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Top Forums Shell Programming and Scripting validating variables (numeric) Post 302097719 by pjd1 on Tuesday 28th of November 2006 07:28:44 AM
Old 11-28-2006
validating variables (numeric)

Hi

I need to get a user to enter a number (an exchange rate) into a script. I have the following:

#!/bin/ksh
echo "Enter exchange rate:"
read EX_RATE
if [ -z "`echo \"$EX_RATE\" | tr -d \"[:digit:]\"`" ]
then
echo "Well done - only numeric here"
else
echo "Not so well done - there is NON numeric stuff here!"
fi

This works fine except when I try to enter a decimal number when it exits because the decimal point is obviously non-numeric. I have looked at the other class keywords and there is not one that covers decimals.

Can anyone help me out here?

thanks

Paul
 

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DECHEX(3)								 1								 DECHEX(3)

dechex - Decimal to hexadecimal

SYNOPSIS
string dechex (int $number) DESCRIPTION
Returns a string containing a hexadecimal representation of the given unsigned $number argument. The largest number that can be converted is PHP_INT_MAX * 2 + 1 (or -1): on 32-bit platforms, this will be 4294967295 in decimal, which results in dechex(3) returning ffffffff. PARAMETERS
o $number - The decimal value to convert. As PHP's integer type is signed, but dechex(3) deals with unsigned integers, negative integers will be treated as though they were unsigned. RETURN VALUES
Hexadecimal string representation of $number. EXAMPLES
Example #1 dechex(3) example <?php echo dechex(10) . " "; echo dechex(47); ?> The above example will output: a 2f Example #2 dechex(3) example with large integers <?php // The output below assumes a 32-bit platform. // Note that the output is the same for all values. echo dechex(-1)." "; echo dechex(PHP_INT_MAX * 2 + 1)." "; echo dechex(pow(2, 32) - 1)." "; ?> The above example will output: ffffffff ffffffff ffffffff SEE ALSO
hexdec(3), decbin(3), decoct(3), base_convert(3). PHP Documentation Group DECHEX(3)
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