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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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+{
+ "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": {}
+  }
+ ]
+}
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