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JavaScript - Integer Division
Frustrated by the fact that you don't have the integer division operator in JavaScript?
Here's a surprisingly little known method: parseInt(19/4) = 4 Now when a VBguru or vbscripter says "ha ha, I can integer divide and you can't!" You now know better. Similar TutorialsOut of curiosity: if I put that in address bar: Code: javascript: 128/1.618033988749894 that is ok, but what is calculated in this case ? Code: javascript: 128/1,618033988749894 Ok, im not going to show the whole code, for various reason but what I do display should be enough I am creating a program that will ask you how many people are on board the ship, how many people can fit in a lifeboat and how many lifeboats you have... The program will then calculate the minimum amount of lifeboats you will need to get everyone safely off board.... Heres my problem....Say it you input there are 800 people on board and only 90 people can fit per lifeboat, so you got 800/90 = 8.88 But you can't have it display as 8.88 because you can't have .88 lifeboats lol So instead of a double you make it an int, so it equals 8.... but you don't want it to equal 8 because then you'd be .88 lifeboats short, you want it to equal 9 so this is where IM truly stumped Heres a sample code of what I have Code: int minLb = peopleNumber/peoplePerLifeboat;
System.out.println("A minimum of " + minLb + " lifeboats are required to rescue everyone on board.");
And a sample of what it produces "Number of people on board the hg:800 Maximum number of people per lifeboat:90 Number of lifeboats that are available on the hg:7 Here are the results... A minimum of 8 lifeboats are required to rescue everyone on board. any help is appreciated Hi Someone know any script for division of words into syllables? Regards stickers Hi there. I have a program that generates a random exam with digits 0 -9. I have managed to generate random symbols to appear inbetween each question and it now accepts an answer. What i need is that when a division sum is generated, i need another field beside the answer for the remainder. Here is the code: <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"><!-- InstanceBegin template="/Templates/Brittanica Template.dwt" codeOutsideHTMLIsLocked="false" --> <head> <meta http-equiv="Content-Type" content="text/html; charset=utf-8" /> <!-- InstanceBeginEditable name="doctitle" --> <title>Untitled Document</title> <!-- InstanceEndEditable --> <!-- InstanceBeginEditable name="head" --> <style type="text/css"> <!-- .equals { color: #0F0; } --> </style> <!-- InstanceEndEditable --> <style type="text/css"> <!-- body { background-image: url(../Images/blackboard.jpg); } #Main_div { height: 700px; width: 680px; margin: auto; position: relative; top: auto; padding: 0px; } #header_div { height: 179px; width: 660px; position: relative; left: auto; top: auto; right: auto; bottom: auto; margin: auto; } #body_div { height: 550px; width: 660px; position: relative; margin: auto; } body,td,th { color: #FFF; } --> </style></head> <body> <div id="Main_div"> <div id="header_div"><img src="../Images/math.png" width="660" height="179" /></div> <!-- InstanceBeginEditable name="EditRegion3" --> <script language="javascript" type="application/javascript"> function runCode() { document.getElementById("txt_sum11").value = rndNumber(); document.getElementById("txt_sum12").value = rndNumber(); document.getElementById("txt_sum21").value = rndNumber(); document.getElementById("txt_sum22").value = rndNumber(); document.getElementById("txt_sum31").value = rndNumber(); document.getElementById("txt_sum32").value = rndNumber(); document.getElementById("txt_sum41").value = rndNumber(); document.getElementById("txt_sum42").value = rndNumber(); document.getElementById("txt_sum51").value = rndNumber(); document.getElementById("txt_sum52").value = rndNumber(); genOperators(); document.getElementById("hiddenField1").value = eval(document.getElementById("txt_sum11").value + document.getElementById("symbol1").value + document.getElementById("txt_sum12").value) document.getElementById("hiddenField2").value = eval(document.getElementById("txt_sum21").value + document.getElementById("symbol2").value + document.getElementById("txt_sum22").value) document.getElementById("hiddenField3").value = eval(document.getElementById("txt_sum31").value + document.getElementById("symbol3").value + document.getElementById("txt_sum32").value) document.getElementById("hiddenField4").value = eval(document.getElementById("txt_sum41").value + document.getElementById("symbol4").value + document.getElementById("txt_sum42").value) document.getElementById("hiddenField5").value = eval(document.getElementById("txt_sum51").value + document.getElementById("symbol5").value + document.getElementById("txt_sum52").value) } function rndNumber(){ var returnNumber; returnNumber = Math.floor(Math.random()*11); return returnNumber; } function validateCode(){ var val1 = document.getElementById("txt_answer1").value var val2 = document.getElementById("hiddenField1").value if (val1 == val2){ alert("First answer is correct") } var val1 = document.getElementById("txt_answer2").value var val2 = document.getElementById("hiddenField2").value if (val1 == val2){ alert("Second answer is correct") } var val1 = document.getElementById("txt_answer3").value var val2 = document.getElementById("hiddenField3").value if (val1 == val2){ alert("Third answer is correct") } var val1 = document.getElementById("txt_answer4").value var val2 = document.getElementById("hiddenField4").value if (val1 == val2){ alert("Fourth answer is correct") } var val1 = document.getElementById("txt_answer5").value var val2 = document.getElementById("hiddenField5").value if (val1 == val2){ alert("Fifth answer is correct") } } function genOperators(){ for (var i = 1 ; i <= 5 ; i++){ var operator = Math.floor(Math.random()*4)+1; var actualOp = ""; switch(operator){ case 1: actualOp = "+"; break; case 2: actualOp = "-"; break; case 3: actualOp = "/"; break; case 4: actualOp = "*"; break; } document.getElementById("symbol"+i).value = actualOp; } } </script> <style type="text/css"> <!