets Tries counter.
    result = ran1 * ran2; // Calculates the results for comparison.

    cout << "Welome to math helper! What difficulty would you like to play at?\n";

  do
  {
    cout << "(1) Hard: 0-10\n(2)Medium: 0-7\n(3)Easy: 0-5\n";
    cin >> choice;

    if (choice == 1)
    {
      ran1 = rand()%11; // Finds first random number between 1 and 10.
      ran2 = rand()%11; // Finds second random number between 1 and 10.
    }

    if (choice == 2)
    {
      ran1 = rand()%8; // Finds first random number between 1 and 10.
      ran2 = rand()%8; // Finds second random number between 1 and 10.
    }

    if (choice == 3)
    {
      ran1 = rand()%5; // Finds first random number between 1 and 10.
      ran2 = rand()%5; // Finds second random number between 1 and 10.
    }
    if ((choice != 1) || (choice != 1) || (choice != 1))
      cout << "Please enter a valid value!\n";
  }
  while ((choice != 1) || (choice != 1) || (choice != 1));

    cout << "Try to solve the problem!\n"; // Provides instruction to the user.

    while ((result != guess) && (tries < maxtries))
      // Starts loop that will run until the user answers correctly or maxtries is exceeded.
    {
    valid = false;
    while (!valid)
    {
      cout << ran1 << " x " << ran2 << " = "; // Displays equation
      cin >> guess;
      valid = true;

      if (cin.peek() != '\n' || cin.fail())
      {
        valid = false;
        cin.clear();
        cin.ignore(100, '\n');
        cout << "Enter a valid integer.\n" << ran1 << " x " << ran2 << " = "; // Displays equationendl;
      }
    }
    }
    tries = tries + 1; // Adds one to the tries counter
    }

    if (result == guess) // Checks to see for the correct answer after loop.
      cout << "You win!\n"; // Tells user they're a winner.
    else // If they are not correct, logic dictates they must be wrong.
      cout << "You lose!\n"; // Tells user they don't math goodly.

    while ((loop != 'n') && (loop != 'N') && (loop != 'Y') && (loop != 'y'))
    {
      cout << "\nDo you want to play again? (Y/N) "; // Asks user if they want to start again.
      cin >> loop; // Stores answer.
      if ((loop != 'n') && (loop != 'N') && (loop != 'Y') && (loop != 'y'))
    cout << "Invalid input. Please try again.\n";
    }
}
  while ((loop == 'y') || (loop == 'Y')); // If answer was upper or lower case y, the program loops.
}