// 22.5HV2 Software Engineering II
// Unit 3 Exercise 2
#include "imperial.h"

void Imperial::reduce() {
   pounds += ounces/16;
   stones += pounds/14;
   pounds %= 14;
   ounces %= 16;
} 

ostream& operator<<(ostream& ostr, const Imperial& w) {
   return ostr << w.stones << "st. " << w.pounds << "lb. " << w.ounces << "oz.";
}

istream& operator>>(istream& istr, Imperial& w) {
   cout << "Enter stones: ";  istr >> w.stones;
   cout << "Enter pounds: ";  istr >> w.pounds;
   cout << "Enter ounces: ";  istr >> w.ounces;
   return istr;
}

bool operator<(const Imperial &a, const Imperial &b) {
   return (a.stones*224+a.pounds*16+a.ounces < b.stones*224+b.pounds*16+b.ounces);
}

bool operator>(const Imperial &a, const Imperial &b) {
   return (a.stones*224+a.pounds*16+a.ounces > b.stones*224+b.pounds*16+b.ounces);
}

bool operator<=(const Imperial &a, const Imperial &b) {
   return (a.stones*224+a.pounds*16+a.ounces <= b.stones*224+b.pounds*16+b.ounces);
}

bool operator>=(const Imperial &a, const Imperial &b) {
   return (a.stones*224+a.pounds*16+a.ounces >= b.stones*224+b.pounds*16+b.ounces);
}

bool operator==(const Imperial &a, const Imperial &b) {
   return (a.stones*224+a.pounds*16+a.ounces == b.stones*224+b.pounds*16+b.ounces);
}

bool operator!=(const Imperial &a, const Imperial &b) {
   return (a.stones*224+a.pounds*16+a.ounces != b.stones*224+b.pounds*16+b.ounces);
}

Imperial operator+(const Imperial &a, const Imperial &b) {
   return Imperial(a.stones+b.stones,a.pounds+b.pounds,a.ounces+b.ounces);  // Call to constructor will call reduce()
}

Imperial operator-(const Imperial &a, const Imperial &b) {
   int oz = (a.stones*224+a.pounds*16+a.ounces) - (b.stones*224+b.pounds*16+b.ounces);
   if (oz<0) {
      cerr << "Error can't handle -ve weights!" << endl;
      return Imperial(0,0,0);
   }
   else 
      return Imperial(0,0,oz);  // Call to constructor will call reduce()
}