Question

I understand, using srand(time(0)), helps in setting the random seed. However, the following code, stores the same set of numbers for two different lists.

Wondering, how do I generate the different set of numbers when the following function gets called more than once.

void storeRandomNos(std::list<int>& dataToStore)
{

    int noofElements = 0;
    srand(time(0));


    noofElements = (rand() % 14 ) + 1;

    while ( noofElements --)
    {
        dataToStore.push_back(rand() % 20 + 1 );
    }
}

Here is the rest of the code.

void printList(const std::list<int>& dataElements, const char* msg);
void storeRandomNos(std::list<int>& dataToStore);
int main()
{
    std::list<int> numberColl1;
    std::list<int> numberColl2;


    storeRandomNos(numberColl1);
    storeRandomNos(numberColl2);

    printList(numberColl1 , "List1");
    printList(numberColl2 , "Second list");


}


void printList(const std::list<int>& dataElements, const char* msg)
{

    std::cout << msg << std::endl;
    std::list<int>::const_iterator curLoc = dataElements.begin();

    for ( ; curLoc != dataElements.end() ; ++curLoc)
    {
        std::cout << *curLoc << ' ';
    }
}

Answer 1

do the srand(time(0)) once at the beginning of your program.