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+{
+ "metadata": {
+  "name": "Chapter 21"
+ },
+ "nbformat": 3,
+ "nbformat_minor": 0,
+ "worksheets": [
+  {
+   "cells": [
+    {
+     "cell_type": "heading",
+     "level": 1,
+     "metadata": {},
+     "source": "Chapter 21: C's dustier corners"
+    },
+    {
+     "cell_type": "heading",
+     "level": 3,
+     "metadata": {},
+     "source": "Example 21.1, Page number: 401"
+    },
+    {
+     "cell_type": "code",
+     "collapsed": false,
+     "input": "# Example 21.1.py\n# To check whether the character input by the user is for 'add', 'delete' or 'quit'\n\n\n# Variable declaration\nimport sys\nline = 'a'\n\n# Calculation and result\nif (line == 'a') :\n   print ('Add\\n')\nelif (line == 'd') :\n   print ('Delete\\n')\nelif (line == 'q') :\n   print ('Quit\\n')\n   sys.exit(1)   \nelse :\n   print ('Error:Bad command %c\\n' % line)",
+     "language": "python",
+     "metadata": {},
+     "outputs": [
+      {
+       "output_type": "stream",
+       "stream": "stdout",
+       "text": "Add\n\n"
+      }
+     ],
+     "prompt_number": 1
+    }
+   ],
+   "metadata": {}
+  }
+ ]
+}
+\ No newline at end of file