Assignment-1.ipynb

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    "### Operators are something by which we ca perform operations like adding,multiplying,dividing\n",
    "### Values are something that we can store in memory or variable and use it later \n",
    "\n",
    "- Operators are :-  +, *, -, /\n",
    "- Values :-  'hello', -87.8\n",
    "\n"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "## String :- String is something that is wrapped in single or doublequotes, It is a value\n",
    "## Variable :- Variables are used to store data or value in it\n",
    "- for ex:- spam = \"Spam\"\n",
    "- here spam is a variable that holds string value named \"Spam\"."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "spam = 'Spam'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'Spam'"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "spam"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
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     "data": {
      "text/plain": [
       "str"
      ]
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     "execution_count": 4,
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   "source": [
    "type(spam)"
   ]
  },
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   "source": [
    "## Three Types of DataForms are Int,Float,String"
   ]
  },
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   "source": [
    "## An expression is a combination of values, variables, operators, and calls to functions. Expressions need to be evaluated."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 9,
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     "name": "stdout",
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     "text": [
      "The sum of the two numbers are 5\n"
     ]
    }
   ],
   "source": [
    "##Expression example\n",
    "b = 2\n",
    "a = 3\n",
    "## here a+b is an expression\n",
    "sum =  a+b\n",
    "print('The sum of the two numbers is {}'.format(sum))\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 11,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "20\n"
     ]
    }
   ],
   "source": [
    "## declaration means we are assigning values to a variable.Here spam=10 is declaration of variable\n",
    "spam=10\n",
    "## expression means when we are performing operations on it.Here spam *2 is expression\n",
    "spam*2\n",
    "print(spam*2)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 12,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "23"
      ]
     },
     "execution_count": 12,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "## Here bacon will contain value as 23 because we are adding by +1 to variable bacon which is storing integer value.\n",
    "bacon = 22\n",
    "bacon + 1\n"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 14,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "'spamspamspam'"
      ]
     },
     "execution_count": 14,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "## for both the expressions value would be same because its concatinating 2 strings which holds 3 times spam\n",
    "## same for spam*3 it multiplies by 3\n",
    "'spam' + 'spamspam'\n",
    "'spam' * 3"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 21,
   "metadata": {},
   "outputs": [
    {
     "ename": "SyntaxError",
     "evalue": "invalid syntax (<ipython-input-21-bbbb2abd74f6>, line 4)",
     "output_type": "error",
     "traceback": [
      "\u001b[1;36m  File \u001b[1;32m\"<ipython-input-21-bbbb2abd74f6>\"\u001b[1;36m, line \u001b[1;32m4\u001b[0m\n\u001b[1;33m    2eggs=100\u001b[0m\n\u001b[1;37m     ^\u001b[0m\n\u001b[1;31mSyntaxError\u001b[0m\u001b[1;31m:\u001b[0m invalid syntax\n"
     ]
    }
   ],
   "source": [
    "##Why is it that eggs is a true variable name but 100 is not?\n",
    "## Ans :- A variable name cannot start with a number.Its defined in the rules of python variable declaration.\n",
    "\n",
    "2eggs=100\n",
    "2eggs"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 27,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "3\n",
      "3.0\n",
      "3\n",
      "<class 'str'>\n"
     ]
    }
   ],
   "source": [
    "## we can use int,float,str functions to convert values\n",
    "a=3\n",
    "print(a)\n",
    "k=float(a)\n",
    "print(k)\n",
    "z=str(a)\n",
    "print(z)\n",
    "print(type(z))"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 30,
   "metadata": {},
   "outputs": [
    {
     "ename": "TypeError",
     "evalue": "can only concatenate str (not \"int\") to str",
     "output_type": "error",
     "traceback": [
      "\u001b[1;31m---------------------------------------------------------------------------\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m                                 Traceback (most recent call last)",
      "\u001b[1;32m<ipython-input-30-140d7e9d596f>\u001b[0m in \u001b[0;36m<module>\u001b[1;34m\u001b[0m\n\u001b[1;32m----> 1\u001b[1;33m \u001b[0mf\u001b[0m \u001b[1;33m=\u001b[0m \u001b[1;34m'I have eaten '\u001b[0m \u001b[1;33m+\u001b[0m \u001b[1;36m99\u001b[0m \u001b[1;33m+\u001b[0m \u001b[1;34m' burritos.'\u001b[0m\u001b[1;33m\u001b[0m\u001b[1;33m\u001b[0m\u001b[0m\n\u001b[0m",
      "\u001b[1;31mTypeError\u001b[0m: can only concatenate str (not \"int\") to str"
     ]
    }
   ],
   "source": [
    "f = 'I have eaten ' + 99 + ' burritos.'"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 32,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "I have eaten 99 burritos.\n"
     ]
    }
   ],
   "source": [
    "## In the above case i will convert 99 into string and then perform the following expression.I will do type casting\n",
    "f = 'I have eaten ' + str(99) + ' burritos.'\n",
    "print(f)"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": null,
   "metadata": {},
   "outputs": [],
   "source": []
  }
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