4 files changed, 97 insertions, 0 deletions
diff --git a/Tests/Tutorial/Step6/MathFunctions/CMakeLists.txt b/Tests/Tutorial/Step6/MathFunctions/CMakeLists.txt
new file mode 100644
index 0000000..70a35f6
--- /dev/null
+++ b/Tests/Tutorial/Step6/MathFunctions/CMakeLists.txt
@@ -0,0 +1,24 @@
+# first we add the executable 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 MathFunctions DESTINATION bin)
+install (FILES MathFunctions.h DESTINATION include)
diff --git a/Tests/Tutorial/Step6/MathFunctions/MakeTable.cxx b/Tests/Tutorial/Step6/MathFunctions/MakeTable.cxx
new file mode 100644
index 0000000..cebd50f
--- /dev/null
+++ b/Tests/Tutorial/Step6/MathFunctions/MakeTable.cxx
@@ -0,0 +1,32 @@
+// A simple program that builds a sqrt table
+#include <math.h>
+#include <stdio.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;
+  }
+
+  // create a source file with a table of 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/Step6/MathFunctions/MathFunctions.h b/Tests/Tutorial/Step6/MathFunctions/MathFunctions.h
new file mode 100644
index 0000000..cd36bcc
--- /dev/null
+++ b/Tests/Tutorial/Step6/MathFunctions/MathFunctions.h
@@ -0,0 +1 @@
+double mysqrt(double x);
diff --git a/Tests/Tutorial/Step6/MathFunctions/mysqrt.cxx b/Tests/Tutorial/Step6/MathFunctions/mysqrt.cxx
new file mode 100644
index 0000000..458ed63
--- /dev/null
+++ b/Tests/Tutorial/Step6/MathFunctions/mysqrt.cxx
@@ -0,0 +1,40 @@
+#include "MathFunctions.h"
+#include "TutorialConfig.h"
+#include <stdio.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;
+}