最近在做课程设计,源代码分享.用到以前学过的计算机组成原理,还有最新自学的Javascript
部分代码有参考学长的课程设计.
MainPage.HTML
[HTML] 纯文本查看 复制代码 <!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<title>IEEE754规格化数计算器</title>
<script type="text/javascript" src="./js/func.js"></script>
</head>
<body>
计算短浮点数(总位数32)的IEEE754数据<br>
本系统计算32位的IEEE754数据<br />
<form action="stooges.php">
<fieldset>
<p>
输入输出：<br/>
<input type="text" name="number" id="number"size="40" value="0">
</p>
<p>
<input type="button" id="Converter1" name="Converter1"
value="IEEE754二进制转十进制">
<input type="button" id="Converter2" name="Converter2"
value="十进制转IEEE754二进制">
</p>
</fieldset>
例如:IEEE单精度数代码11000010111001001000000000000000转换成十进制数值表示<br />
为-114.25<br />
</form>
</body>
</html>
JavaScript部分:
func.js
[JavaScript] 纯文本查看 复制代码
function ChangeToDecimalism() {
var num = IEEEToDec();
document.getElementById("number").value = num;
}
function ChangeToIEEE754() {
var num = DecToIEEE();
document.getElementById("number").value = num;
}
function DecToIEEE() {
var flag = 1;
var number = document.getElementById("number").value
var len = number.length
for (var i = 0; i < len; i++){
if (number[i] < '0' || number[i] > '9'){
if(number[i]=='.' || number[i]=='-')
continue;
else{
flag = 0;
break;
}
}
}
if (flag == 0){
alert("您输入的数据有误！");
}
else{
number = parseFloat(number);
var S = "";
var M = "";
var E = "";
if (number >= 0) {
S = 0;
}
else {
S = 1;
number = 0 - number;
}
M = number.toString(2);
E = M.indexOf(".");
if (E != -1) {
E = (E + 126).toString(2);
M = M.substring(1);
var mm = new Array(2);
mm = M.split(".");
M = mm[0] + mm[1];
var ml = M.length
for (var i = 0; i < 23 - ml; i++) {
M += "0";
}
}
else {
E = (M.length - 1 + 127).toString(2);
M = M.substring(1);
var temp = M.length
for (var i = 0; i < 23 - temp; i++) {
M += "0";
}
}
var newNumber = S + E + M;
return newNumber;
}
}
function IEEEToDec() {
var flag = 1;
var number = document.getElementById("number").value
var len = number.length;
if (len == 32) {
for (var i = 0; i < len; i++) {
if (number[i] < '0' || number[i] > '1') {
flag = 0;
break;
}
}
if (flag == 0) {
alert("您输入的数据不争确！");
}
else {
var S = number.substring(0, 1);
var E = number.substring(1, 9);
var M = number.substring(9, number.length);
E = parseInt(E, 2) - 127;
M = "1" + M;
temp1 = M.substring(0, E + 1);
temp2 = M.substring(E + 1, M.length);
m_int = parseInt(temp1, 2);
m_float = parseFloat("0." + temp2, 10).toString().substring(2, M.length);
var m_float2 = 0;
for (var i = 0; i < m_float.length; i++) {
var x = m_float.charAt(i);
m_float2 += parseFloat(x) * Math.pow(2, -(i + 1));
}
M = m_int + m_float2;
if (parseInt(S) == 1) {
M = 0 - M;
}
return M;
}
}
else
alert("请输入一个长度为32的二进制数。");
}
| 
发表于 2014-7-7 13:25
