08-23-2002
I agree that compilers are free to optimise the way they like.But i was surprised to see exactly similar behaviour for c and c++ respectively on VC++ ,Turbo,gnu,aCC compilers.
All changed value of constant in C compilation but the value remained same in C++ compilation.
similarly for array index being declared with constant.
Why all the vendors opted for such behaviour made me suspect if their is some standard.
shobhit
3 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
is it possible to use eval to create constants in perl? i cannot seem to get anything to work, and my searches are turning up little to nothing. an example of what i am trying to do is this:
2 arrays:
array 1: 'FOOD','NUMBER','OS'
array 2: 'pizza','two','unix'
loop through the arrays and... (5 Replies)
Discussion started by: effigy
5 Replies
2. Programming
This might be a silly question, but I thought I'd ask anyway. If I'm writing in C, isn't it more efficient to, for instance, use constant character variable set to 'A' instead of hard-coding a character 'A'? Since it's only a single character instead of a string, it might not matter much. (10 Replies)
Discussion started by: cleopard
10 Replies
3. UNIX for Dummies Questions & Answers
Hello there,
I'd like to define a variable b equal to 0.5/a where a=0.001, so I wrote something like that:
a=0.001;
let 'b=0.5/$a';
but it doesn't work... maybe because the variable a has a real value???
Any help will be appreciated!!!:D (1 Reply)
Discussion started by: Giordano Bruno
1 Replies
CONSTANT(3) 1 CONSTANT(3)
constant - Returns the value of a constant
SYNOPSIS
mixed constant (string $name)
DESCRIPTION
Return the value of the constant indicated by $name.
constant(3) is useful if you need to retrieve the value of a constant, but do not know its name. I.e. it is stored in a variable or
returned by a function.
This function works also with class constants.
PARAMETERS
o $name
- The constant name.
RETURN VALUES
Returns the value of the constant, or NULL if the constant is not defined.
ERRORS
/EXCEPTIONS
An E_WARNING level error is generated if the constant is not defined.
EXAMPLES
Example #1
constant(3) example
<?php
define("MAXSIZE", 100);
echo MAXSIZE;
echo constant("MAXSIZE"); // same thing as the previous line
interface bar {
const test = 'foobar!';
}
class foo {
const test = 'foobar!';
}
$const = 'test';
var_dump(constant('bar::'. $const)); // string(7) "foobar!"
var_dump(constant('foo::'. $const)); // string(7) "foobar!"
?>
SEE ALSO
define(3), defined(3), The section on Constants.
PHP Documentation Group CONSTANT(3)