added the project files

projects/randomNumberGeneratorExamples/shuffle.cc

@@ -0,0 +1,53 @@
+/*
+ * Example of using the <algorithm> std::shuffle and seeding a random number generator with either
+ * the command-line argument provided seed integer, or the current system time if there is no
+ * argument provided. Based off of the example at: 
+ *
+ *    http://www.cplusplus.com/reference/algorithm/shuffle/
+ *
+ *  Last updated: 2020-10-06
+ *  Copyright 2020 UW. All rights reserved.
+ *
+ */
+ // 
+#include <iostream>
+#include <string>
+#include <stdexcept>
+#include <vector>
+#include <algorithm>
+#include <random>
+#include <chrono>
+
+void print( std::vector<int> const & v ) {
+	for ( int i : v ) std::cout << i << ' ';
+	std::cout << std::endl;
+}
+
+int main( int argc, char * argv[] ) {
+	std::vector<int> v = { 1, 2, 3, 4, 5, 6, 7, 8, 9 };
+
+	// use a time-based seed for the default seed value
+	unsigned seed = std::chrono::system_clock::now().time_since_epoch().count();
+	
+	if ( argc > 1 ) {
+		try {
+			seed = std::stoi( std::string{ argv[1] } );
+		} catch( std::invalid_argument & e ) {
+			std::cerr << e.what() << std::endl;
+			return 1;
+		} catch( std::out_of_range & e ) {
+			std::cerr << e.what() << std::endl;
+			return -1;
+		} // catch
+	} // if
+
+	std::default_random_engine rng{seed};
+
+	for ( int i = 0; i < 1000; i++ ) {
+		//std::shuffle( v.begin(), v.end(), std::default_random_engine(seed) );
+		std::shuffle( v.begin(), v.end(), rng );
+		print(v);		
+	} // for
+
+	return 0;
+} // main