1 files changed, 42 insertions, 0 deletions
diff --git a/challenge-308/ulrich-rieke/cpp/ch-2.cpp b/challenge-308/ulrich-rieke/cpp/ch-2.cpp
new file mode 100755
index 0000000000..8a80cf6fc5
--- /dev/null
+++ b/challenge-308/ulrich-rieke/cpp/ch-2.cpp
@@ -0,0 +1,42 @@
+#include <iostream>
+#include <string>
+#include <sstream>
+#include <vector>
+
+std::vector<std::string> split( const std::string & text , char delimiter ) {
+   std::vector<std::string> tokens ;
+   std::istringstream istr { text } ;
+   std::string word ;
+   while ( std::getline( istr , word , delimiter ) ) {
+      tokens.push_back( word ) ;
+   }
+   return tokens ;
+}
+
+int main( ) {
+   std::cout << "Enter some numbers separated by whitespace!\n" ;
+   std::string line ;
+   std::getline( std::cin , line ) ;
+   auto tokens { split( line , ' ' ) } ;
+   std::vector<int> encoded ;
+   for ( auto s : tokens ) 
+      encoded.push_back( std::stoi( s ) ) ;
+   std::cout << "Enter an initial integer!\n" ;
+   int initial ;
+   std::cin >> initial ;
+   std::vector<int> decoded ;
+   decoded.push_back( initial ) ;
+   //to find x in a xor x = b you can do a xor b since xor is its own 
+   //inverse function!
+   for ( auto it = encoded.begin( ) ; it != encoded.end( ) ; ++it ) {
+      int last = decoded[decoded.size( ) - 1] ;
+      decoded.push_back( last ^ *it ) ;
+   }
+   std::cout << "( " ;
+   for ( int i : decoded ) {
+      std::cout << i << ' ' ;
+   }
+   std::cout << ")\n" ;
+   return 0 ;
+}
+