四舍五入去掉多余浮点数

//自动去掉异常数据，进行四舍五入
-(double)autoRounded:(double)floatNumber{
    double price = floatNumber;
    // NSLog(@"before:%f",price);
    for (int i = 0; i <= 4; i++){
        //  NSLog(@"roundtest:%f",round((price*pow(10,i)))/pow(10,i));
        if (fabs(round((price*pow(10,i)))/pow(10,i) - price)<(0.0001)) {
            price = round((price*pow(10,i)))/pow(10,i);
            //  NSLog(@"rounded:%f",price);
            return price;
        }
    }
    return price;
}