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extern/stdcxx/4.2.1/examples/tutorial/sieve.cpp

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+/**************************************************************************
+ *
+ * sieve.cpp - Prime numbers sieve program.
+ *
+ * $Id: sieve.cpp 550991 2007-06-26 23:58:07Z sebor $
+ *
+ ***************************************************************************
+ *
+ * Licensed to the Apache Software  Foundation (ASF) under one or more
+ * contributor  license agreements.  See  the NOTICE  file distributed
+ * with  this  work  for  additional information  regarding  copyright
+ * ownership.   The ASF  licenses this  file to  you under  the Apache
+ * License, Version  2.0 (the  "License"); you may  not use  this file
+ * except in  compliance with the License.   You may obtain  a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the  License is distributed on an  "AS IS" BASIS,
+ * WITHOUT  WARRANTIES OR CONDITIONS  OF ANY  KIND, either  express or
+ * implied.   See  the License  for  the  specific language  governing
+ * permissions and limitations under the License.
+ *
+ * Copyright 1994-2006 Rogue Wave Software.
+ * 
+ **************************************************************************/
+
+#include <vector>
+#include <iostream>
+
+#include <examples.h>
+    
+int main ()
+{
+
+    std::cout << "Prime Sieve program, a test of vectors" << std::endl;
+
+    // Create a sieve of bits, initially set to 1.
+    const int sievesize = 100;
+    std::vector<int, std::allocator<int> > sieve ((std::size_t)sievesize, 1);
+
+    // At positions that are multiples of i, set value to zero.
+    for (int i = 2; i * i < sievesize; i++)
+        if (sieve[i])
+            for (int j = i + i; j < sievesize; j += i)
+                sieve[j] = 0;
+
+    // Now output all the values that are still set.
+    for (int j = 2; j < sievesize; j++)
+        if (sieve[j]) 
+            std::cout << j << " ";
+    
+    std::cout << std::endl << "End of Prime Sieve program" << std::endl;
+
+    return 0;
+}