Thread: rand() trouble

I'm having a bit of trouble using the random function rand(). It does kinda generate random numbers but its always the same numbers in the same order when the program starts. I read about this somewhere before but i couldnt get anything from searching the forum. The header i am using is just iostream.

Heres where I am using the function:

Code:

y = (rand() % difficulty);

I want a random number between 1 and whatever difficulty is set to (which I have been setting it to 10 when I have been using it).

Please help!

Originally Posted by -Dan-

I'm having a bit of trouble using the random function rand(). It does kinda generate random numbers but its always the same numbers in the same order when the program starts. I read about this somewhere before but i couldnt get anything from searching the forum. The header i am using is just iostream.

Heres where I am using the function:

Code:

y = (rand() % difficulty);

I want a random number between 1 and whatever difficulty is set to (which I have been setting it to 10 when I have been using it).

Please help!

You need to use the srand() function to seed the random number generator. The most common way to do this is:

Code:

srand((unsigned int)time(NULL));

rand() is not a true random number generator, so if you don't seed it you certainly won't get a different sequence every time.

Aaaah cheers!