javascript - How do i make a simple graph for each correct answer -

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i have big test coming tomorrow, , i'm not quite sure how draw graph each time correct answer, nor can find/search solution. simply, want cavas add x height on column/pillar each time answer correct, in javascript.

if show me how it, while using code on site: http://www.javascriptsource.com/miscellaneous/basic-javascript-quiz.html amazing!

edit: column/piller this: (not sure).

var c=document.getelementbyid("mycanvas"); var ctx=c.getcontext("2d"); ctx.fillstyle="#ff0000"; ctx.fillrect(0,0,150,100);

edit 2: 

<script> var score = 0; var questions = [     ['how many moons earth have?', 1],     ['how many moons saturn have?',31],     ['how many moons venus have?', 0] ];  (var i=0; i<questions.length; i++) {  askquestion(questions[i]); } function askquestion(question) {  var answer = prompt(question[0],'');     if (answer == question[1]) {         alert('correct!');         score++;     } else {         alert('sorry. correct answer ' + question[1]);     } }   </script> </head>  <body> <script>     var message = 'you got ' + score;     message += ' out of ' + questions.length;     message += ' questions correct.';     document.write('<p>' + message + '</p>'); </script>  <canvas id="mycanvas"> </canvas>  </body> </html>

here's code started.

review code , apply link in question.

then start learning test!!

given array holding count of correct answers each question...

// array holds count of correct responses each answer  var answers=[];  for(var i=0;i<answers.length;i++){      // how many correct answers question      correctcount=answers[i];      // make each bar 20 pixels apart on x-axis      answerx=i*20;      // bars grow same bottom line on y-axis      answery=150;      // bars same width      answerwidth=10;      // each bar 10 pixels taller each correct answer      answerheight=correctcount*10;      // draw bar     // negative answerheight cause bar draw     // upward instead of usual downward      ctx.fillrect(answerx,answery,answerwidth,-answerheight);  }

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