random numbers

[Micko]

How can I generate random numbers on interval [0-N]?
I used Turbo C before and used random() function, but here I can use rand() and in that case numbers are integeres but don't konw what is upper limit
Thanks

[Hammer]

Start here

[Magos]

With risk of spoiling Hammer's attempt to make you read the FAQ, you should use the modulus operator %. It returns the remainder of an integer division.

int GetRandomNumberFromZeroToN(int N)
{
  return rand() % (N + 1);
}

Doing modulus with N gives a number between 0 and N-1, so you want to do modulus with N + 1 to get a number between 0 and N.