finished hw7

Hw7&8/main.cpp

@@ -0,0 +1,75 @@
+#include "weight.hpp"
+
+#include <iomanip>
+#include <iostream>
+
+// ------------------------------------------------------------------
+//
+// Operator overloading, various constructors, more templates, etc
+//
+// ------------------------------------------------------------------
+int main()
+{
+  usu::microgram mcg(1000000);
+  usu::gram g = usu::weight_cast<usu::gram>(mcg);
+  usu::pound lb = usu::weight_cast<usu::pound>(g);
+  usu::ounce oz = usu::weight_cast<usu::ounce>(lb);
+  usu::ton ton = usu::weight_cast<usu::ton>(lb);
+
+  std::cout << std::fixed << std::setprecision(10);
+  std::cout << "--- From micrograms ---" << std::endl;
+  std::cout << "micrograms : " << mcg.count() << std::endl;
+  std::cout << "grams      : " << g.count() << std::endl;
+  std::cout << "lbs        : " << lb.count() << std::endl;
+  std::cout << "ounces     : " << oz.count() << std::endl;
+  std::cout << "tons       : " << ton.count() << std::endl;
+
+  usu::pound somePounds(2000);
+  usu::microgram ugFromPounds = usu::weight_cast<usu::microgram>(somePounds);
+  usu::gram gramsFromPounds = usu::weight_cast<usu::gram>(somePounds);
+  usu::ounce ouncesFromPounds = usu::weight_cast<usu::ounce>(somePounds);
+  usu::ton tonsFromPounds = usu::weight_cast<usu::ton>(ouncesFromPounds);
+
+  std::cout << std::endl
+            << "--- From pounds ---" << std::endl;
+  std::cout << "micrograms : " << ugFromPounds.count() << std::endl;
+  std::cout << "grams      : " << gramsFromPounds.count() << std::endl;
+  std::cout << "lbs        : " << somePounds.count() << std::endl;
+  std::cout << "ounces     : " << ouncesFromPounds.count() << std::endl;
+  std::cout << "tons       : " << tonsFromPounds.count() << std::endl;
+
+  std::cout << std::endl
+            << "--- Operator Overloading ---" << std::endl;
+  {
+    usu::pound a(1);
+    usu::pound b(0.5);
+    usu::pound c = a + b;
+    std::cout << std::setprecision(2);
+    std::cout << "(pound + pound) : " << a.count() << " + " << b.count() << " = " << c.count();
+    std::cout << " ==> grams: " << usu::weight_cast<usu::gram>(c).count() << std::endl;
+  }
+
+  {
+    usu::pound a(1);
+    usu::pound b(0.5);
+    usu::pound c = a - b;
+    std::cout << std::setprecision(2);
+    std::cout << "(pound - pound) : " << a.count() << " - " << b.count() << " = " << c.count();
+    std::cout << " ==> grams: " << usu::weight_cast<usu::gram>(c).count() << std::endl;
+  }
+
+  {
+    usu::pound a(1);
+    usu::pound b = a * 2.2;
+    usu::pound c = 3.2 * a;
+    std::cout << std::setprecision(2);
+    std::cout << "(pound * scalar) : " << a.count() << " * 2.2 "
+              << " = " << b.count();
+    std::cout << " ==> grams: " << usu::weight_cast<usu::gram>(b).count() << std::endl;
+
+    std::cout << "(scalar * pound) : 3.2 * " << a.count() << " = " << c.count();
+    std::cout << " ==> grams: " << usu::weight_cast<usu::gram>(c).count() << std::endl;
+  }
+
+  return 0;
+}