{"id":43,"date":"2025-04-17T12:43:04","date_gmt":"2025-04-17T12:43:04","guid":{"rendered":"https:\/\/techkubo.com\/cpp\/?p=43"},"modified":"2025-05-27T17:25:08","modified_gmt":"2025-05-27T17:25:08","slug":"cpp-variables","status":"publish","type":"post","link":"https:\/\/techkubo.com\/cpp\/cpp-variables\/","title":{"rendered":"C++ Variables"},"content":{"rendered":"\n<p>Variables act as <strong>containers<\/strong> that store data in a program. They allow you to <strong>save, modify, and manipulate information<\/strong> while writing efficient code.<\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Different Types of Variables<\/h2>\n\n\n\n<p>C++ provides several <strong>data types<\/strong>, each designed for storing specific types of values:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>int<\/code><\/strong> \u2192 Stores whole numbers without decimals (e.g., <code>120<\/code>, <code>-45<\/code>)<\/li>\n\n\n\n<li><strong><code>double<\/code><\/strong> \u2192 Holds floating-point numbers (e.g., <code>25.75<\/code>, <code>-8.99<\/code>)<\/li>\n\n\n\n<li><strong><code>char<\/code><\/strong> \u2192 Stores single characters (e.g., <code>'M'<\/code>, <code>'B'<\/code>) within <strong>single quotes<\/strong><\/li>\n\n\n\n<li><strong><code>string<\/code><\/strong> \u2192 Holds text (e.g., <code>\"Harley Davidson\"<\/code>, <code>\"Ducati\"<\/code>) within <strong>double quotes<\/strong><\/li>\n\n\n\n<li><strong><code>bool<\/code><\/strong> \u2192 Holds <strong>true\/false<\/strong> values, useful for logical decisions<\/li>\n<\/ul>\n\n\n\n<h2 class=\"wp-block-heading\">Declaring and Assigning Variables<\/h2>\n\n\n\n<p>To define a variable, specify its <strong>type<\/strong> and give it a <strong>value<\/strong>:<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Syntax:<\/h4>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;clike&quot;,&quot;mime&quot;:&quot;text\/x-c++src&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;C++&quot;,&quot;language&quot;:&quot;C++&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;cpp&quot;}\">type variableName = value;\n<\/pre><\/div>\n\n\n\n<ul class=\"wp-block-list\">\n<li><code>type<\/code> \u2192 Defines what kind of data the variable holds (<code>int<\/code>, <code>double<\/code>, etc.)<\/li>\n\n\n\n<li><code>variableName<\/code> \u2192 The name assigned to the variable<\/li>\n\n\n\n<li><code>=<\/code> \u2192 Used to <strong>assign<\/strong> a value to the variable<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\">Storing a Number<\/h4>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;clike&quot;,&quot;mime&quot;:&quot;text\/x-c++src&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;C++&quot;,&quot;language&quot;:&quot;C++&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;cpp&quot;}\">#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int engineCC = 1000; \/\/ Engine capacity in cc\n    cout &lt;&lt; &quot;Engine capacity: &quot; &lt;&lt; engineCC &lt;&lt; &quot; cc&quot;;\n\n    return 0;\n}<\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Declaring a Variable Without Assigning a Value<\/h4>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;clike&quot;,&quot;mime&quot;:&quot;text\/x-c++src&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;C++&quot;,&quot;language&quot;:&quot;C++&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;cpp&quot;}\">#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int engineCC;  \/\/ Declaring the variable\n    engineCC = 1000;  \/\/ Assigning the value\n\n    cout &lt;&lt; &quot;Engine capacity: &quot; &lt;&lt; engineCC &lt;&lt; &quot; cc&quot;;\n\n    return 0;\n}<\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Modifying a Variable<\/h2>\n\n\n\n<p>Once assigned, a variable can <strong>change its value<\/strong> during execution.