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Sep 3rd, 2007, 1:30 PM
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#1 |
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Newbie
Join Date: Sep 2007
Posts: 8
Rep Power: 0
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anyone can help me in this php problem?
i need to convert double or floating point to binary but this program only accepts integer value such as 2,3,10 and so on but doesnt accept 2.5,3.45,10.0023 and so on..can anyone help me in this so that it can accept all kind of numbers..thanks
here is the coding <?php
?>
<html>
<head>
<title>Binary Converter</title>
<style type="text/css">
<!--
P.error { margin-top: 0pt; color: red; font-weight: bold; }
TR.grey { background: #eeeeee; }
-->
</style>
</head>
<body>
<div align="center">
<h1>Decimal to Binary & Binary to Decimal Converter</h1>
<?php
// look for no POST entries, or the RESET button
if (count($_POST) == 0 or isset($_POST['reset'])) {
// POST array is empty - set initial values
$dec_input = null;
$dec_output = null;
$base2value = null;
} else {
// retrieve values from POST array
$dec_input = &$_POST['dec_input'];
$dec_output = null;
$base2value = &$_POST['base2value'];
} // if
// initialise array for validation errors
$error = array();
if (isset($_POST['dec-2-bin'])) {
$base2value = decbin($dec_input);
} // if
if (isset($_POST['bin-2-dec'])) {
$dec_output = bindec($base2value);
if ($error) {
$error['base2value'] = $error[0];
} // if
} // if
?>
<form action="<?php echo $_SERVER['PHP_SELF'] ?>" method="POST">
<table border="0">
<colgroup align="right">
<colgroup align="left">
<colgroup align="left">
<colgroup align="left">
<tr>
<td>Decimal (input)</td>
<td><input type="text" name="dec_input" value="<?php echo $dec_input ?>" />
<?php
if (array_key_exists('dec_input', $error)) {
echo '<p class="error">' .$error['dec_input'] .'</p>';
} // if
?> </td>
<td colspan="2"> </td>
</tr>
<tr>
<td>Decimal (output)</td><td colspan="3"><?php echo $dec_output ?></td>
</tr>
<tr class="grey">
<td>Binary (Base 2)</td>
<td><input type="text" name="base2value" value="<?php echo $base2value ?>" size="25" />
<?php
if (array_key_exists('base2value', $error)) {
echo '<p class="error">' .$error['base2value'] .'</p>';
} // if
?> </td>
<td><input type="submit" name="dec-2-bin" value="DEC to BIN" /></td>
<td><input type="submit" name="bin-2-dec" value="BIN to DEC" /></td>
</tr>
</table>
<p><input type="submit" name="reset" value="reset" /></p>
</form>
</div>
</body>
</html>
<?phpLast edited by big_k105; Sep 3rd, 2007 at 5:48 PM. |
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Sep 16th, 2007, 7:23 PM
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#2 |
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Newbie
Join Date: Sep 2007
Posts: 1
Rep Power: 0
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All Your Base Are Belong To Us
Hi, harryc
Don't give up hope. I've had this problem too. Not many seem to want to touch the non-integer base conversion problem. The same rules apply to all bases. I wrote two functions that you could call within your program that might solve your problem. The following two functions used together can convert a positive non-integer base 10 number into another base. This function converts positive base 10 integers into another base from 2 to 62.
function bcBase10_Int_To_BaseB($ArgN, $ArgB)
{
/*
This function performs a simple base conversion for
base 10 integers into any other base from 2 to 62.
Author: Jay Tanner ©2007
PHP v4.4.4
---------
ARGUMENTS
$ArgN = Positive base 10 integer string argument.
$ArgB = Base of output integer string. The base
can range from 2 to 62, but it is possible
to extend it further.
------
ERRORS
An error results if any argument is invalid,
in which case, boolean FALSE is returned.
*/
// Define digits available for the base conversions.
// NUMBERS ARE CONSIDERED CASE SENSITIVE WITH THE EXCEPTION OF DIGITS 0-9.
