{
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  {
   "cell_type": "markdown",
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   "source": [
    "# Hello"
   ]
  },
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   "execution_count": null,
   "id": "4200d243",
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   "source": [
    "\"\"\"\n",
    "    Example program to show that you read in a function name from the\n",
    "    command line and then ececute it\n",
    "\n",
    "    Try with fnOne, fnTwo, it it also works for math.cos, math.sin, math.log etc\n",
    "\"\"\"\n",
    "\n",
    "import math\n",
    "\n",
    "\n",
    "def fnOne(y):\n",
    "    \"\"\"\n",
    "        Create a function\n",
    "    \"\"\"\n",
    "    print(\"Funcion one called with y = \" + str(y))\n",
    "    return y     # Just return the given vaue\n",
    "\n",
    "\n",
    "def fnTwo(y):\n",
    "    \"\"\"\n",
    "        Create a second function\n",
    "    \"\"\"\n",
    "    print(\"Funcion two called with y = \" + str(y))\n",
    "    return 2*y   # Just return double the value\n",
    "\n",
    "\n",
    "def main():\n",
    "\n",
    "    while True:     # Keep in a loop\n",
    "        fn = eval(input(\"function : \"))    # Read in functioon name NOTE: eval()\n",
    "        y = float(input(\"y value : \"))     # Get a parameter value\n",
    "\n",
    "        z = fn(y)                          # Call function read in\n",
    "        print(\"Value returned is : \" + str(z))\n",
    "\n",
    "\n",
    "if __name__ == \"__main__\":\n",
    "    main()"
   ]
  }
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