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Explore exercises that deepen your understanding of C++ literals by extending the MyDistance class to include feet and miles units. Learn to implement calculations combining multiple distances in meters and kilometers, enhancing your practical skills with user-defined types.

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Exercise 1 #

Extend the MyDistance class we saw in the previous lesson to support the following units:

  • Feet: 1 ft = 0.3048m

  • Mile: 1 mi = 1609.344m

Choose good suffixes for these units.

Write an implementation below:

C++
#include <iostream>
#include <ostream>
namespace Distance{
  class MyDistance{
    public:
      MyDistance(double i):m(i){}
      friend MyDistance operator +(const MyDistance& a, const MyDistance& b){
        return MyDistance(a.m + b.m);
      }
      friend MyDistance operator -(const MyDistance& a, const MyDistance& b){
        return MyDistance(a.m - b.m);
      }
      friend std::ostream& operator<< (std::ostream &out, const MyDistance& myDist){
        out << myDist.m << " m";
         return out;
      }
    private:
      double m;
  };
  namespace Unit{
    MyDistance operator "" _km(long double d){
      return MyDistance(1000*d);
    }
    MyDistance operator "" _m(long double m){
      return MyDistance(m);
    }
    MyDistance operator "" _dm(long double d){
      return MyDistance(d/10);
    }
    MyDistance operator "" _cm(long double c){
      return MyDistance(c/100);
    }
  }
}
using namespace Distance::Unit;
int main(){
  std:: cout << std::endl;
  std::cout << "1.0_km: " << 1.0_km << std::endl;
  std::cout << "1.0_m: " << 1.0_m << std::endl;
  std::cout << "1.0_dm: " << 1.0_dm << std::endl;
  std::cout << "1.0_cm: " << 1.0_cm << std::endl;
  std::cout << std::endl;
  std::cout << "1.0_km + 2.0_dm +  3.0_dm - 4.0_cm: " << 1.0_km + 2.0_dm +  3.0_dm - 4.0_cm << std::endl;
  std::cout << std::endl;
}

Exercise 2

The total distance of someone’s weekly drive consists of many components. Extend MyDistance so that we can calculate the total distance based on the following formula:

myDistPerWeek=4∗work∗2 ...