cs200_Spring2020/finalp.html at master · bsdillon/cs200_Spring2020 · GitHub

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<html>
  <head>
  <style>
    table, td {text-align:center; border:1px solid black;}
    .red {color:red;}
  </style>
  <script>
    var rng;

    function RNG(s)
    {
      this.m = 0X80000000;
      this.a = 1103515245;
      this.c = 12345;

      this.seed = s ? s : Math.floor(Math.random() * (this.m-1));
    }

    RNG.prototype.nextInt = function()
    {
      this.seed = (this.a * this.seed + this.c) % (this.m-1);
      return this.seed;
    }

    RNG.prototype.nextFloat = function()
    {
      return this.nextInt() / (this.m - 1);
    }

    function Random()
    {
       return rng.nextFloat();
    }

    var showAnswers = false;
    function newExam()
    {
      var num = Math.floor(Math.random()*10000+5000);
      examID.value=num;
      loadExam(false);
    }

    function loadExam(shouldAnswer)
    {
      showAnswers=shouldAnswer;
      var x = examID.value;
      x=parseInt(x);
      if(isNaN(x))
      {
        alert("Value "+examID.value+" is NOT an integer");
        newExam();
        return;
      }
      x=x%15000;
      rng = new RNG(x);
      examID.value=x;
      createExam();
    }

    function decToBinary(dec)
    {
      var bin = "";
      var tmp = dec;
      var p = 1;
      while(tmp>0)
      {
        if(tmp%2==1)
        {
          bin="1"+bin;
        }
        else
        {
          bin="0"+bin;
        }

        p*=2;
        tmp=Math.floor(tmp/2);
      }

      while(bin.length<8)
      {
        bin="0"+bin;
      }

      bin = bin.slice(0,4)+" "+bin.slice(4,8);
      return bin;
    }

    function createExam()
    {
      lines = [];
      var index=0;
      var r = Math.floor(Random()*4);
      var map= ["binary","octal","decimal","hexadecimal"];
      var s="Describe the advantages of encoding a number as "+map[r]+". When is it typically used?<br>";
      if(showAnswers)
      {
        s+="<p class='red'>";
      }
      else
      {
        s+="<p>";
      }
      if(r==0&&showAnswers){s+="Binary has only two values: on and off. Computers can understand electricity on/off. All computer memory really is binary.";}
      if(r==1&&showAnswers){s+="Octal is no longer used as often. It is mostly found in security programs and aircraft transponder codes.";}
      if(r==2&&showAnswers){s+="Decimal has ten values like our hands. Humans are taught to work with decimal early on and are most comfortable with decimal.";}
      if(r==3&&showAnswers){s+="Hexadecimal needs new digits A to F, but it compresses large numbers into few digits and aligns perfectly with bytes.";}

      lines[index++]=s+"</p>";

      var dec = Math.floor(Random()*128+120);
      var bin = decToBinary(dec);
      var hMap =['0','1','2','3','4','5','6','7','8','9','A','B','C','D','E','F'];
      var hex=hMap[Math.floor(dec/16)]+hMap[dec%16];
      var oct=''+(Math.floor(dec/64))+(Math.floor(dec/8)%8)+(dec%8);

      r = Math.floor(Random()*4);
      s="<table><tr><th colspan='4'>Convert the number into the other bases</th></tr><tr><th>Base-10</th><th>Base-2</th><th>Base 8</th><th>Base 16</th></tr>";
      if(showAnswers)
      {
        s+="<tr class='red'>";
      }
      else
      {
        s+="<tr>";
      }
      s+="<td>";
      if(r==0||showAnswers){s+=dec;}
      s+="</td><td>";
      if(r==1||showAnswers){s+=bin;}
      s+="</td><td>";
      if(r==2||showAnswers){s+=oct;}
      s+="</td><td>";
      if(r==3||showAnswers){s+=hex;}
      s+="</td></tr></table>";
      lines[index++]=s+"<br>";

      s="Create a truth table for ";
      r=Math.floor(Random()*3);
      if(r==0)
      {
        s+="!A &and; (C &or; B).<br>";
      }
      else if(r==1)
      {
        s+="(A &or; !A) &or; B.<br>";
      }
      else if(r==2)
      {
        s+="(!A &and; B) &or; !C.<br>";
      }

      if(showAnswers)
      {
        s+="<p class='red'>";
      }
      else
      {
        s+="<p>";
      }

