rand() / srand() 一直给我零

Question

I have 2 functions that generate random numbers (first function generates 5 random sets, second function only one. I called srand(time(NULL)) in the first one, and by doing so I didn't have to call it again in the second function.

Problem is, for the second function I keep getting zero (first function is fine). Here are the two functions (these are snippets of the entire code, too long to post it all, unless you guys would need it let me know).

Edit: I #included < ctime > if you're curious, so that's not the issue.

 int Winning_Numbers(int generated[])
 {
     int amount = 5;
     int winning_ticket = generated[amount];

     srand(time(NULL));

     for(int x = 0; x < amount; x++)
     {
         generated[x] = (rand() % 69) + 1;

         while (generated[x] < 1 || generated[x] > 69)
         {
             generated[x] = (rand() % 10) + 1;
         }

         if (x > 0)
         {
             for(int check_number = 0; check_number < x; check_number++)
             {
                 while (generated[x] == generated[check_number])
                 {
                     generated[x] = (rand() % 10) + 1;
                 }
             }
         }
     }

     return winning_ticket;
 }

 int Powerball(int powerball_generated)
 {
     powerball_generated = (rand() % 26) + 1;

     if (powerball_generated < 1 || powerball_generated > 26)
     {
         powerball_generated = (rand() % 10) + 1;
     }

     return powerball_generated;
 }

Answer 1

Your code has lots of little problems, but the one you're asking about is that in your main function you have

int powerball_number;
Powerball(powerball_number);

Here you are passing the value of powerball_number to the Powerball() function as an argument. But what you want to do is have Powerball() return a value and assign that to the powerball_number variable. So you should write

powerball_number = Powerball();

instead. Also change the Powerball() function to just

int Powerball()

since it doesn't need to take an argument at all.

As a side note, it's much easier for answerers if you can show a small but complete piece of code, that shows your problem, right in your question. Here, the key to your problem showed only in the pastebin fragment, the link to which was hiding in one of the comments, and which it took me a while to find..