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Example: Updating a Variable<\/h4>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;clike&quot;,&quot;mime&quot;:&quot;text\/x-c++src&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;C++&quot;,&quot;language&quot;:&quot;C++&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;cpp&quot;}\">#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int engineCC = 1000;  \/\/ Initial value\n    engineCC = 650;       \/\/ Updated value\n\n    cout &lt;&lt; &quot;Updated engine capacity: &quot; &lt;&lt; engineCC &lt;&lt; &quot; cc&quot;;\n\n    return 0;\n}<\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Other Variable Types<\/h2>\n\n\n\n<p>C++ offers multiple data types to handle different kinds of values:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;clike&quot;,&quot;mime&quot;:&quot;text\/x-c++src&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;C++&quot;,&quot;language&quot;:&quot;C++&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;cpp&quot;}\">#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int speed = 220;           \/\/ Whole number (integer)\n    double mileage = 15.75;    \/\/ Decimal number (floating point)\n    char grade = 'A';          \/\/ Single character\n    string brand = &quot;Kawasaki&quot;; \/\/ Text (string)\n    bool isAvailable = true;   \/\/ Boolean (true\/false)\n\n    cout &lt;&lt; &quot;Speed: &quot; &lt;&lt; speed &lt;&lt; &quot; km\/h&quot; &lt;&lt; endl;\n    cout &lt;&lt; &quot;Mileage: &quot; &lt;&lt; mileage &lt;&lt; &quot; km\/L&quot; &lt;&lt; endl;\n    cout &lt;&lt; &quot;Grade: &quot; &lt;&lt; grade &lt;&lt; endl;\n    cout &lt;&lt; &quot;Brand: &quot; &lt;&lt; brand &lt;&lt; endl;\n    cout &lt;&lt; &quot;Availability: &quot; &lt;&lt; isAvailable &lt;&lt; endl;\n\n    return 0;\n}<\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Displaying Variables in Output<\/h2>\n\n\n\n<p>To <strong>print a variable along with text<\/strong>, use the <code>cout<\/code> object with the <code>&lt;&lt;<\/code> operator:<\/p>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;clike&quot;,&quot;mime&quot;:&quot;text\/x-c++src&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;C++&quot;,&quot;language&quot;:&quot;C++&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;cpp&quot;}\">#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int topSpeed = 180;  \/\/ Declaring and initializing the variable\n\n    cout &lt;&lt; &quot;The motorcycle's top speed is &quot; &lt;&lt; topSpeed &lt;&lt; &quot; km\/h.&quot;;\n\n    return 0;\n}<\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<h2 class=\"wp-block-heading\">Adding Variables Together<\/h2>\n\n\n\n<p>You can <strong>perform calculations<\/strong> using multiple variables.<\/p>\n\n\n\n<h4 class=\"wp-block-heading\">Example: Addition<\/h4>\n\n\n\n<div class=\"wp-block-codemirror-blocks-code-block code-block\"><pre class=\"CodeMirror\" data-setting=\"{&quot;showPanel&quot;:true,&quot;languageLabel&quot;:&quot;language&quot;,&quot;fullScreenButton&quot;:true,&quot;copyButton&quot;:true,&quot;mode&quot;:&quot;clike&quot;,&quot;mime&quot;:&quot;text\/x-c++src&quot;,&quot;theme&quot;:&quot;material&quot;,&quot;lineNumbers&quot;:false,&quot;styleActiveLine&quot;:false,&quot;lineWrapping&quot;:false,&quot;readOnly&quot;:true,&quot;fileName&quot;:&quot;C++&quot;,&quot;language&quot;:&quot;C++&quot;,&quot;maxHeight&quot;:&quot;400px&quot;,&quot;modeName&quot;:&quot;cpp&quot;}\">#include &lt;iostream&gt;\nusing namespace std;\n\nint main() {\n    int speed1 = 120;\n    int speed2 = 150;\n    int totalSpeed = speed1 + speed2;\n\n    cout &lt;&lt; &quot;Total combined speed: &quot; &lt;&lt; totalSpeed &lt;&lt; &quot; km\/h&quot;;\n\n    return 0;\n}<\/pre><\/div>\n\n\n\n<p><\/p>\n\n\n\n<p><strong>Output:<\/strong> <code>270<\/code><\/p>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Variables act as containers that store data in a program. 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