Help with randoms

int main () 
{
    int choice = 0,first = 0,second = 0,answer = 0,rand1 = 0,rand2 = 0,correct = 0;
    int seed;//random number generator.
    float percentage = 0.0;
    char finish;
    do
    {
    cout<<"Please choose a function\n"
        <<"1] Addition\n"
        <<"2] Subtraction\n"
        <<"3] Division\n"
        <<"4] Multiplication\n";
    cin>>choice;
    if(choice == 1)
    {
              seed = time(NULL);
              srand(seed);//generator
              rand1 = rand() % 1000 + 1;
              rand2 = rand() % 1000 + 1;
              do
              {
                    cout<<rand1<<" + "<<rand2<<" = ";
                    cin>>answer;
                    if(answer == (rand1 + rand2))
                    {
                              correct = 1;
                              }
                              }
                              while(correct == 0);
                              cout<<answer<<" is correct.\n";
              }
              cout<<"Would you like to choose another function (Y/N): ";
              cin>>finish;
              }
              while(finish == 'Y' && finish == 'y');
    system("Pause");
    return 0;
}