objective-c - 两个 float 之间的随机数生成

Question

我试图在两个 float 之间生成一个随机数(最大值增加一半)

这是我目前所拥有的，但它不起作用

    //range
    NSString *minString = [dict objectForKey:@"min"];
    float minRange = [minString floatValue];
    NSString *maxString = [dict objectForKey:@"max"];
    float maxRange = [maxString floatValue];

    NSLog(@"the ORIGINAL range is %f - %f", minRange, maxRange);

    maxRange = maxRange + (maxRange/2);

    //If you want to get a random integer in the range x to y, you can do that by int randomNumber = (arc4random() % y) + x;

    float randomNumber = (arc4random() % maxRange) + minRange; //ERROR: "Invalid operands to binary expression ('float' and 'float')

    NSLog(@"the range is %f - %f", minRange, maxRange);
    NSLog(@"the random number is %f", randomNumber);

Answer 1

包括:

#define ARC4RANDOM_MAX 0x100000000

然后试试这个:

double val = ((double)arc4random() / ARC4RANDOM_MAX) 
   * (maxRange - minRange)
   + minRange;