$digits = "0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
// Read input arguments and truncate
// to integer values if necessary.
$N = bcAdd(trim($ArgN), "0", 0);
$B = bcAdd(trim($ArgB), "0", 0);
// Error if base is outside valid range.
if ($B < 2 || $B > 62) {return FALSE;}
// Handle special case where N=0
if ($N == 0) {return 0;}
// Compute base B equivalent to
// original base 10 argument.
$out = "";
while ($N != 0)
{
// Compute and fetch current base B digit.
$d = SubStr($digits, bcMod($N, $B), 1);
// Collect current base B digit in
// leftmost output string position.
$out = "$d$out";
// Update $N value.
// Done when $N==0
// Otherwise, repeat
// using new $N value.
$N = bcDiv($N, $B, 0);
}
// Done.
return $out;
} // End of bcBase10_Int_To_BaseB()This function calls the function defined above and converts positive non-integer base 10 integers into another base from 2 to 62. function bcBase10_To_BaseB ($Base10ArgStr, $ToBaseArg)
{
/*
This function converts a non-integer base 10 value into
its equivalent in any other integer base.
The result can be up to 50 decimals.
Author: Jay Tanner ©2007
PHP v4.4.4
----------
DEPENDENCY
This function calls the bcBase10_Int_To_BaseB() integer
conversion function.
*/
// ---------------------
// Read input arguments.
$x = trim($Base10ArgStr);
$b = trim($ToBaseArg);
// ---------------------------------------------------
// Compute 200th power of base. For higher precision,
// increase the 200 to a higher value.
$q = "200";
$p200 = bcPow($b, $q);
// --------------------------------------------------------------
// Separate base 10 x argument into integer and fractional parts.
$dp = StrPos($x, "."); if ($dp === FALSE) {$x .= ".0"; $dp = StrPos($x, ".");}
$xInt = SubStr($x, 0, $dp); if ($xInt == "") {$xInt = "0";}
$xFrx = "0." . SubStr($x, $dp+1, StrLen($x));
// --------------------
// Compute new X value.
$X = bcMul($p200, $xFrx);
// --------------------------------------------------------
// Compute converted fractional digits minus decimal point.
$IntOut = bcBase10_Int_To_BaseB($xInt, $b);
$FrxOut = bcBase10_Int_To_BaseB($X, $b);
// ---------------------------------------
// Get length of fractional string result.
$FrxL = StrLen($FrxOut);
// -----------------------------------
// Compute number of zeros immediately
// following the decimal point.
$nZ = 200 - $FrxL;
// -------------------------------
// Construct string of ($nZ) zeros
// to follow the decimal point.
$zeros = Str_Repeat("0", $nZ);
// ------------------------------------
// Attach fractional sequence to zeros.
$FrxOut = "$zeros$FrxOut";
// --------------------------------------
// Truncate fractional part to 50 digits.
$FrxOut = SubStr($FrxOut, 0, 50);
// --------------------------------------
// Done. Return converted integer part
// attached to converted fractional part.
return "$IntOut.$FrxOut";
} // End of bcBase10_To_BaseB()EXAMPLE 1: Convert pi from base 10 to base 2 // Define pi to 64 decimals as a string. $pi = "3.1415926535897932384626433832795028841971693993751058209749445923"; print bcBase10_To_BaseB($pi, 2); // Result = 11.00100100001111110110101010001000100001011010001100 // to 50 decimals EXAMPLE 2: Convert e (Euler's constant) from base 10 to base 7 // Define e (Euler's constant) to 64 decimals as a string. $e = "2.718281828459045235360287471352662497757247093699959574966967627724077"; print bcBase10_To_BaseB($e, 7); // Result = 2.50124106542265043353530003006264426305144420013153 // to 50 decimals As with many ordinary decimal fractions, there may be a fuzz factor at the end of the fraction, since many fractions cannot be expressed exactly. Hope this is useful. Jay  |
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