{"id":4801,"date":"2022-08-19T10:51:23","date_gmt":"2022-08-19T10:51:23","guid":{"rendered":"https:\/\/www.wikitechy.com\/interview-questions\/?p=4801"},"modified":"2022-08-19T10:51:23","modified_gmt":"2022-08-19T10:51:23","slug":"what-is-stack-in-c","status":"publish","type":"post","link":"https:\/\/www.wikitechy.com\/interview-questions\/cpp\/what-is-stack-in-c\/","title":{"rendered":"What is Stack in C++ ?"},"content":{"rendered":"<ul>\n<li style=\"text-align: justify;\">Stack is an abstract data structure that contains a collection of elements.<\/li>\n<li style=\"text-align: justify;\">It implements the Last In First Out (LIFO) mechanism this element is pushed at the end is popped out first.<\/li>\n<li style=\"text-align: justify;\">It uses an encapsulated object of either deque or vector or list as its underlying container, providing a specific set of member functions to access its elements.<\/li>\n<li style=\"text-align: justify;\">Stack class is a container adapter and container objects hold data of a similar data type.<\/li>\n<li style=\"text-align: justify;\">From various sequence containers we can create a stack.<\/li>\n<li style=\"text-align: justify;\">By default, deque container will be used, if there is no container is provided.<\/li>\n<li style=\"text-align: justify;\">It cannot be used to manipulate, because container adapters don\u2019t support iterators.<\/li>\n<li style=\"text-align: justify;\">In stack Type is the Type of element contained and it can be any valid C++ type or even a user-defined type.<\/li>\n<li style=\"text-align: justify;\">In stack containeris the Type of underlying container object.<\/li>\n<li style=\"text-align: justify;\">Here three types of member types, they are:\n<ul>\n<li>Value_type- The first template parameter and donates the element types.<\/li>\n<li>Container_type- The second template parameter and denotes the underlying container type.<\/li>\n<li>Size_type- It is an unsigned integral type.<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<h2 id=\"syntax\"><strong>Syntax<\/strong><\/h2>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-cpp code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-cpp code-embed-code\">template <class Type, class Container = deque<Type> > class stack;<\/code><\/pre> <\/div>\n<p><img fetchpriority=\"high\" decoding=\"async\" class=\"alignnone size-full wp-image-4802 aligncenter\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-structure-cpp.png\" alt=\"\" width=\"1068\" height=\"713\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-structure-cpp.png 1068w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-structure-cpp-300x200.png 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-structure-cpp-1024x684.png 1024w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-structure-cpp-768x513.png 768w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-structure-cpp-390x260.png 390w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-structure-cpp-820x547.png 820w\" sizes=\"(max-width: 1068px) 100vw, 1068px\" \/><\/p>\n<h2 id=\"sample-code\">Sample Code<\/h2>\n<div class=\"code-embed-wrapper\"> <div class=\"code-embed-infos\"> <\/div> <pre class=\"language-cpp code-embed-pre line-numbers\"  data-start=\"1\" data-line-offset=\"0\"><code class=\"language-cpp code-embed-code\">#include <iostream>  <br\/>#include <stack>  <br\/>using namespace std;  <br\/>void newstack(stack <int> ss)  <br\/>{  <br\/>    stack <int> sg = ss;  <br\/>    while (!sg.empty())  <br\/>    {  <br\/>        cout << &#039;\\t&#039; << sg.top();  <br\/>        sg.pop();  <br\/>    }  <br\/>    cout << &#039;\\n&#039;;  <br\/>}  <br\/>int main ()  <br\/>{  <br\/>    stack <int> newst;  <br\/>    newst.push(55);  <br\/>    newst.push(44);  <br\/>    newst.push(33);  <br\/>    newst.push(22);  <br\/>    newst.push(11);  <br\/>  <br\/>    cout << &quot;The stack newst is : &quot;;  <br\/>    newstack(newst);  <br\/>    cout << &quot;\\n newst.size() : &quot; << newst.size();  <br\/>    cout << &quot;\\n newst.top() : &quot; << newst.top();  <br\/>    cout << &quot;\\n newst.pop() : &quot;;  <br\/>    newst.pop();  <br\/>    newstack(newst);   <br\/>    return 0;  <br\/>}  <\/code><\/pre> <\/div>\n<h2 id=\"output\">Output<\/h2>\n<p><img decoding=\"async\" class=\"alignnone size-full wp-image-4803\" src=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack.png\" alt=\"\" width=\"1423\" height=\"361\" srcset=\"https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack.png 1423w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-300x76.png 300w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-1024x260.png 1024w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-768x195.png 768w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-390x99.png 390w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-820x208.png 820w, https:\/\/www.wikitechy.com\/interview-questions\/wp-content\/uploads\/2022\/08\/stack-1180x299.png 1180w\" sizes=\"(max-width: 1423px) 100vw, 1423px\" \/><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Stack is an abstract data structure that contains a collection of elements. It implements the Last In First Out (LIFO) mechanism this element is pushed at the end is popped out first. It uses an encapsulated object of either deque or vector or list as its underlying container, providing a specific set of member functions [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[2080],"tags":[18431,18433,18429,18432,3344,18430,18437,3321,18434,18435,18436],"class_list":["post-4801","post","type-post","status-publish","format-standard","hentry","category-cpp","tag-clear-stack-c","tag-pop-program-in-c","tag-stack-c-example","tag-stack-in-c-using-array","tag-stack-push","tag-stack-push-pop-program-in-c","tag-what-is-stack-and-queue-in-c","tag-what-is-stack-in-c","tag-what-is-stack-in-c-programming","tag-what-is-stack-in-c-with-example","tag-what-is-stack-memory-in-c"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.6 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>What is Stack in C++ - C++ Stack - Stack in C++ - Wikitechy<\/title>\n<meta name=\"description\" content=\"What is Stack in C++ ? 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