03 - Conditional exection/Conditional executions.ipynb

{
 "cells": [
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h1> Condtional executions </h1>\n",
    "\n",
    "In order to write useful programs, we almost always need the ability to check conditions and change the behavior of the program accordingly.\n",
    "\n",
    "The simplest form is if statement:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 1,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "x is positive.\n"
     ]
    }
   ],
   "source": [
    "x = 5\n",
    "\n",
    "if x > 0:\n",
    "    print(\"x is positive.\")"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 2,
   "metadata": {},
   "outputs": [],
   "source": [
    "if x < 0:\n",
    "    pass #you can use pass for doing nothing."
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h1> Alternative Conditions</h1>\n",
    "\n",
    "When we have two possibilites and the condition determines which one to execute. For example:\n",
    "    "
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 3,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "Odd Number\n"
     ]
    }
   ],
   "source": [
    "if x%2 == 0:\n",
    "    print (\"Even Number\")\n",
    "else:\n",
    "    print(\"Odd Number\")"
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h1> Chained Conditions </h1>\n",
    "\n",
    "When we have more than two possibilities. For example:"
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 4,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "X and Y are equal\n"
     ]
    }
   ],
   "source": [
    "y = 5\n",
    "\n",
    "if x > y:\n",
    "    print (\"X is greater than y\")\n",
    "elif x < y:\n",
    "    print(\"X is less than Y\")\n",
    "else:\n",
    "    print(\"X and Y are equal\")\n",
    "    "
   ]
  },
  {
   "cell_type": "markdown",
   "metadata": {},
   "source": [
    "<h1>  Nested Conditions </h1>\n",
    "One conditional can also be nested within another."
   ]
  },
  {
   "cell_type": "code",
   "execution_count": 5,
   "metadata": {},
   "outputs": [
    {
     "name": "stdout",
     "output_type": "stream",
     "text": [
      "x and y are equal\n"
     ]
    }
   ],
   "source": [
    "if x == y:\n",
    "    print('x and y are equal')\n",
    "else:\n",
    "    if x < y:\n",
    "        print('x is less than y')\n",
    "    else:\n",
    "        print('x is greater than y')"
   ]
  }
 ],
 "metadata": {
  "kernelspec": {
   "display_name": "Python 3",
   "language": "python",
   "name": "python3"
  },
  "language_info": {
   "codemirror_mode": {
    "name": "ipython",
    "version": 3
   },
   "file_extension": ".py",
   "mimetype": "text/x-python",
   "name": "python",
   "nbconvert_exporter": "python",
   "pygments_lexer": "ipython3",
   "version": "3.7.7"
  }
 },
 "nbformat": 4,
 "nbformat_minor": 4
}