[Assorted-commits] SF.net SVN: assorted: [598] sandbox/trunk/src/cc/scopes.cc

[<yan...@us...>]

Revision: 598
          http://assorted.svn.sourceforge.net/assorted/?rev=598&view=rev
Author:   yangzhang
Date:     2008-03-03 20:11:53 -0800 (Mon, 03 Mar 2008)

Log Message:
-----------
added scoping demo

Added Paths:
-----------
    sandbox/trunk/src/cc/scopes.cc

Added: sandbox/trunk/src/cc/scopes.cc
===================================================================
--- sandbox/trunk/src/cc/scopes.cc	                        (rev 0)
+++ sandbox/trunk/src/cc/scopes.cc	2008-03-04 04:11:53 UTC (rev 598)
@@ -0,0 +1,24 @@
+// Demonstrate the scoping of control structures. Before, I thought that only
+// for loops had this kind of scoping.
+
+#include <iostream>
+using namespace std;
+
+int
+main()
+{
+  if (int x = 1) {
+    cout << "true " << x << endl; // This is printed, as expected.
+  } else {
+    cout << "false " << x << endl;
+  }
+  // The following doesn't work; x is out of scope.
+  // cout << x << endl;
+
+  // Here, the initialization to 1 occurs on each iteration.
+  while (int x = 1) {
+    cout << x-- << endl;
+  }
+
+  return 0;
+}


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