-- body { background-color: #999; } body,td,th { font-weight: bold; color: #900; } --> </style> <form id="form1"> <center> <input type="button" name="btn_getNumber" value="Click here to begin" onclick="runCode()"/> </center><br/> <center> <input type="text" name ="txt_sum11" id="txt_sum11" /> <input name="symbol1" type="text" id="symbol1" size="1" maxlength="1" /> <input type="text" name ="txt_sum12" id="txt_sum12" /> <span class="equals">=</span> <input type="text" name ="txt_answer1" id="txt_answer1" /> <input type="hidden" name="txt_actualAnswer1" id="hiddenField1" /> </center><br/> <center> <input type="text" name ="txt_sum21" id="txt_sum21" /> <input name="symbol2" type="text" id="symbol2" size="1" maxlength="1" /> <input type="text" name ="txt_sum22" id="txt_sum22" /> <span class="equals">=</span> <input type="text" name ="txt_answer2" id="txt_answer2" /> <input type="hidden" name="txt_actualAnswer2" id="hiddenField2" /> </center><br/> <center><input type="text" name ="txt_sum31" id="txt_sum31" /> <input name="symbol3" type="text" id="symbol3" size="1" maxlength="1" /> <input type="text" name ="txt_sum32" id="txt_sum32" /> <span class="equals">=</span> <input type="text" name ="txt_answer3" id="txt_answer3" /> <input type="hidden" name="txt_actualAnswer3" id="hiddenField3" /> </center><br/> <center><input type="text" name ="txt_sum41" id="txt_sum41" /> <input name="symbol4" type="text" id="symbol4" size="1" maxlength="1" /> <input type="text" name ="txt_sum42" id="txt_sum42" /> <span class="equals">=</span> <input type="text" name ="txt_answer4" id="txt_answer4" /> <input type="hidden" name="txt_actualAnswer4" id="hiddenField4" /> </center><br/> <center><input type="text" name ="txt_sum51" id="txt_sum51" /> <input name="symbol5" type="text" id="symbol5" size="1" maxlength="1" /> <input type="text" name ="txt_sum52" id="txt_sum52" /> <span class="equals">=</span> <input type="text" name ="txt_answer5" id="txt_answer5" /> <input type="hidden" name="txt_actualAnswer5" id="hiddenField5" /> </center><br/> <center> <p> <input type="button" name="btn_submit" value="Submit Answers" onclick="validateCode()"/> </p> </center> </form> <!-- InstanceEndEditable --></div> </body> <!-- InstanceEnd --></html> I also need to know how i would display all of the results of the test. For example "You got - 5 out of 5" "Time Taken - 3 minutes" "Date - 24-06-2011" Thank you. Can someone point me in the right direction for using Javascript to increase a number over time without refreshing the page? I also need it to continually go up, and not start at 0 on every refresh. Is this possible? Blockis In some cases toPrecision(X) will result in an integer value, which is the expected result. However, it is typical in some fields to always follow the integer value with a decimal and zero (i.e 522 --> 522.0). Technically, this would be incorrect since it would imply an extra digit of precision that does not exist. However, this is often disregarded, provided there are sufficient number of digits (i.e. precision of 5+). That said, is there any way to force an integer result to have a trailing ".0"? Hi all, this is my first post to this great useful forum. I have a javascript 2d array [x,y] that contains integer values like this: [0,0], [0,1], [0,2], [0,3], [1,0], [1,1], [1,2], [2,0], [2,1], [2,2], [0,-1], [0,-2], [0,-3], [1,-1], [1,-2], [2,-3] my question is how to get the max,min y value for each x. for the sample above it should give me another array with the following results [0,3],[0,-3],[1,2],[1,-2],[2,2],[2,-3] your help is highly appreciated Regards Omran Hi all, I am having a problem converting a physical string to a integer. I have a dropdown list of a few items but are numbers though in chracters. I ned to output the value and the text of the selected item. As I cannot use a if-else statement, any help would be great. Code: <select id="std_num" onchange="displayValue()">
<option value="Two">Two</option>
<option value="Zero">Zero</option>
<option value="Five">Five</option>
<option value="Three">Three</option>
<option value="Two">Two</option>
<option value="Zero">Zero</option>
</select>
Code: function displayValue()
{
alert(document.getElementById('std_num').value);
var c = (document.getElementById('std_num').value);
}
Hi, I was hoping you could help me, I was wanting to write text to the screen but without re-writing the whole screen (e.g. document.write();. I wish to take text and put it in a function, modify it, then display it. So far I have: Code: <script type = "text/javascript">
function calculate(text){
var x = "10.0";
var gpa = text.replace(/0.0/g,x);
document.getElementById("text").innerText=gpa;
}
</script>
<p id = text >Your Grade Point Average (GPA) is: 0.0</p>
<button type="button" onclick="calculate(text)">Calculate</button>
Your help would be really appreciated Does JavaScript have an easy of converting an ordinary integer like 135 into a time format like 02:15? I'm working on a timer that handles the backend with just a plain integer that counts down every second but it needs to output looking like a clock.
