syntax error, unexpected '–' (T_STRING)

Question

I have a function i.e

function cdec($num) {
for ($n = 0 ; $n < strlen($num) ; $n++) {
$temp = $num[$n];
$dec = $dec + $temp*pow(2 , strlen($num) – $n – 1);
}
return $dec;
}

When I am going to run my code then it is showing me this error

Parse error: syntax error, unexpected '–' (T_STRING)

I don't understand where is my fault. It is showing error in this line

$dec = $dec + $temp*pow(2 , strlen($num) – $n – 1);

I have make it like $dec = $dec + $temp*pow(2 , strlen($num) ( - ) $n ( – ) 1); still showing me another errror Parse error: syntax error, unexpected '(' in — Indresh Tayal, Jan 12 '17 at 07:40
@IndreshTayal Yeah, but you need to change that back to a `-` character. — MC Emperor, Jan 12 '17 at 07:41
@IndreshTayal Please use the **edit** link below your question and add the [tag:php] tag. — MC Emperor, Jan 12 '17 at 07:42
Hi Indresh In regards to your previous comment, Arithmetic Operators do not work inside Parenthesis (Brackets) alone, they need data to operate on. What I mean by this is: 1 ( + ) 1; will not work. (1 + 1 ); will work. 1 + 1; will work; The issue, as pointed out by Naveed Ramzan, is that you are not using minus signs (-) but hyphens instead, which are for use in literacy. While I do not come with the answer myself, it was important to correct your use of brackets around Arithmetic Operators. — Michael Thompson, Jan 12 '17 at 08:01

Naveed Ramzan · Answer 1 · 2017-01-12T08:04:09.927

0

Try this

function cdec($num) {
    $dec = '';
    for ($n = 0 ; $n < strlen($num) ; $n++) {
        $temp = $num[$n];
        $dec = $dec + $temp*pow(2 , strlen($num) - $n - 1);
    }
    return $dec;
}

Both Minus signs were in fact Hyphen signs.

edited Jan 12 '17 at 08:04

answered Jan 12 '17 at 07:54

Naveed Ramzan

3,565
3
25
30

I have used you function, Now It is showing Undefined variable: dec – Indresh Tayal Jan 12 '17 at 08:01
OK in fact, that is because we were defined $dec in loop. so I defined in before loop and now see. – Naveed Ramzan Jan 12 '17 at 08:04
Thanks, Now it is working properly – Indresh Tayal Jan 12 '17 at 09:02
Welcome, you can mark answer and also upvote. – Naveed Ramzan Jan 12 '17 at 09:11

score -1 · Answer 2 · answered Jan 12 '17 at 08:16

-1

Use parenthesis to separate math operations:

function cdec($num) {
    $dec = 0;
    for ($n = 0 ; $n < strlen($num) ; $n++) {
        $temp = $num[$n];
        $dec = $dec + ($temp*(pow(2 , ((strlen($num) - $n) - 1))));
    }
    return $dec;
}

answered Jan 12 '17 at 08:16

oliver

51
1
6

syntax error, unexpected '–' (T_STRING)

2 Answers2