{"id":6221,"date":"2025-05-30T18:08:35","date_gmt":"2025-05-30T12:38:35","guid":{"rendered":"https:\/\/namastedev.com\/blog\/?p=6221"},"modified":"2025-05-30T18:18:36","modified_gmt":"2025-05-30T12:48:36","slug":"count-negative-numbers-in-and-array-code-in-javascript-c-c-java-python","status":"publish","type":"post","link":"https:\/\/namastedev.com\/blog\/count-negative-numbers-in-and-array-code-in-javascript-c-c-java-python\/","title":{"rendered":"Count Negative Numbers in an Array"},"content":{"rendered":"\n<!-- Prism.js CSS and JS -->\n<link href=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/themes\/prism-tomorrow.css\" rel=\"stylesheet\" \/>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/prism.js\"><\/script>\n<script src=\"https:\/\/cdn.jsdelivr.net\/npm\/prismjs@1.29.0\/plugins\/autoloader\/prism-autoloader.min.js\"><\/script>\n\n<style>\n  .wp_blog_code-tabs-container {\n    font-family: \"Segoe UI\", sans-serif !important;\n    max-width: 900px !important;\n    margin: 2rem auto !important;\n    border: 1px solid #ddd !important;\n    border-radius: 8px !important;\n    overflow: hidden !important;\n    background-color: white !important;\n  }\n\n  .wp_blog_code-tabs-header {\n    background: #f7f7f7 !important;\n    display: flex !important;\n    border-bottom: 1px solid #ddd !important;\n  }\n\n  .wp_blog_code-tab-button {\n    flex: 1 !important;\n    padding: 10px 15px !important;\n    border: none !important;\n    background: transparent !important;\n    cursor: pointer !important;\n    font-weight: bold !important;\n    transition: background 0.2s !important;\n    color: #242B33 !important;\n  }\n\n  .wp_blog_code-tab-button.active {\n    background: white !important;\n    border-bottom: 3px solid #0073aa !important;\n  }\n\n  .wp_blog_code-tab-content {\n    display: none !important;\n    padding: 20px !important;\n    background: #242B33 !important;\n  }\n\n  .wp_blog_code-tab-content > pre {\n    background: #242B33 !important;\n  }\n\n  .wp_blog_code-tab-content.active {\n    display: block !important;\n  }\n\n  .wp_blog_code-tab-content pre {\n    margin: 0 !important;\n    overflow-x: auto !important;\n  }\n\n  .wp_blog_explanation {\n    max-width: 900px !important;\n    margin: 2rem auto !important;\n    font-family: \"Segoe UI\", sans-serif !important;\n    line-height: 1.6 !important;\n    background: white !important;\n    color: black !important;\n    padding: 1rem !important;\n    border-radius: 8px !important;\n  }\n\n  .wp_blog_explanation h2 {\n    color: #0073aa !important;\n    font-size: 1.5rem !important;\n    margin-bottom: 0.5rem !important;\n  }\n\n  .wp_blog_explanation code {\n    background: #f1f1f1 !important;\n    padding: 2px 6px !important;\n    border-radius: 4px !important;\n    font-family: monospace !important;\n  }\n<\/style>\n\n<!-- Explanation Block -->\n<div class=\"wp_blog_explanation\">\n  <h2>Question<\/h2>\n  <p>Write a function that returns the number of negative numbers in an array.<\/p>\n\n  <h2>Approach<\/h2>\n  <ul>\n    <li>Initialize a counter to 0.<\/li>\n    <li>Loop through the array.<\/li>\n    <li>If the element is less than 0, increment the counter.<\/li>\n    <li>Return the final count after the loop ends.<\/li>\n  <\/ul>\n\n  <h2>Example<\/h2>\n  <pre><code>\nInput: arr = [2, -6, 4, 8, 1, -9]\nOutput: 2\n  <\/code><\/pre>\n\n  <h2>Time &#038; Space Complexity<\/h2>\n  <ul>\n    <li>Time Complexity: <code>O(n)<\/code> &#8211; where <code>n<\/code> is the number of elements in the array.<\/li>\n    <li>Space Complexity: <code>O(1)<\/code> &#8211; only a counter variable is used.<\/li>\n  <\/ul>\n<\/div>\n\n<!-- Code Tabs -->\n<div class=\"wp_blog_code-tabs-container\">\n  <div class=\"wp_blog_code-tabs-header\">\n    <button class=\"wp_blog_code-tab-button active\" data-lang=\"js\">JavaScript<\/button>\n    <button class=\"wp_blog_code-tab-button\" data-lang=\"c\">C<\/button>\n    <button class=\"wp_blog_code-tab-button\" data-lang=\"cpp\">C++<\/button>\n    <button class=\"wp_blog_code-tab-button\" data-lang=\"java\">Java<\/button>\n    <button class=\"wp_blog_code-tab-button\" data-lang=\"py\">Python<\/button>\n  <\/div>\n\n  <div class=\"wp_blog_code-tab-content active\" data-lang=\"js\">\n    <pre><code class=\"language-javascript\">\nfunction countNegativeNumbers(arr) {\n  let count = 0;\n  for (let i = 0; i < arr.length; i++) {\n    if (arr[i] < 0) {\n      count++;\n    }\n  }\n  return count;\n}\n\nlet arr = [2, -6, 4, 8, 1, -9];\nlet result = countNegativeNumbers(arr);\nconsole.log(\"Result:\", result); \/\/ Output: 2\n    <\/code><\/pre>\n  <\/div>\n\n  <div class=\"wp_blog_code-tab-content\" data-lang=\"c\">\n    <pre><code class=\"language-c\">\n#include &lt;stdio.h&gt;\n\nint countNegativeNumbers(int arr[], int n) {\n  int count = 0;\n  for (int i = 0; i < n; i++) {\n    if (arr[i] < 0) count++;\n  }\n  return count;\n}\n\nint main() {\n  int arr[] = {2, -6, 4, 8, 1, -9};\n  int result = countNegativeNumbers(arr, 6);\n  printf(\"Result: %d\\n\", result); \/\/ Output: 2\n  return 0;\n}\n    <\/code><\/pre>\n  <\/div>\n\n  <div class=\"wp_blog_code-tab-content\" data-lang=\"cpp\">\n    <pre><code class=\"language-cpp\">\n#include &lt;iostream&gt;\nusing namespace std;\n\nint countNegativeNumbers(int arr[], int n) {\n  int count = 0;\n  for (int i = 0; i < n; i++) {\n    if (arr[i] < 0) count++;\n  }\n  return count;\n}\n\nint main() {\n  int arr[] = {2, -6, 4, 8, 1, -9};\n  int result = countNegativeNumbers(arr, 6);\n  cout << \"Result: \" << result << endl; \/\/ Output: 2\n  return 0;\n}\n    <\/code><\/pre>\n  <\/div>\n\n  <div class=\"wp_blog_code-tab-content\" data-lang=\"java\">\n    <pre><code class=\"language-java\">\npublic class Main {\n  public static int countNegativeNumbers(int[] arr) {\n    int count = 0;\n    for (int num : arr) {\n      if (num < 0) count++;\n    }\n    return count;\n  }\n\n  public static void main(String[] args) {\n    int[] arr = {2, -6, 4, 8, 1, -9};\n    int result = countNegativeNumbers(arr);\n    System.out.println(\"Result: \" + result); \/\/ Output: 2\n  }\n}\n    <\/code><\/pre>\n  <\/div>\n\n  <div class=\"wp_blog_code-tab-content\" data-lang=\"py\">\n    <pre><code class=\"language-python\">\ndef count_negative_numbers(arr):\n    count = 0\n    for num in arr:\n        if num < 0:\n            count += 1\n    return count\n\narr = [2, -6, 4, 8, 1, -9]\nresult = count_negative_numbers(arr)\nprint(\"Result:\", result)  # Output: 2\n    <\/code><\/pre>\n  <\/div>\n<\/div>\n\n<!-- Tab Switch Script -->\n<script>\n  document.addEventListener('DOMContentLoaded', function () {\n    const buttons = document.querySelectorAll('.wp_blog_code-tab-button');\n    const contents = document.querySelectorAll('.wp_blog_code-tab-content');\n\n    buttons.forEach(button => {\n      button.addEventListener('click', () => {\n        const lang = button.getAttribute('data-lang');\n\n        buttons.forEach(btn => btn.classList.remove('active'));\n        button.classList.add('active');\n\n        contents.forEach(content => {\n          content.classList.toggle('active', content.getAttribute('data-lang') === lang);\n        });\n      });\n    });\n  });\n<\/script>\n\n\n\n<p><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Question Write a function that returns the number of negative numbers in an array. Approach Initialize a counter to 0. Loop through the array. If the element is less than 0, increment the counter. Return the final count after the loop ends. Example Input: arr = [2, -6, 4, 8, 1, -9] Output: 2 Time<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"om_disable_all_campaigns":false,"_monsterinsights_skip_tracking":false,"_monsterinsights_sitenote_active":false,"_monsterinsights_sitenote_note":"","_monsterinsights_sitenote_category":0,"footnotes":""},"categories":[260,811,810,174,172,173],"tags":[],"class_list":{"0":"post-6221","1":"post","2":"type-post","3":"status-publish","4":"format-standard","6":"category-c-c-plus-plus","7":"category-data-structures-and-algorithms","8":"category-dsa","9":"category-java","10":"category-javascript","11":"category-python"},"aioseo_notices":[],"_links":{"self":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/6221","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/comments?post=6221"}],"version-history":[{"count":5,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/6221\/revisions"}],"predecessor-version":[{"id":6232,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/posts\/6221\/revisions\/6232"}],"wp:attachment":[{"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/media?parent=6221"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/categories?post=6221"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/namastedev.com\/blog\/wp-json\/wp\/v2\/tags?post=6221"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}