diff --git a/Numpy using Cython Source code/BoundCheck_Indices_Source code/array5.pyx b/Numpy using Cython Source code/BoundCheck_Indices_Source code/array5.pyx
new file mode 100644
index 0000000..ff0ce4a
--- /dev/null
+++ b/Numpy using Cython Source code/BoundCheck_Indices_Source code/array5.pyx	
@@ -0,0 +1,4 @@
+import array5_boundCheck
+import numpy
+arr = numpy.arange(1000000000, dtype=numpy.int)
+array5_boundCheck.do_calc(arr)
\ No newline at end of file
diff --git a/Numpy using Cython Source code/BoundCheck_Indices_Source code/array5_boundCheck.pyx b/Numpy using Cython Source code/BoundCheck_Indices_Source code/array5_boundCheck.pyx
new file mode 100644
index 0000000..89d819b
--- /dev/null
+++ b/Numpy using Cython Source code/BoundCheck_Indices_Source code/array5_boundCheck.pyx	
@@ -0,0 +1,26 @@
+import time
+import numpy
+cimport numpy
+cimport cython
+
+ctypedef numpy.int_t DTYPE_t
+
+@cython.boundscheck(False) # turn of bound cehking for entire function
+@cython.wraparound(False) # turn off negative index wrapping for entire function
+
+def do_calc(numpy.ndarray[DTYPE_t, ndim=1] arr):
+  cdef int maxval
+  cdef unsigned long long int total
+  cdef int k
+  cdef double t1, t2, t
+  cdef int arr_shape = arr.shape[0]
+
+  t1 = time.time()
+
+  for k in range(arr_shape):
+      total = total + arr[k]
+  print "Total = ", total
+
+  t2 = time.time()
+  t =  t2 - t1
+  print("%.10f" % t)
\ No newline at end of file
diff --git a/Numpy using Cython Source code/BoundCheck_Indices_Source code/setup.py b/Numpy using Cython Source code/BoundCheck_Indices_Source code/setup.py
new file mode 100644
index 0000000..181862f
--- /dev/null
+++ b/Numpy using Cython Source code/BoundCheck_Indices_Source code/setup.py	
@@ -0,0 +1,8 @@
+from distutils.core import setup, Extension
+from Cython.Build import cythonize
+import numpy
+
+setup(
+      ext_modules = cythonize("array5.pyx"),
+      include_dirs=[numpy.get_include()]
+      )
diff --git a/Numpy using Cython Source code/Indexing Source code/array4.pyx b/Numpy using Cython Source code/Indexing Source code/array4.pyx
new file mode 100644
index 0000000..ae5a10e
--- /dev/null
+++ b/Numpy using Cython Source code/Indexing Source code/array4.pyx	
@@ -0,0 +1,4 @@
+import array4_indexing
+import numpy
+arr = numpy.arange(1000000000, dtype=numpy.int)
+array4_indexing.do_calc(arr)
\ No newline at end of file
diff --git a/Numpy using Cython Source code/Indexing Source code/array4_indexing.pyx b/Numpy using Cython Source code/Indexing Source code/array4_indexing.pyx
new file mode 100644
index 0000000..b314d90
--- /dev/null
+++ b/Numpy using Cython Source code/Indexing Source code/array4_indexing.pyx	
@@ -0,0 +1,20 @@
+import time
+import numpy
+cimport numpy
+
+ctypedef numpy.int_t DTYPE_t
+
+def do_calc(numpy.ndarray[DTYPE_t, ndim=1] arr):
+    cdef int maxval
+    cdef unsigned long long int total
+    cdef int k
+    cdef double t1, t2, t
+    cdef int arr_shape = arr.shape[0]
+
+    t1=time.time()
+    for k in range(arr_shape):
+        total = total + arr[k]
+    print "Total =", total
+    t2=time.time()
+    t = t2-t1
+    print("%.20f" % t)
\ No newline at end of file
diff --git a/Numpy using Cython Source code/Indexing Source code/setup.py b/Numpy using Cython Source code/Indexing Source code/setup.py
new file mode 100644
index 0000000..f8aa2f0
--- /dev/null
+++ b/Numpy using Cython Source code/Indexing Source code/setup.py	
@@ -0,0 +1,8 @@
+from distutils.core import setup, Extension
+from Cython.Build import cythonize
+import numpy
+
+setup(
+      ext_modules = cythonize("array4.pyx"),
+      include_dirs=[numpy.get_include()]
+      )
diff --git a/Numpy using Cython Source code/NumPy with cython Source code/numAddCDType.pyx b/Numpy using Cython Source code/NumPy with cython Source code/numAddCDType.pyx
new file mode 100644
index 0000000..bbf29de
--- /dev/null
+++ b/Numpy using Cython Source code/NumPy with cython Source code/numAddCDType.pyx	
@@ -0,0 +1,22 @@
+import time
+import numpy
+cimport numpy
+
+cdef unsigned long long int maxval
+cdef unsigned long long int total
+cdef int k
+cdef double t1, t2, t
+cdef numpy.ndarray arr
+
+maxval = 1000000000
+arr = numpy.arange(maxval)
+
+t1 = time.time()
+
+for k in arr:
+    total = total + k
+print "Total =", total
+
+t2 = time.time()
+t = t2 - t1
+print("%.20f" % t)
diff --git a/Numpy using Cython Source code/NumPy with cython Source code/setup.py b/Numpy using Cython Source code/NumPy with cython Source code/setup.py
new file mode 100644
index 0000000..c6cb141
--- /dev/null
+++ b/Numpy using Cython Source code/NumPy with cython Source code/setup.py	
@@ -0,0 +1,8 @@
+from distutils.core import setup, Extension
+from Cython.Build import cythonize
+import numpy
+
+setup(
+      ext_modules = cythonize("numAddCDType.pyx"),
+      include_dirs=[numpy.get_include()]
+      )
diff --git a/Numpy using Cython Source code/PythonNumpy Source code/numAddition.py b/Numpy using Cython Source code/PythonNumpy Source code/numAddition.py
new file mode 100644
index 0000000..8fc9dd5
--- /dev/null
+++ b/Numpy using Cython Source code/PythonNumpy Source code/numAddition.py	
@@ -0,0 +1,16 @@
+import time
+import numpy
+
+total = 0
+num1 = 1000000000
+arr = numpy.arange(num1, dtype=numpy.int64)
+
+t1 = time.time()
+
+for k in arr:
+    total = total + k
+print("Total = ", total)
+
+t2 = time.time()
+t = t2 - t1
+print("%.20f" % t)