1 files changed, 28 insertions, 0 deletions
diff --git a/challenge-135/ulrich-rieke/cpp/ch-1.cpp b/challenge-135/ulrich-rieke/cpp/ch-1.cpp
new file mode 100644
index 0000000000..098d1b7fee
--- /dev/null
+++ b/challenge-135/ulrich-rieke/cpp/ch-1.cpp
@@ -0,0 +1,28 @@
+#include <iostream>
+#include <string>
+#include <regex>
+
+int main( int argc, char * argv[] ) {
+  std::string input { argv[ 1 ] } ;
+  std::string checkRegex( "(^[+-]*\\d+$)" ) ;
+  std::regex checkReg( checkRegex ) ;
+  while ( ! std::regex_match( input , checkReg ) ) {
+      std::cout << "Input should consist of possible signs and digits only!\n" ;
+      std::getline( std::cin , input ) ;
+  }
+  int len = input.length( ) ;
+  if ( ( len == 4 ) ) {
+      std::string start { input.substr( 0 , 1 ) } ;
+      if ( (start == "+") || ( start == "-" ) )
+    std::cout << input.substr( 1 ) << std::endl ;
+  }
+  else {
+      if ( len % 2 == 0 )
+    std::cout << "even number of digits" << std::endl ;
+      if ( ( len < 3 ) && (  len % 2 != 0 ))
+    std::cout << "too short" << std::endl ;
+      if ( ( len % 2 != 0 ) && ( len > 3 ) )
+    std::cout << input.substr( ( len - 3 ) / 2 , 3 ) << std::endl ;
+  }
+  return 0 ;
+}