OVERVIEW of main webpage: when a user logs in, they will be directed to the main page of the website; and will see images displayed according to a value that was stored in the database. the main page preloads an image array: Code: <script type="text/javascript">
var img_FILE = [ 'images/house.png',
'images/car.png',
'images/boat.png'
];
</script>
easy enough the database holds a column of integers that are used to access the proper image in the array. i can successfully pull the integer value i need from the db. what i want to do is when the main page loads, i want the value that was pulled from the database to be used to display the correct image. example: lets say i pulled the value 2 from the db. then i want to display img_FILE[2] on the main page when the page "loads". Code: <body>
<div id="quadrantOne">
<img id="firstImg" src="images/blankImg.png" width="190" height="235" />
<script type="text/javascript">
$.post('imageScript.php', 'data=0', function(data,status){
if (status == 'success') { imgValue = data }
else { imgValue = 'error' }
document.getElementById('firstImg').src=img_FILE[imgValue];
});
</script>
</div>
</body>
i debugged imgValue and it is correctly assigned the value coming from the db. but..........the image won't appear on the main page. any ideas how to get this to work? thanks, Paul Williams Well I have an array and a button to select a random integer from the array, how do I make it so that it selects every integer once til all are selected, then it starts over again? For example, an array has these: A B 1 2 Q F So you press the button a number of times, and you get: Q B 1 F A 2 Instead of: 1 Q A 1 B A I have some asp:radiobutton lists that need to update a label with the sum of their values each time a user selects a new value. I am brand new to javascripting and would like some insight on how to get this done. I have inserted my code below. Code: <asp:Label runat="server" Text="Greeting:" /> <asp:Label runat="server" ForeColor="Red" ID="lbl_GreetingScore" Text="0" /> <asp:RadioButtonList ID="rdb1_1" runat="server" RepeatDirection="Horizontal"> <asp:ListItem Selected="True" Text="N/A" Value="4" /> <asp:ListItem Text="Yes" Value="4" /> <asp:ListItem Text="No" Value="0" /> </asp:RadioButtonList> Another homework assignment that I can't quite seem to get to work... I've been asked to do the following using javascript: -Create a function named randInt() with one parameter of "size". Declare a variable named "rNum" equal to a random integer between 1 and the value of the size variable. Return the value of the "rNum" varialbe from the function. -Create a function named getQuote() with one parameter anemd "qNum". The function should create an array named mtQuotes with five quotes; there should be no quote for the array index "0". Return the value of the mtQuotes array for the qNum index. - In the div element of "quotes" insert a script with the following commands: Declare a variable named "randValue" which is euqal to a random integer between 1 and 5 (use the randInt() function). Declare a variable named "quoteText" containing the quote whose array index value is equal to randValue. Write the value of quoteText to the web page. Here is what I have...it returns undefined. thanks. Code:
<html>
<head>
<script type="text/javascript">
function randInt(size) {
var rNum=Math.ceil(Math.random()*5);
return(rNum);
}
</script>
<script type="text/javascript">
function getQuote(qNum);
var mtQuotes = new Array();
mtQuotes[0] = "";
mtQuotes[1] = "I smoke in moderation, only one cigar at a time.";
mtQuotes[2] = "Be careful of reading health books, you might die of a misprint.";
mtQuotes[3] = "Man is the only animal that blushes or needs to.";
mtQuotes[4] = "Clothes make the man. Naked people have little or no influence on society.";
mtQuotes[5] = "One of the most striking differences between a cat and a lie is that a cat has only nine lives.";
return mtQuotes[qNum];
</script>
</head>
<body>
<div id="quotes">
<script type="text/javascript">
var randValue=randInt(5);
var quoteText=getQuote(randValue);
document.write(quoteText);
</script>
</div>
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