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diff --git a/Fundamental_of_Computing_and_Programming_in_C/Chapter21.ipynb b/Fundamental_of_Computing_and_Programming_in_C/Chapter21.ipynb
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--- a/Fundamental_of_Computing_and_Programming_in_C/Chapter21.ipynb
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-{
- "metadata": {
-  "name": "",
-  "signature": "sha256:2bdca20a49e1bad43f6968c764966fb35bc4580bd54570e770e266797cc3ab0e"
- },
- "nbformat": 3,
- "nbformat_minor": 0,
- "worksheets": [
-  {
-   "cells": [
-    {
-     "cell_type": "heading",
-     "level": 1,
-     "metadata": {},
-     "source": [
-      "Chapter 21 : The C Preprocessor"
-     ]
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example: 1, Page No.5.149"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#Print square and cube Values by using macro substitutions. \n",
-      "def sq(n):\n",
-      "    return n*n\n",
-      "    \n",
-      "    \n",
-      "def cube(n):\n",
-      "    return n*n*n\n",
-      "    \n",
-      "\n",
-      "a=5\n",
-      "b=3\n",
-      "s=c=0\n",
-      "\n",
-      "#Function calling\n",
-      "s=sq(a)\n",
-      "c=cube(b)\n",
-      "\n",
-      "#Result\n",
-      "print \"Square value of 5 is %d\"%(s)\n",
-      "print \"Cube value of 3 is %d\"%(c)"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "Square value of 5 is 25\n",
-        "Cube value of 3 is 27\n"
-       ]
-      }
-     ],
-     "prompt_number": 11
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example: 2, Page No. 5.151"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#Print the Values using macro substitution.\n",
-      "\n",
-      "VAL=40\n",
-      "\n",
-      "print \"The value is %d\"%VAL\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "The value is 40\n"
-       ]
-      }
-     ],
-     "prompt_number": 12
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example: 3, Page No.:5.151\n"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#Print Value and text using preprocessing.\n",
-      "VAL=35\n",
-      "\n",
-      "HELLO=\"HELLO\"\n",
-      "\n",
-      "res=VAL-5\n",
-      "\n",
-      "print \"Res=VAL-5:Res= %d\"%res\n",
-      "\n",
-      "print \"HELLO\"\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "Res=VAL-5:Res= 30\n",
-        "HELLO\n"
-       ]
-      }
-     ],
-     "prompt_number": 15
-    },
-    {
-     "cell_type": "heading",
-     "level": 2,
-     "metadata": {},
-     "source": [
-      "Example: 4, Page No.:5.152"
-     ]
-    },
-    {
-     "cell_type": "code",
-     "collapsed": false,
-     "input": [
-      "#Program to print the value using preprocessors.\n",
-      "USD=1\n",
-      "UKP=1\n",
-      "\n",
-      "currency_rate=46\n",
-      "currency_rate=100\n",
-      "\n",
-      "rs=10*currency_rate\n",
-      "print  \"The Value of rs is : %d\"%rs\n",
-      "\n"
-     ],
-     "language": "python",
-     "metadata": {},
-     "outputs": [
-      {
-       "output_type": "stream",
-       "stream": "stdout",
-       "text": [
-        "The Value of rs is : 1000\n"
-       ]
-      }
-     ],
-     "prompt_number": 16
-    }
-   ],
-   "metadata": {}
-  }
- ]
-}
-\ No newline at end of file