A Fun Perfect Square Checker Using Integer Arithmetic Only... ;o) Post: 302952551

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Operating Systems OS X (Apple) A Fun Perfect Square Checker Using Integer Arithmetic Only... ;o) Post 302952551 by Don Cragun on Wednesday 19th of August 2015 05:40:35 PM

08-19-2015

Registered User

On the same system, using ksh instead of bash, try:

Code:

#!/bin/ksh
# perfect_square <number>
number=$1
if [ "$number" -eq "$((int(number)))" ] > /dev/null 2>&1 
then
	if [ "$number" -lt 0 ]
	then
		echo "Warning! Integer is negative!!!"
		echo "Set input integer to the DEMO value of 99..."
		number=99
	fi
else
	echo "Invalid Argument! Set input integer to the DEMO value of 100..."
	number=100
fi
root=$((int(number ** .5)))
square=$((root ** 2))
if [ $square -eq $number ]
then
	echo "$number is the perfect square of $root..."
	exit 0
else
	echo "Integer $number is not a perfect square..."
	exit 1
fi

PS Timing the script:

Code:

time perfect_square 90000000000
90000000000 is the perfect square of 300000...

real	0m0.00s
user	0m0.00s
sys	0m0.01s

Unfortunately, however, this only works with a 1993 or later version of ksh.

Last edited by Don Cragun; 08-19-2015 at 06:48 PM.. Reason: Adding timing results (11 seconds vs. .01 seconds) and disclaimer.

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LEARN ABOUT PHP

posix_setuid

POSIX_SETUID(3) 							 1							   POSIX_SETUID(3)

posix_setuid - Set the UID of the current process

SYNOPSIS

       bool posix_setuid (int  $uid)

DESCRIPTION

	Set  the real user ID of the current process. This is a privileged function that needs appropriate privileges (usually root) on the system
       to be able to perform this function.

PARAMETERS

	      o $uid
		- The user id.

RETURN VALUES

	Returns TRUE on success or FALSE on failure.

EXAMPLES

       Example #1

	      posix_setuid(3) example

	      This example will show the current user id and then set it to a different value.

	      <?php
	      echo posix_getuid()."
"; //10001
	      echo posix_geteuid()."
"; //10001
	      posix_setuid(10000);
	      echo posix_getuid()."
"; //10000
	      echo posix_geteuid()."
"; //10000
	      ?>

SEE ALSO

       posix_setgid(3), posix_seteuid(3), posix_getuid(3), posix_geteuid(3).

PHP Documentation Group 													   POSIX_SETUID(3)