{"id":185842,"date":"2025-01-23T08:18:36","date_gmt":"2025-01-23T08:18:36","guid":{"rendered":"https:\/\/learnexams.com\/blog\/?p=185842"},"modified":"2025-01-23T08:18:38","modified_gmt":"2025-01-23T08:18:38","slug":"write-a-loop-that-reads-positive-integers-from-standard-input-and-that-terminates-when-it-reads-an-integer-that-is-not-positive","status":"publish","type":"post","link":"https:\/\/www.learnexams.com\/blog\/2025\/01\/23\/write-a-loop-that-reads-positive-integers-from-standard-input-and-that-terminates-when-it-reads-an-integer-that-is-not-positive\/","title":{"rendered":"write a loop that reads positive integers from standard input and that terminates when it reads an integer that is not positive"},"content":{"rendered":"\n<p>write a loop that reads positive integers from standard input and that terminates when it reads an integer that is not positive. After the loop terminates, it prints out, ona line by itself, the sum of all even integers read. a while loop and python is required to do the question<br>write a loop that reads positive integers from standard input and that terminates when it reads an integer that is not positive. After the loop terminates, it prints out, ona line by itself, the sum of all even integers read.<\/p>\n\n\n\n<p>a while loop and python is required to do the question<\/p>\n\n\n\n<p><mark style=\"background-color:rgba(0, 0, 0, 0)\" class=\"has-inline-color has-ast-global-color-6-color\"><strong>The Correct Answer and Explanation is :<\/strong><\/mark><\/p>\n\n\n\n<p>To solve the problem of reading positive integers from standard input and calculating the sum of all even integers, we can utilize a <code>while<\/code> loop in Python. The loop will continue to prompt the user for input until a non-positive integer is entered, at which point it will terminate and display the sum of all even integers entered.<\/p>\n\n\n\n<p>Here&#8217;s the Python code to achieve this:<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code># Initialize the sum of even integers\neven_sum = 0\n\n# Start an infinite loop to read user input\nwhile True:\n    # Prompt the user for input and convert it to an integer\n    user_input = int(input(\"Enter a positive integer (or a non-positive integer to stop): \"))\n\n    # Check if the input is positive\n    if user_input &lt;= 0:\n        # If not positive, break the loop\n        break\n    # Check if the input is even\n    elif user_input % 2 == 0:\n        # Add the even number to the sum\n        even_sum += user_input\n\n# After the loop ends, print the sum of even integers\nprint(f\"The sum of all even integers entered is: {even_sum}\")<\/code><\/pre>\n\n\n\n<p><strong>Explanation:<\/strong><\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Initialization:<\/strong> We start by initializing a variable <code>even_sum<\/code> to zero. This variable will accumulate the sum of all even integers entered by the user.<\/li>\n\n\n\n<li><strong>Infinite Loop:<\/strong> We use a <code>while True<\/code> loop to continuously prompt the user for input. This loop will run indefinitely until a non-positive integer is entered.<\/li>\n\n\n\n<li><strong>User Input:<\/strong> Inside the loop, we prompt the user to enter a positive integer. The <code>input()<\/code> function reads the input as a string, and <code>int()<\/code> converts it to an integer.<\/li>\n\n\n\n<li><strong>Input Validation:<\/strong> We check if the entered integer is positive:<\/li>\n<\/ol>\n\n\n\n<ul class=\"wp-block-list\">\n<li>If the integer is less than or equal to zero, we use the <code>break<\/code> statement to exit the loop.<\/li>\n\n\n\n<li>If the integer is positive and even (i.e., <code>user_input % 2 == 0<\/code>), we add it to <code>even_sum<\/code>.<\/li>\n<\/ul>\n\n\n\n<ol class=\"wp-block-list\">\n<li><strong>Termination and Output:<\/strong> Once the loop terminates (i.e., a non-positive integer is entered), we print the accumulated sum of even integers.<\/li>\n<\/ol>\n\n\n\n<p><strong>Example Run:<\/strong><\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>Enter a positive integer (or a non-positive integer to stop): 4\nEnter a positive integer (or a non-positive integer to stop): 7\nEnter a positive integer (or a non-positive integer to stop): 10\nEnter a positive integer (or a non-positive integer to stop): -1\nThe sum of all even integers entered is: 14<\/code><\/pre>\n\n\n\n<p>In this example:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li>The user enters <code>4<\/code>, which is even, so it&#8217;s added to <code>even_sum<\/code> (now 4).<\/li>\n\n\n\n<li>The user enters <code>7<\/code>, which is odd, so it&#8217;s ignored.<\/li>\n\n\n\n<li>The user enters <code>10<\/code>, which is even, so it&#8217;s added to <code>even_sum<\/code> (now 14).<\/li>\n\n\n\n<li>The user enters <code>-1<\/code>, which is non-positive, causing the loop to terminate.<\/li>\n<\/ul>\n\n\n\n<p><strong>Key Points:<\/strong><\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong><code>while True<\/code> Loop:<\/strong> This construct creates an infinite loop that continues until explicitly broken. It&#8217;s useful when the number of iterations isn&#8217;t known in advance and depends on user input.<\/li>\n\n\n\n<li><strong><code>input()<\/code> and <code>int()<\/code>:<\/strong> The <code>input()<\/code> function reads user input as a string. Using <code>int()<\/code> converts this string to an integer, allowing numerical operations.<\/li>\n\n\n\n<li><strong><code>break<\/code> Statement:<\/strong> This statement exits the loop immediately, which is essential for terminating the loop when a non-positive integer is entered.<\/li>\n\n\n\n<li><strong>Modulo Operator (<code>%<\/code>):<\/strong> The expression <code>user_input % 2 == 0<\/code> checks if the number is even. If the remainder when divided by 2 is zero, the number is even.<\/li>\n<\/ul>\n\n\n\n<p>This approach ensures that the program efficiently reads and processes user input, calculating the sum of even integers until a non-positive integer is encountered.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>write a loop that reads positive integers from standard input and that terminates when it reads an integer that is not positive. After the loop terminates, it prints out, ona line by itself, the sum of all even integers read. a while loop and python is required to do the questionwrite a loop that reads [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"default","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","ast-disable-related-posts":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"ast-content-background-meta":{"desktop":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"tablet":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""},"mobile":{"background-color":"var(--ast-global-color-5)","background-image":"","background-repeat":"repeat","background-position":"center center","background-size":"auto","background-attachment":"scroll","background-type":"","background-media":"","overlay-type":"","overlay-color":"","overlay-opacity":"","overlay-gradient":""}},"footnotes":""},"categories":[25],"tags":[],"class_list":["post-185842","post","type-post","status-publish","format-standard","hentry","category-exams-certification"],"_links":{"self":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/185842","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/comments?post=185842"}],"version-history":[{"count":0,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/posts\/185842\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/media?parent=185842"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/categories?post=185842"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.learnexams.com\/blog\/wp-json\/wp\/v2\/tags?post=185842"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}