Question

我试图在两个浮点数之间生成一个随机数（最大值增加一半）

这是我到目前为止所做的，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;

Answer 2

当然是：

float randomNumber = ((float)arc4random() / ARC4RANDOM_MAX * (maxRange - minRange)) + minRange;

两个浮点数之间的随机数生成

2 个答案: