4 files changed, 104 insertions, 0 deletions
diff --git a/Tests/Tutorial/Step5/MathFunctions/CMakeLists.txt b/Tests/Tutorial/Step5/MathFunctions/CMakeLists.txt
new file mode 100644
index 0000000..7dc4d82
--- /dev/null
+++ b/Tests/Tutorial/Step5/MathFunctions/CMakeLists.txt
@@ -0,0 +1,24 @@
+# first we add the exetuable that generates the table
+add_executable(MakeTable MakeTable.cxx)
+
+# add the command to generate the source code
+add_custom_command (
+  OUTPUT ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  DEPENDS MakeTable
+  COMMAND MakeTable
+  ARGS ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  )
+
+set_source_files_properties (
+  mysqrt.cxx PROPERTIES 
+  OBJECT_DEPENDS ${CMAKE_CURRENT_BINARY_DIR}/Table.h
+  )
+
+# add the binary tree directory to the search path for include files
+include_directories( ${CMAKE_CURRENT_BINARY_DIR} )
+
+# add the main library
+add_library(MathFunctions mysqrt.cxx)
+
+install_targets (/bin MathFunctions)
+install_files (/include FILES MathFunctions.h)
diff --git a/Tests/Tutorial/Step5/MathFunctions/MakeTable.cxx b/Tests/Tutorial/Step5/MathFunctions/MakeTable.cxx
new file mode 100644
index 0000000..23fa7d4
--- /dev/null
+++ b/Tests/Tutorial/Step5/MathFunctions/MakeTable.cxx
@@ -0,0 +1,35 @@
+// A simple program that builds a sqrt table 
+#include <stdio.h>
+#include <math.h>
+
+int main (int argc, char *argv[])
+{
+  int i;
+  double result;
+
+  // make sure we have enough arguments
+  if (argc < 2)
+    {
+    return 1;
+    }
+  
+  // open the output file
+  FILE *fout = fopen(argv[1],"w");
+  if (!fout)
+    {
+    return 1;
+    }
+  
+  // crate a source file with a tabel fo square roots
+  fprintf(fout,"double sqrtTable[] = {\n");
+  for (i = 0; i < 10; ++i)
+    {
+    result = sqrt(static_cast<double>(i));
+    fprintf(fout,"%g,\n",result);
+    }
+
+  // close the table with a zero
+  fprintf(fout,"0};\n");
+  fclose(fout);
+  return 0;
+}
diff --git a/Tests/Tutorial/Step5/MathFunctions/MathFunctions.h b/Tests/Tutorial/Step5/MathFunctions/MathFunctions.h
new file mode 100644
index 0000000..cd36bcc
--- /dev/null
+++ b/Tests/Tutorial/Step5/MathFunctions/MathFunctions.h
@@ -0,0 +1 @@
+double mysqrt(double x);
diff --git a/Tests/Tutorial/Step5/MathFunctions/mysqrt.cxx b/Tests/Tutorial/Step5/MathFunctions/mysqrt.cxx
new file mode 100644
index 0000000..33659b7
--- /dev/null
+++ b/Tests/Tutorial/Step5/MathFunctions/mysqrt.cxx
@@ -0,0 +1,44 @@
+#include <stdio.h>
+#include "MathFunctions.h"
+#include "TutorialConfig.h"
+
+// include the generated table
+#include "Table.h"
+
+#include <math.h>
+
+// a hack square root calculation using simple operations
+double mysqrt(double x)
+{
+  if (x <= 0)
+    {
+    return 0;
+    }
+  
+  double result;
+
+  // if we have both log and exp then use them
+  double delta;  
+
+  // use the table to help find an initial value
+  result = x;
+  if (x >= 1 && x < 10)
+    {
+    result = sqrtTable[static_cast<int>(x)];
+    }
+
+  // do ten iterations
+  int i;
+  for (i = 0; i < 10; ++i)
+    {
+    if (result <= 0)
+      {
+      result = 0.1;
+      }
+    delta = x - (result*result);
+    result = result + 0.5*delta/result;
+    fprintf(stdout,"Computing sqrt of %g to be %g\n",x,result);
+    }
+
+  return result;
+}