{"id":199,"date":"2022-05-10T20:45:33","date_gmt":"2022-05-10T19:45:33","guid":{"rendered":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/?page_id=199"},"modified":"2022-05-10T20:58:14","modified_gmt":"2022-05-10T19:58:14","slug":"design","status":"publish","type":"page","link":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/design\/","title":{"rendered":"Design"},"content":{"rendered":"

The design is very important, the programmer needs to work out the details of the program.<\/span>\u00a0The programmer will consider the user interface and structure of the program.<\/span><\/p>\n

Stepwise Refinements<\/h2>\n

This is a method of taking\u00a0<\/span>a large problem and breaking it down into smaller more manageable problems.\u00a0<\/span><\/p>\n

Stepwise\u00a0<\/span>refinement is also called\u00a0<\/span>top down design\u00a0<\/span><\/b>as the process is started as one problem at the top and worked down into smaller problems.\u00a0<\/span><\/p>\n

Two common notations for program design are\u00a0<\/span>pseudocode<\/span><\/b>\u00a0<\/span><\/b>and\u00a0<\/span>structure diagrams<\/span><\/b>.\u00a0<\/span><\/p>\n

Pseudocode<\/span><\/b><\/h2>\n

Problem<\/span><\/b>:\u00a0<\/span><\/b>–\u00a0<\/span><\/b>A\u00a0<\/span>teacher wishes to calculate the average mark of 3 end-of-topic tests and display the results.\u00a0<\/span><\/p>\n

Main Algorithm\u00a0<\/span><\/b><\/p>\n

    \n
  1. Get input values\u00a0<\/span><\/li>\n
  2. Perform Calculation\u00a0<\/span><\/li>\n
  3. Display output\u00a0<\/span><\/li>\n<\/ol>\n

    Refinements for step 1\u00a0<\/span><\/b><\/p>\n

    1.1\u00a0\u00a0 RECEIVE\u00a0<\/span>pupilname<\/span>\u00a0FROM (STRING) KEYBOARD\u00a0<\/span><\/p>\n

    1.2\u00a0\u00a0 RECEIVE pupilmark1 FROM (INTEGER) KEYBOARD\u00a0<\/span><\/p>\n

    1.3\u00a0\u00a0 RECEIVE pupilmark2 FROM (INTEGER) KEYBOARD\u00a0<\/span><\/p>\n

    1.4\u00a0\u00a0 RECEIVE pupilmark3 FROM (INTEGER) KEYBOARD\u00a0<\/span><\/p>\n

    Refinements for step 2\u00a0<\/span><\/b><\/p>\n

    2.1\u00a0\u00a0 SET\u00a0<\/span>totalmarks<\/span>\u00a0TO pupilmark1 + pupilmark2 + pupilmark3\u00a0<\/span><\/p>\n

    2.2\u00a0\u00a0 SET average TO\u00a0<\/span>totalmarks<\/span>\/5\u00a0<\/span><\/p>\n

    Refinements for step 3\u00a0<\/span><\/b><\/p>\n

    3.1\u00a0\u00a0 SEND [\u201cThe total mark is:\u201d &\u00a0<\/span>totalmarks<\/span>] TO DISPLAY\u00a0<\/span><\/p>\n

    3.2\u00a0\u00a0 SEND [\u201cThe average score is:\u201d & average] TO DISPLAY<\/span><\/p>\n

    Note:\u00a0<\/span><\/b>The difference between an algorithm and\u00a0<\/span>pseudocode<\/span>.\u00a0<\/span><\/p>\n

      \n
    • An\u00a0<\/span>algorithm\u00a0<\/span><\/b>is a well-defined\u00a0 sequence of steps that\u00a0<\/span>provides\u00a0<\/span>a solution for a problem<\/span>.<\/span><\/li>\n
    • Pseudocode<\/span><\/b>\u00a0<\/span><\/b>is the language that the\u00a0<\/span>design\u00a0<\/span>is written in.\u00a0<\/span><\/li>\n
    • Please note this is not proper English\u00a0<\/span>but not\u00a0<\/span>a High Level Language either.\u00a0<\/span><\/li>\n<\/ul>\n

      Structured Diagram<\/h2>\n

      \"\"<\/p>\n

      \"\"<\/p>\n

       <\/p>\n

      Flow Chart<\/strong><\/h2>\n

      The owners of a theme park have asked that a program be developed to record the average number of visitors in a week.\u00a0<\/span> \u00a0A\u00a0<\/span>user will enter the total number of visitors for each day of the week.\u00a0<\/span>\u00a0The\u00a0<\/span>program should then output the average number of visitors across the week.<\/span><\/p>\n

      \"\"<\/p>\n

      Interface<\/h2>\n

      A user interface is the part of software that the user sees and interacts with.\u00a0<\/span>\u00a0The\u00a0<\/span>user interface often includes features that allow the user to input data and includes areas where the user will see on-screen output.<\/span>\u00a0When designing user interfaces, it is common practice to create wireframes.<\/span><\/p>\n

      \"\"<\/p>\n

      \"\"<\/p>\n","protected":false},"excerpt":{"rendered":"

      The design is very important, the programmer needs to work out the details of the program.\u00a0The programmer will consider the user interface and structure of the program. Stepwise Refinements This is a method of taking\u00a0a large problem and breaking it down into smaller more manageable problems.\u00a0 Stepwise\u00a0refinement is also called\u00a0top down design\u00a0as the process is […]<\/p>\n","protected":false},"author":79984,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"footnotes":""},"class_list":["post-199","page","type-page","status-publish","hentry"],"_links":{"self":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/pages\/199","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/users\/79984"}],"replies":[{"embeddable":true,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/comments?post=199"}],"version-history":[{"count":5,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/pages\/199\/revisions"}],"predecessor-version":[{"id":209,"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/pages\/199\/revisions\/209"}],"wp:attachment":[{"href":"https:\/\/blogs.glowscotland.org.uk\/glowblogs\/phsn5computingscience\/wp-json\/wp\/v2\/media?parent=199"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}