Random pick from array?

Toriac · #1 18-May-2005, 11:29

Hey, I'm writing a program for my C++ class and one of the requirements is an array. I found a way to incorporate an array assuming that you can randomly pick items from it. My question to you guys is, is it possible? If so, can you give an example?

Dr. Evil · #2 18-May-2005, 11:44

CPP / C++ / C Code:

//arr = array, random = random array element
srand(time(NULL));
random = arr[rand() % (sizeof(arr) / sizeof(arr[0]))];
//or if you know the size: arr[rand() % size]

Just so you know, you only need to call srand() once in your program, as proceeding rand()s use the value of the preceeding one as a seed.

Toriac · #3 18-May-2005, 11:49

Quote:

Originally Posted by Dr. Evil

CPP / C++ / C Code:

//arr = array, random = random array element
srand(time(NULL));
random = arr[rand() % (sizeof(arr) / sizeof(arr[0]))];
//or if you know the size: arr[rand() % size]

Just so you know, you only need to call srand() once in your program, as proceeding rand()s use the value of the preceeding one as a seed.

Thanks a lot.

This is exactly what I was looking for.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search
Rate This Thread
Rate This Thread:

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Merge and Heap...which is really faster	silicon	C++ Forum	0	10-May-2005 14:46
Sorting Algorithms by Time	silicon	C++ Forum	4	02-May-2005 22:54
Help with an array using pointers	glulu76	C++ Forum	1	01-May-2005 12:21
template comiling problems - need expert debugger!	crq	C++ Forum	1	01-Feb-2005 22:26