Interesting TCL behavior: 007 == 7 is true; 008==8 is false. Post: 302254250

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Top Forums Shell Programming and Scripting Interesting TCL behavior: 007 == 7 is true; 008==8 is false. Post 302254250 by sarwan on Tuesday 4th of November 2008 01:59:25 AM

11-04-2008

Registered User

Interesting TCL behavior: 007 == 7 is true; 008==8 is false.

Hi all,
If anyone has the explanation for the following issue, please share it with me.

I am comparing two variable a and b with the values of 007 and 7, for these values it get evaluated as True. For a=008 and b=8, for these values it get evaluated as false.

#!/bin/tclsh
set a 007
set b 7
if { $a == $b } {
puts "$a equals to $b"
} else {
puts "$a not equals to $b"
}
set a 008
set b 8
if { $a == $b } {
puts "$a equals to $b"
} else {
puts "$a not equals to $b"
}

Output:
007 equals to 7
008 not equals to 8

In Fact a = (001,002,...007) and b= (1,2,...7) it get evaluated as True and becomes false for a > 007 and b > 7.

Thanks
Sarwan

sarwan

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is_string

IS_STRING(3)								 1							      IS_STRING(3)

is_string - Find whether the type of a variable is string

SYNOPSIS

       bool is_string (mixed  $var)

DESCRIPTION

	Finds whether the type given variable is string.

PARAMETERS

	      o $var
		- The variable being evaluated.

RETURN VALUES

	Returns TRUE if $var is of type string, FALSE otherwise.

EXAMPLES

       Example #1

	      is_string(3) example

	      <?php
	      $values = array(false, true, null, 'abc', '23', 23, '23.5', 23.5, '', ' ', '0', 0);
	      foreach ($values as $value) {
		  echo "is_string(";
		  var_export($value);
		  echo ") = ";
		  echo var_dump(is_string($value));
	      }
	      ?>

	      The above example will output:

	      is_string(false) = bool(false)
	      is_string(true) = bool(false)
	      is_string(NULL) = bool(false)
	      is_string('abc') = bool(true)
	      is_string('23') = bool(true)
	      is_string(23) = bool(false)
	      is_string('23.5') = bool(true)
	      is_string(23.5) = bool(false)
	      is_string('') = bool(true)
	      is_string(' ') = bool(true)
	      is_string('0') = bool(true)
	      is_string(0) = bool(false)

SEE ALSO

       is_float(3), is_int(3), is_bool(3), is_object(3), is_array(3).

PHP Documentation Group 													      IS_STRING(3)