Use of random numbers in objective-c

1) arc4random () is more accurate and does not need to be generated immediately.

Usage:

The code for getting an integer between 0 and X-1 through arc4random () is as follows:

IntValue=Arc4random ()%X;

The code for getting an integer between 1 and x is as follows:

IntValue=(Arc4random ()%X)+1;

2). It is used in CCRANDOM_0_1 () cocos2d and the range is [0, 1].

Usage:

Float random = CCRANDOM_0_1 () * 5; // [] CCRANDOM_0_1 () value range: []

3) set the seed when random () needs Initialization

Usage:

Srandom (unsigned int) time (time_t *) NULL); // set the seed during initialization.

4). arc4random_uniform

During the development of iOS games, I always felt that there was a problem with the random number produced by arc4random, and the resulting values were not balanced. Today, we finally found another arc4random_uniform function, which is also in the C standard library. This problem is improved and a balanced random number is generated. Therefore, it is replaced globally.