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‎01_Python_Introduction_examples/006 swap two variables.ipynb

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{
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"cells": [
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"<small><small><i>\n",
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"All the IPython Notebooks in this example series by Dr. Milan Parmar are available @ **[GitHub](https://github.com/milaan9/90_Python_Examples)**\n",
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"</i></small></small>"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"# Python Program to Swap Two Variables\n",
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"\n",
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"In this example, you will learn to swap two variables by using a temporary variable and, without using temporary variable.\n",
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"\n",
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"To understand this example, you should have the knowledge of the following **[Python programming](https://github.com/milaan9/01_Python_Introduction/blob/main/000_Intro_to_Python.ipynb)** topics:\n",
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"\n",
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"* **[Python Data Types](https://github.com/milaan9/01_Python_Introduction/blob/main/009_Python_Data_Types.ipynb)**\n",
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"* **[Python Input, Output and Import](https://github.com/milaan9/01_Python_Introduction/blob/main/011_Python_Input_Output_Import.ipynb)**\n",
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"* **[Python Operators](https://github.com/milaan9/01_Python_Introduction/blob/main/012_Python_Operators.ipynb)**"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 1,
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"metadata": {
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"ExecuteTime": {
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"end_time": "2021-07-23T17:52:01.216853Z",
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"start_time": "2021-07-23T17:52:01.179745Z"
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}
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"The value of x after swapping: 9\n",
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"The value of y after swapping: 6\n"
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]
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},
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{
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"data": {
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"text/plain": [
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"'\\n>>Output/Runtime Test Cases:\\n \\nThe value of x after swapping: 9\\nThe value of y after swapping: 6\\n'"
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]
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},
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"execution_count": 1,
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"metadata": {},
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"output_type": "execute_result"
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}
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],
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"source": [
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"#Example: Swap two variables\n",
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"\n",
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"x = 6\n",
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"y = 9\n",
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"\n",
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"# To take inputs from the user\n",
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"#x = input('Enter value of x: ')\n",
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"#y = input('Enter value of y: ')\n",
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"\n",
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"# create a temporary variable and swap the values\n",
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"temp = x\n",
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"x = y\n",
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"y = temp\n",
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"\n",
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"print('The value of x after swapping: {}'.format(x))\n",
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"print('The value of y after swapping: {}'.format(y))\n",
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"\n",
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"'''\n",
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">>Output/Runtime Test Cases:\n",
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" \n",
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"The value of x after swapping: 9\n",
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"The value of y after swapping: 6\n",
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"'''"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"**Explanation:**\n",
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" \n",
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"In this program, we use the **`temp`** variable to hold the value of **`x`** temporarily. We then put the value of **`y`** in **`x`** and later **`temp`** in **`y`**. In this way, the values get exchanged."
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"## Source Code: Without Using Temporary Variable\n",
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"\n",
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"In Python, there is a simple construct to swap variables. The following code does the same as above but without the use of any temporary variable."
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]
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},
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{
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"cell_type": "code",
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"execution_count": 2,
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"metadata": {
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"ExecuteTime": {
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"end_time": "2021-07-23T17:52:01.366265Z",
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"start_time": "2021-07-23T17:52:01.219783Z"
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}
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"x = 9\n",
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"y = 6\n"
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]
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}
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],
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"source": [
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"x = 6\n",
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"y = 9\n",
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"\n",
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"x, y = y, x\n",
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"print(\"x =\", x)\n",
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"print(\"y =\", y)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"If the variables are both numbers, we can use arithmetic operations to do the same. It might not look intuitive at first sight. But if you think about it, it is pretty easy to figure it out. Here are a few examples:"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Addition and Subtraction"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 3,
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"metadata": {
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"ExecuteTime": {
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"end_time": "2021-07-23T17:52:01.514707Z",
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"start_time": "2021-07-23T17:52:01.371149Z"
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}
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"x = 9\n",
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"y = 6\n"
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]
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}
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],
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"source": [
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"x = 6\n",
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"y = 9\n",
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"\n",
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"# Addition and Subtraction\n",
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"x = x + y\n",
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"y = x - y\n",
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"x = x - y\n",
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"print(\"x =\", x)\n",
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"print(\"y =\", y)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### Multiplication and Division"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 4,
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"metadata": {
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"ExecuteTime": {
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"end_time": "2021-07-23T17:52:01.665096Z",
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"start_time": "2021-07-23T17:52:01.519588Z"
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},
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"scrolled": true
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"x = 9.0\n",
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"y = 6.0\n"
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]
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}
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],
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"source": [
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"x = 6\n",
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"y = 9\n",
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"\n",
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"# Multiplication and Division\n",
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"x = x * y\n",
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"y = x / y\n",
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"x = x / y\n",
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"print(\"x =\", x)\n",
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"print(\"y =\", y)"
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]
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},
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{
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"cell_type": "markdown",
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"metadata": {},
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"source": [
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"### XOR swap\n",
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"\n",
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"This algorithm works for integers only"
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]
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},
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{
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"cell_type": "code",
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"execution_count": 5,
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"metadata": {
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"end_time": "2021-07-23T17:52:01.801812Z",
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"start_time": "2021-07-23T17:52:01.668999Z"
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}
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},
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"outputs": [
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{
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"name": "stdout",
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"output_type": "stream",
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"text": [
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"x = 9\n",
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"y = 6\n"
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]
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}
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],
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"source": [
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"x = 6\n",
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"y = 9\n",
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"\n",
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"# XOR swap: This algorithm works for integers only\n",
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"x = x ^ y\n",
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"y = x ^ y\n",
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"x = x ^ y\n",
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"print(\"x =\", x)\n",
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"print(\"y =\", y)"
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]
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},
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