两个数之间的随机数

num1与num2之间的随机数

-(float)randomFloatBetween:(float)num1 andLargerFloat:(float)num2
{
    int startVal = num1*10000;
    int endVal = num2*10000;
    
    int randomValue = startVal +(arc4random()%(endVal - startVal));
    float a = randomValue;
    
    return(a /10000.0);
}