      if(r==0&&showAnswers)
      {
        s+="Remember that the values for A, B, and C represent all the number 0 to 7<br>";
        s+="<table class='red'>"
        s+="<tr><th>#val</th><th>A</th><th>B</th><th>C</th><th>C&or;B</th><th>A&and;(C&or;B)</th></tr>";
        s+="<tr><td>0</td><td>0</td><td>0</td><td>0</td><td>0</td><td>0</td></tr>";
        s+="<tr><td>1</td><td>0</td><td>0</td><td>1</td><td>1</td><td>0</td></tr>";
        s+="<tr><td>2</td><td>0</td><td>1</td><td>0</td><td>1</td><td>0</td></tr>";
        s+="<tr><td>3</td><td>0</td><td>1</td><td>1</td><td>1</td><td>0</td></tr>";
        s+="<tr><td>4</td><td>1</td><td>0</td><td>0</td><td>0</td><td>0</td></tr>";
        s+="<tr><td>5</td><td>1</td><td>0</td><td>1</td><td>1</td><td>1</td></tr>";
        s+="<tr><td>6</td><td>1</td><td>1</td><td>0</td><td>1</td><td>1</td></tr>";
        s+="<tr><td>7</td><td>1</td><td>1</td><td>1</td><td>1</td><td>1</td></tr>";
        s+="</table>"
      }
      else if(r==1&&showAnswers)
      {
        s+="Remember that the values for A and B represent all the number 0 to 3<br>";
        s+="<table class='red'>"
        s+="<tr><th>#val</th><th>A</th><th>B</th><th>!A</th><th>A&or;!A</th><th>(A&or;!A)&or;B</th></tr>";
        s+="<tr><td>0</td><td>0</td><td>0</td><td>1</td><td>1</td><td>1</td></tr>";
        s+="<tr><td>1</td><td>0</td><td>1</td><td>1</td><td>1</td><td>1</td></tr>";
        s+="<tr><td>2</td><td>1</td><td>0</td><td>0</td><td>1</td><td>1</td></tr>";
        s+="<tr><td>3</td><td>1</td><td>1</td><td>0</td><td>1</td><td>1</td></tr>";
        s+="</table>"
      }
      else if(r==2&&showAnswers)
      {
        s+="Remember that the values for A, B, and C represent all the number 0 to 7<br>";
        s+="<table class='red'>"
        s+="<tr><th>#val</th><th>A</th><th>B</th><th>C</th><th>!A</th><th>!C</th><th>!A&and;B</th><th>(!A&and;B)&or;!C</th></tr>";
        s+="<tr><td>0</td><td>0</td><td>0</td><td>0</td><td>1</td><td>1</td><td>0</td><td>1</td></tr>";
        s+="<tr><td>1</td><td>0</td><td>0</td><td>1</td><td>1</td><td>0</td><td>0</td><td>0</td></tr>";
        s+="<tr><td>2</td><td>0</td><td>1</td><td>0</td><td>1</td><td>1</td><td>1</td><td>1</td></tr>";
        s+="<tr><td>3</td><td>0</td><td>1</td><td>1</td><td>1</td><td>0</td><td>1</td><td>1</td></tr>";
        s+="<tr><td>4</td><td>1</td><td>0</td><td>0</td><td>0</td><td>1</td><td>0</td><td>1</td></tr>";
        s+="<tr><td>5</td><td>1</td><td>0</td><td>1</td><td>0</td><td>0</td><td>0</td><td>0</td></tr>";
        s+="<tr><td>6</td><td>1</td><td>1</td><td>0</td><td>0</td><td>1</td><td>0</td><td>1</td></tr>";
        s+="<tr><td>7</td><td>1</td><td>1</td><td>1</td><td>0</td><td>0</td><td>0</td><td>0</td></tr>";
        s+="</table>"
      }

      lines[index++]=s+"</p>";


      s="Define these two terms as they apply to computer architecture: ";
      tmp = ["Input","Output","Processor","Memory"];
      tmp2 = ["Input devices allow the user to tell the computer information","Output devices allow the computer to tell the user information","The processor does all the thinking in the computer: math and logic","Memory holds all data and the program itself"]
      var answer = "";
      for(let i=0;i<2;i++)
      {
        let x = Math.floor(Random()*tmp.length);
        s+=tmp[x]+" ";
        answer+=tmp2[x]+"<br>";
        if(i==0){s+="and ";}
        tmp.splice(x,1);
      }

      if(showAnswers)
      {
        s+="<p class='red'>"+answer;
      }
      else
      {
        s+="<p>";
      }

      s+="</p>"

      lines[index++]=s+".<br>";

      s="What is the purpose of a 'NIC' card?<br>";
      answer = "The NIC (network interface card) allows the computer to connect to another over the internet."
      if(Random()<.5)
      {
        s="What is the purpose of a 'Graphics' card?<br>";
        answer="The graphics card allows the computer to put information on the screen, especially doing math that is specific to graphics.";
      }

      if(showAnswers)
      {
        s+="<p class='red'>"+answer;
      }
      else
      {
        s+="<p>";
      }

      s+="</p>"
      lines[index++]=s;


      var final="<ol>";
      while(lines.length>0)
      {
        index=lines.length-1;
        //index=Math.floor(Random()*lines.length);
        tmp=lines[index];
        lines.splice(index,1);
        final+="<li>"+tmp+"</li>";
      }
      final+="</ol>";
      output.innerHTML=final;
    }
  </script>
  </head>
  <body>
    <button onclick="newExam()">Randomize</button><br>
    <p><b>Exam ID: </b><input type="text" id="examID"></input>
    <button onClick="loadExam(false)">Load</button>
    <button onClick="loadExam(true)">Answer</button></p>
    <p id="output"></p>
  </body>
</html>