how can i make two equal random numbers in c-CodePudding

I'm new to coding and i need help with my project: so, what i need to do is code a "finding the two same cards game", in which every card has a number and we're basically trying to find that two equal numbers. those numbers should be generated with rand() function but i cannot think a way to how to make two random numbers equal to each other if I'm using the rand() function. i don't know if i worded this the best way but i hope you get what i mean and if you don't I'm open to explain it with an example.

thanx in advance!

CodePudding user response：

Just create half as many elements and duplicate them. You can actually take consecutive numbers and shuffle them. This way you make sure every number is repeated exactly once:

int main()
{
   enum { size = 10 };

   int cards[size];

   for (int i = 0; i != size / 2;   i)
   {
      cards[i] = i;
      cards[size/2   i] = i;
   }

   // now shuffle the array
}