随机数字生成两个花车之间 [英] random number generation between two floats

问题描述

我试图在两个浮点数之间生成一个随机数（最大值增加了一半）

这是我迄今为止的，但它不工作

  // range 
 NSString * minString = [dict objectForKey：@min]; 
 float minRange = [minString floatValue]; 
 NSString * maxString = [dict objectForKey：@max]; 
 float maxRange = [maxString floatValue]; 
 
 NSLog（@ORIGINAL range is％f  - ％f，minRange，maxRange）; 
 
 maxRange = maxRange +（maxRange / 2）; 
 
 //如果你想得到一个在x到y范围内的随机整数，你可以通过int randomNumber =（arc4random（）％y）+ x来实现。 
 
 float randomNumber =（arc4random（）％maxRange）+ minRange; //错误：对二进制表达式无效的操作数（'float'和'float'）
 
 NSLog（@范围是％f  - ％f，minRange，maxRange）; 
 NSLog（@random number is％f，randomNumber）; 
  

解决方案

  #define ARC4RANDOM_MAX 0x100000000 
   
 
然后试试这个： 
 
 
  double val =（（double）arc4random （）/ ARC4RANDOM_MAX）
 *（maxRange  -  minRange）
 + minRange; 
  
 
I am trying to generate a random number between two floats (the max is increased by its half) 


this is what I have so far but it's not working 
    //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);

解决方案
Include:
#define ARC4RANDOM_MAX 0x100000000
And then try this:
double val = ((double)arc4random() / ARC4RANDOM_MAX) 
   * (maxRange - minRange)
   + minRange;


                        
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