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<li class="leaf menu-mlid-2429"><a href="/diversity-and-outreach/researchexperience" class="menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished">REU on AI and Machine Learning</a></li> <li class="leaf menu-mlid-2426"><a href="/diversity-and-inclusion/resources-for-undergraduate-and-graduate-students" class="menu-node-unpublished">Resources for Undergraduate & Graduate Students</a></li> <li class="leaf menu-mlid-2424"><a href="/diversity-and-inclusion/outreach-initiatives" class="menu-node-unpublished">Outreach Initiatives</a></li> <li class="last leaf menu-mlid-2425"><a href="/diversity-and-inclusion/resources-for-faculty-and-staff" class="menu-node-unpublished">Resources for Faculty & Staff</a></li> </ul></li> <li class="last expanded menu-mlid-271"><span class="glyphicon glyphicon-plus menu-expander"></span> <a href="/general">About</a><ul class="menu nav"><li 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container"> <header role="banner" id="page-header"> </header>  <div class="row"> <section class="col-sm-9 col-sm-push-3"> <ol class="breadcrumb"><li><a href="/">Home</a></li> <li><a href="/ugrad" class="menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished active-trail">Undergraduate Program</a></li> <li><a href="/ugrad/becoming-cs-major" class="menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished active-trail active-trail">Becoming a CS Major</a></li> </ol> <div id="content"> <a id="main-content"></a> <h1 class="page-header">Prerequisites</h1> <div class="region region-content"> <section id="block-system-main" class="block block-system clearfix"> <div class="block-content"> <div id="node-24993" class="node node-page clearfix"> <div class="content"> <div class="field field-name-body field-type-text-with-summary field-label-hidden"><div class="field-items"><div class="field-item even"><p>All students concentrating in computer science must take three prerequisite computer science courses: COS 126  (or ECE 115), COS 217, and COS 226. AB candidates must also take any one of MAT 202/204/217 or EGR 154. Students should plan to take both COS 217 and COS 226 before their junior year since at least one of them is a required prerequisite for all computer science departmentals. <em>Note that EGR 154 is not open to AB students.</em></p> <p><span style="background-color: rgb(255, 255, 255);">All prerequisite courses must be taken for a letter grade, not PDF.</span> The three prerequisite computer science courses introduce the core concepts and techniques of the field.  All three are offered every semester.</p> <p>Students with significant background may elect to place out of any number of the intro courses.  Please see <a href="https://placement.cs.princeton.edu/">placement.cs.princeton.edu</a> and contact the COS Placement Officer, <a href="/people/profile/cmoretti">Dr. Morretti</a>.</p> <h2>COS 126 - Computer Science: An Interdisciplinary Approach</h2> <p><a href="/ugrad/COS126-precept-information-for-students-and-advisors">COS 126: Computer Science</a>: An Interdisciplinary Approach, is a broad technical introduction to the field.  It is required for all engineering students as well as prospective computer science concentrators. Normally, one completes this course by the end of their first year. </p> <h2>COS 217 Introduction to Programming Systems &</h2> <h2>COS 226 Algorithms and Data Structures</h2> <p>COS 217 deals with the organization of the computing machine itself and the design of core programs needed to use the machine. COS 226 deals with the design and evaluation of efficient algorithms for tasks that are essential to a preponderance of systems programs and applications.  It also addresses the efficient organization of data essential to these algorithms.  Normally, both COS 217 and COS 226 are completed by the end of sophomore year.</p> <h2> </h2> </div></div></div> </div> </div> </div> </section>  </div> <div class="clearfix"></div> </div> </section> <aside class="col-sm-3 col-sm-pull-9" role="complementary" id="sidebar-first"> <div class="region region-sidebar-first"> <section id="block-menu-block-1" class="block block-menu-block hidden-xs clearfix"> <h2 class="block-title"> Navigation </h2> <div class="block-content"> <div class="menu-block-wrapper menu-block-1 menu-name-main-menu parent-mlid-0 menu-level-2"> <ul class="menu nav"><li class="first leaf menu-mlid-1374"><a href="/ugrad/advisers" class="menu-node-unpublished menu-node-unpublished menu-node-unpublished menu-node-unpublished 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