How the generated random number with no duplicates

Question

have to make 6 random numbers generate 10 times in 1 run to show there are no duplicates

Answer 1

Have you seen - http://en.cppreference.com/w/cpp/numeric/random ? They've added some new functionality in C++ 11, now you can pick the distribution of the random numbers (uniform_int_distribution in your case I'm guessing).

If you really want there to be no duplicates you can put every generated number in std::set and if your new random number is already in that set - keep regenerating it, until it isn't. Something like this:

static std::set<int> numbersAlreadyGenerated;

int generateNonRepeatingRandomNumber()
{
int randomNumber;

do{
randomNumber = generateRandom();
}while (numbersAlreadyGenerated.find(randomNumber) != numbersAlreadyGenerated.end());

numbersAlreadyGenerated.insert(randomNumber);

return randomNumber;
}