iOS Random Integer Generator

[iphoneSDKid]

Hi-
I need a random number generator that creates numbers between 2 numbers, like 10-20, or 20-30, etc.
Thanks!

 

[gr8tfly]

You should try Google "random number generator" for something like this, but:

I don't know Obj-c, but in C++ it would be:

nRandomInteger = (rand() % nMax) + nLower;

If nMax = 10 and nLower = 1, you will get a random number between 1 and 10.

Usually you seed by using

srand((unsigned)time(0));

 

[iphoneSDKid]

dont get it

sorry im very new to this where would i seed the number?

 

[Matthew Yohe]

int num = (arc4random() % 10) + 9;

No seeding required.

 

[gr8tfly]

sorry im very new to this where would i seed the number?

Anywhere prior to using "rand". Or use the OS-X function arc4random as Matthew Yohe posted (I haven't done much OS-X dev - most of the time I've been developing for the "dark side".)

 

[Matthew Yohe]

Anywhere prior to using "rand". Or use the OS-X function arc4random as Matthew Yohe posted (I haven't done much OS-X dev - most of the time I've been developing for the "dark side".)

Keep in mind that ObjC is a strict superset of C. Whatever works in C works in ObjC.

 

[gr8tfly]

Keep in mind that ObjC is a strict superset of C. Whatever works in C works in ObjC.

Yep. I was just assuming the OP was learning ObjC. For me (if I ever get around to Mac/iPhone development), I'd probably naturally resist the transition and use C/C++, which I also used for embedded systems. Old habits dying young and all that...

 

[iphoneSDKid]

int num = (arc4random() % 10) + 9;

No seeding required.

i tried that but i still ocasionally get a number below 10

 

[Matthew Yohe]

i tried that but i still ocasionally get a number below 10

Yeah, as expected. That range would be 9-18.

 

[iphoneSDKid]

my bad

my bad was typing in the wrong view controller lol sry