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diff --git a/Fundamental_of_Computing_and_Programming_in_C/Chapter15.ipynb b/Fundamental_of_Computing_and_Programming_in_C/Chapter15.ipynb
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+{
+ "metadata": {
+  "name": "",
+  "signature": "sha256:2bed6e40cd55f716f11e909c76b0c924a863909239fcbbf975814260bb7b4531"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": [
+      "Chapter 15 : Pointers and Functions"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Call By Value"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 1, Page no. 5.112"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Call by value\n",
+      "\n",
+      "def change(x,y):\n",
+      "    x=x+5\n",
+      "    y=y+10\n",
+      "    print \"In the function changes a&b is %d,%d\"%(x,y)\n",
+      "    \n",
+      "a=10\n",
+      "b=20\n",
+      "\n",
+      "print \"\\nBefore calling the function a&b is %d,%d\"%(a,b)\n",
+      "\n",
+      "change(a,b)\n",
+      "print \"\\nAfter calling a&b is %d,%d\"%(a,b)\n",
+      "    "
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "Before calling the function a&b is 10,20\n",
+        "In the function changes a&b is 15,30\n",
+        "\n",
+        "After calling a&b is 10,20\n"
+       ]
+      }
+     ],
+     "prompt_number": 1
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 2, Page no.5.113"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#program to swap(interchange) the two given variable.\n",
+      "\n",
+      "def swap(x,y):\n",
+      "    \n",
+      "    x=x+y\n",
+      "    y=x-y\n",
+      "    x=x-y\n",
+      "    print \"In swap function x=%d, y=%d\"%(x,y)\n",
+      "    return y,x\n",
+      "\n",
+      "a=10\n",
+      "b=20\n",
+      "\n",
+      "print \"Before swap a=%d, b=%d\"%(a,b)\n",
+      "\n",
+      "\n",
+      "print \"\\nAfter the calling the swap function, a=%d,b=%d\"%swap(a,b)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Before swap a=10, b=20\n",
+        "In swap function x=20, y=10\n",
+        "\n",
+        "After the calling the swap function, a=10,b=20\n"
+       ]
+      }
+     ],
+     "prompt_number": 8
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Call By Reference"
+     ]
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 1, Page.No.5.114"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Call By Reference\n",
+      "\n",
+      "def change (x,y):\n",
+      "    x=x+5\n",
+      "    y=y+10\n",
+      "    print \"In the function change a&b is %d %d\"%(x,y)\n",
+      "    return x,y\n",
+      "a=10\n",
+      "b=20\n",
+      "print \"\\nBefore calling the function a&b is %d %d\"%(a,b)\n",
+      "\n",
+      "\n",
+      "print \"After calling the function a&b is %d %d\"%change(a,b)\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "Before calling the function a&b is 10 20\n",
+        "In the function change a&b is 15 30\n",
+        "After calling the function a&b is 15 30\n"
+       ]
+      }
+     ],
+     "prompt_number": 15
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 2, Page No.5.115"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Program to swap(intercahnge) the value of variables.\n",
+      "\n",
+      "a=10\n",
+      "b=20\n",
+      "\n",
+      "print \"\\nBefore swap a=%d, b=%d\"%(swap(a,b))\n",
+      "\n",
+      "def swap(x,y):\n",
+      "    x=x+y\n",
+      "    y=x-y\n",
+      "    x=x-y\n",
+      "    print\"\\nIn swap function x=%d,y=%d\"%(x,y)\n",
+      "    return y,x\n",
+      "\n",
+      "print \"\\nAfter calling swap function a=%d, b=%d\"%(b,a)"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "\n",
+        "In swap function x=20,y=10\n",
+        "\n",
+        "Before swap a=10, b=20\n",
+        "\n",
+        "After calling swap function a=20, b=10\n"
+       ]
+      }
+     ],
+     "prompt_number": 35
+    },
+    {
+     "cell_type": "heading",
+     "level": 2,
+     "metadata": {},
+     "source": [
+      "Example: 3, Page no. 5.115"
+     ]
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": [
+      "#Program to interchange the value of variables using call by reference\n",
+      "def exchange(m,n):\n",
+      "    t=m\n",
+      "    m=n\n",
+      "    n=t\n",
+      "    return n,m\n",
+      "\n",
+      "a,b=input(\"Enter two Numbers: \")\n",
+      "\n",
+      "print \"Before Exchange a=%d,b=%d\"%(a,b)\n",
+      "\n",
+      "\n",
+      "print \"After Exchange a=%d, b=%d\"%(exchange(b,a))\n"
+     ],
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "name": "stdout",
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Enter two Numbers: 10,20\n"
+       ]
+      },
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": [
+        "Before Exchange a=10,b=20\n",
+        "After Exchange a=20, b=10\n"
+       ]
+      }
+     ],
+     "prompt_number": 3
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
\ No newline at end of file