Phiên bản đầy đủ: jsB@nk » Tính toán » Toán học » Tính chu vi, diện tích
URL: https://www.javascriptbank.com/pi-machine.html
Hiệu ứng có thể tính chu vi, diện tích của một số hình với số chữ số thập phân có thể lên tới 9.
Phiên bản đầy đủ: jsB@nk » Tính toán » Toán học » Tính chu vi, diện tích
URL: https://www.javascriptbank.com/pi-machine.html
<script>// Ben Joffe by http://www.joffe.tk/function roundnum(pinum){var numtimes=0;var currentpower=1;var currentround;while (numtimes<rounding.options.selectedIndex) {currentpower=currentpower*10;numtimes=numtimes+1;}currentround=Math.round(pinum*currentpower)/currentpower;return currentround;}function show(what){showfield.innerHTML=what;}function workcircle(){if (circleradius.value=="") circleradius.value="0";var pinum=roundnum(Math.PI*circleradius.value*circleradius.value);show("The area of a circle with a radius of "+circleradius.value+":<br><input type=text size=20 value="+pinum+"> units squared.");}function workcircle2(){if (circleradius.value=="") circleradius.value="0";var pinum=roundnum(2*Math.PI*circleradius.value);show("The circumference of a circle with a radius of "+circleradius.value+":<br><input type=text size=20 value="+pinum+"> units.");}function worksphere(){if (sphereradius.value=="") sphereradius.value="0";var pinum=roundnum(4*Math.PI*sphereradius.value*sphereradius.value*sphereradius.value/3)show("The volume of a sphere with a radius of "+sphereradius.value+":<br><input type=text size=20 value="+pinum+"> units cubed.");}function worksphere2(){if (sphereradius.value=="") sphereradius.value="0";var pinum=roundnum(4*Math.PI*sphereradius.value*sphereradius.value);show("The surface area of a sphere with a radius of "+sphereradius.value+":<br><input type=text size=20 value="+pinum+"> units squared.");}function workcylinder(){if (cylinderradius.value=="") cylinderradius.value="0";if (cylinderheight.value=="") cylinderheight.value="0";var pinum=roundnum(Math.PI*cylinderradius.value*cylinderradius.value*cylinderheight.value);show("The volume of a cylinder with a base radius of "+cylinderradius.value+" and a height of "+cylinderheight.value+":<br><input type=text size=20 value="+pinum+"> units cubed.");}function workcylinder2(){if (cylinderradius.value=="") cylinderradius.value="0";if (cylinderheight.value=="") cylinderheight.value="0";var pinum=roundnum((2*Math.PI*cylinderradius.value*cylinderradius.value)+(2*Math.PI*cylinderradius.value*cylinderheight.value));show("The surface area of a cylinder with a base radius of "+cylinderradius.value+" and a height of "+cylinderheight.value+":<br><input type=text size=20 value="+pinum+"> units squared.");}function workcone(){if (coneradius.value=="") coneradius.value="0";if (coneheight.value=="") coneheight.value="0";var pinum=roundnum(Math.PI*coneradius.value*coneradius.value*coneheight.value/3);show("The volume of a cone with a base radius of "+coneradius.value+" and a height of "+coneheight.value+":<br><input type=text size=20 value="+pinum+"> units cubed.");}function workcone2(){if (coneradius.value=="") coneradius.value="0";if (coneheight.value=="") coneheight.value="0";var pinum=roundnum(Math.PI*coneradius.value*Math.sqrt((coneheight.value*coneheight.value)+((coneradius.value/2)*(coneradius.value/2))));show("The surface area of a cone with a base radius of "+coneradius.value+" and a height of "+coneheight.value+":<br><input type=text size=20 value="+pinum+"> units squared.");}</script><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com--><div style="text-align: left;">Round to <select size="1" id="rounding"><option>0</option><option>1</option><option selected="selected">2</option><option>3</option><option>4</option><option>5</option><option>6</option><option>7</option><option>8</option><option>9</option></select> decimal points.<br><br><b>Circle<br></b>Radius: <input type="text" size="14" name="circleradius" maxlength="10" onkeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;"><input type="button" value="Area" onclick="workcircle()"><input type="button" value="Circumference" onclick="workcircle2()"><p><b>Sphere</b><br>Radius: <input type="text" size="14" name="sphereradius" onkeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;"><input type="button" value="Volume" onclick="worksphere()"> <input type="button" value="Surface Area" onclick="worksphere2()"></p><p><b>Cylinder</b><br>Radius of base: <input type="text" size="14" name="cylinderradius" onkeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;">height: <input type="text" size="14" name="cylinderheight" onkeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;"><input type="button" value="Volume" onclick="workcylinder()"> <input type="button" value="Surface Area" onclick="workcylinder2()"></p><p><b>Cone</b><br>Radius of base: <input type="text" size="14" name="coneradius" onkeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;"> height: <input type="text" size="14" name="coneheight" onkeypress="if (event.keyCode < 46 || event.keyCode > 57 || event.keyCode==47) event.returnValue = false;"><input type="button" value="Volume" onclick="workcone()"> <input type="button" value="Surface Area" onclick="workcone2()"></p><hr><p id="showfield" align="center"></p></div><!-- This script downloaded from www.JavaScriptBank.com Come to view and download over 2000+ free javascript at www.JavaScriptBank.com-->