Study results from Stroustrup's PPP3 book.

PPP3/ex01.cpp

@@ -0,0 +1,17 @@
+#include <iostream>
+
+using namespace std;
+
+int main()
+{
+  constexpr double pi = 3.14159;
+  double d = 0;
+  while(cin >> d) {
+    int i = d;
+    char c = i;
+    cout << "d==" << d
+      << " i==" << i
+      << " c==" << c
+      << " char(" << c << ")\n";
+  }
+}