add Chapter01 examples

Chapter01/exceptions.cpp

@@ -0,0 +1,31 @@
+#include <cstdio>
+
+struct A {
+  A() { printf("A is created!\r\n"); }
+  ~A() { printf("A is destroyed!\r\n"); }
+};
+
+struct B {
+  B() { printf("B is created!\r\n"); }
+  ~B() { printf("B is destroyed!\r\n"); }
+};
+
+void bar() {
+  B b;
+  throw 0;
+}
+
+void foo() {
+  A a;
+  bar();
+  A a1;
+}
+
+int main() {
+  try {
+    foo();
+  } catch (int &p) {
+    printf("Catching an exception!\r\n");
+  }
+  return 0;
+}