{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "# Rounding with Function Calls"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "These exercises give you practice calling functions in Python."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Question 1.** Using the function `round`, round the number 1.23456789 to the nearest integer.  Give the result the name `rounded`."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1.0"
      ]
     },
     "execution_count": 1,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Round can take two parameters, the first is the number to round, while the second is the decimal places in which to round to.\n",
    "rounded = round(1.23456789, 0)\n",
    "rounded"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Question 2.** Round 1.23456789 to the nearest *thousandth* (.001).\n",
    "\n",
    "*Hint:* Running `round?` in a code cell will show you Python's documentation for the `round` function."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "1.235"
      ]
     },
     "execution_count": 2,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "# Using round, with the second parameter as three, you get three decimal point precision.\n",
    "less_rounded = round(1.23456789, 3)\n",
    "less_rounded"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "Suppose you're counting all the small donations made to a political candidate.  The donations were:\n",
    "\n",
    "* 32.25\n",
    "* 15.00\n",
    "* 24.45\n",
    "\n",
    "You need to report the total rounded to the nearest dollar.\n",
    "\n",
    "**Question 3.** First you decide to round *each donation* individually and then add up those 3 rounded amounts.  Compute that."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "71.0"
      ]
     },
     "execution_count": 3,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "sum_of_rounded_amounts = round(32.25, 0) + round(15.00, 0) + round(24.45, 0)\n",
    "sum_of_rounded_amounts"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "**Question 4.** You suspect this method doesn't work quite right.  To check, you decide to try a different method: Adding up the donations, and then rounding the total.  Compute that."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "data": {
      "text/plain": [
       "72.0"
      ]
     },
     "execution_count": 4,
     "metadata": {},
     "output_type": "execute_result"
    }
   ],
   "source": [
    "rounded_sum = round((32.25 + 15.00 + 24.45), 0)\n",
    "rounded_sum"
   ]
  }
 ],
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