{
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   "cell_type": "markdown",
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    "# Hello"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "id": "4200d243",
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   "source": [
    "\"\"\"\n",
    "        Example of use of eval() function reading floats and complex.\n",
    "        Thsi evaluated the string typed \n",
    "        \n",
    "        For float try\n",
    "        4*(3 -17) will give -56.0\n",
    "        1.3 + math.cos(math.radians(45)) = 2.007\n",
    "        \n",
    "        For complex try\n",
    "        \n",
    "        3*(4 + 4j) will give (12+15j)\n",
    "        cmath.exp(complex(0,math.pi)) will give -1 (with a bit of rounding error)\n",
    "                                                    \n",
    "        In Python 2 this was the default operation of input() but this was changed\n",
    "        in Python 3, so if you want this now you have to call it explicitely as shown\n",
    "        in the code.\n",
    "\n",
    "\"\"\"\n",
    "\n",
    "import math\n",
    "import cmath\n",
    "\n",
    "def main():\n",
    "    \n",
    "    \n",
    "    s = input(\"Give a float expression : \")       # Read in a string\n",
    "    x = float(eval(s))                            # evaluate and return a float\n",
    "    #                                             Print out the result\n",
    "    print(\"Expression typed : \" + str(s) + \" and value : \" + str(x))\n",
    "    \n",
    "    s = input(\"Give a complex expression : \")       # Read in a string\n",
    "    z = complex(eval(s))                            # evaluate and return a complex\n",
    "    #                                             Print out the result\n",
    "    print(\"Expression typed : \" + str(s) + \" and value : \" + str(z))\n",
    "\n",
    "\n",
    "    \n",
    "#    Execute the program\n",
    "main()"
   ]
  }
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