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

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

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 ())