CMake tutorial step1 added.

c/cmake_tutorial/step1/CMakeLists.txt

@@ -0,0 +1,3 @@
+cmake_minimum_required (VERSION 2.6)
+project (Tutorial)
+add_executable (Tutorial tutorial.cxx)

c/cmake_tutorial/step1/tutorial.cxx

@@ -0,0 +1,17 @@
+// A simple program that computes the square root of a number
+#include <stdio.h>
+#include <stdlib.h>
+#include <math.h>
+int main (int argc, char *argv[])
+{
+  if (argc < 2)
+    {
+    fprintf(stdout,"Usage: %s number\n",argv[0]);
+    return 1;
+    }
+  double inputValue = atof(argv[1]);
+  double outputValue = sqrt(inputValue);
+  fprintf(stdout,"The square root of %g is %g\n",
+          inputValue, outputValue);
+  return 0;
+}