Use of random numbers in Objective-c (3 types: Arc4random (), Random (), ccrandom_0_1 ())

Source: Internet
Author: User

1, the use of random numbers

1), arc4random () more precise do not need to generate the seed immediately

How to use:

The code for obtaining an integer between 0 and X-1 by Arc4random () is as follows:

int Value = arc4random()% x;


The code to get an integer between 1 and X is as follows:

int value = (arc4random ()% x) + 1;

2), ccrandom_0_1 () cocos2d use, range is [0,1]

How to use:

float random = ccrandom_0_1 () * 5; [0,5] Ccrandom_0_1 () value range is [0,1]

3), random () set seed when initialization is required

How to use:

Srandom ((unsigned int) time (time_t *) NULL); When initializing, set the seed to be OK.

Use of random numbers in Objective-c (3 types: Arc4random (), Random (), ccrandom_0_1 ())

Related Article

Contact Us

The content source of this page is from Internet, which doesn't represent Alibaba Cloud's opinion; products and services mentioned on that page don't have any relationship with Alibaba Cloud. If the content of the page makes you feel confusing, please write us an email, we will handle the problem within 5 days after receiving your email.

If you find any instances of plagiarism from the community, please send an email to: info-contact@alibabacloud.com and provide relevant evidence. A staff member will contact you within 5 working days.

A Free Trial That Lets You Build Big!

Start building with 50+ products and up to 12 months usage for Elastic Compute Service

  • Sales Support

    1 on 1 presale consultation

  • After-Sales Support

    24/7 Technical Support 6 Free Tickets per Quarter Faster Response

  • Alibaba Cloud offers highly flexible support services tailored to meet your exact needs.