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我怎么用飞镖计算这个数学?

dart math

BIS Tech · 技术社区 · 6 年前

总方向=1540m

第一公里=10美元

第2公里=8美元

其他(正常)公里=5美元

我如何计算这个逻辑?用户应支付10美元的第一公里,然后2ns公里8美元,其他5美元。 model.startUpCharge 是阵列,存储10美元和8美元

/// [totalDistance] is in meters
double calculateTripPrice(RideModel model, double totalDistance) {
  double totalPrice = 0;
  double standardPrice = 0;

  totalPrice = model.normalCharge *
      ((totalDistance / 1000) - model.startUpCharge.length);
  for (var i = 0; i < model.startUpCharge.length; i++) {
    standardPrice = standardPrice + model.startUpCharge[i];
  }
  totalPrice = totalPrice + standardPrice;
  return totalPrice;
}

@CreativeCreatorMayben不回答

问题是:如果我加1米,价格应该是50。第一公里开始充电。不会改变

import 'dart:math' as math;

class RideModel{
  final List startUpCharge;
  final double normalCharge;

  RideModel({this.startUpCharge,this.normalCharge});
}
main() {
 calculateTripPrice(RideModel(startUpCharge: [50,51],normalCharge: 10),1);
}

double calculateTripPrice(RideModel model, double totalDistance) {
  var remainingDistance = totalDistance, price = .0;

  // Kilometers with special charge
  for (var i = 0; i < model.startUpCharge.length; i++) {
    price += model.startUpCharge[i] / 1000 * math.min(1000, remainingDistance);
    remainingDistance -= math.min(1000, remainingDistance);
  }

  // Remaining kilometers
  price += model.normalCharge / 1000 * remainingDistance;
  remainingDistance = 0;
  print(price);

  return price;
}

0 回复 | 直到 6 年前

creativecreatorormaybenot 6 年前

你可以简单地重复增加你的价格和减去距离。基于此,只有在还有剩余距离且每次都使用正确的系数时才会加价。

double calculateTripPrice(RideModel model, double totalDistance) {
  var remainingDistance = totalDistance, price = .0;

  // Kilometers with special charge
  for (var i = 0; i < model.startUpCharge.length; i++) {
    price += model.startUpCharge[i] / 1000 * math.min(1000, remainingDistance);
    remainingDistance -= math.min(1000, remainingDistance);
  }

  // Remaining kilometers
  price += 5 / 1000 * remainingDistance;
  remainingDistance = 0;

  return price;
}

记住 import 'dart:math' as math;