CODEWITHSUNDEEP
php
Nitish
Nitish

Reputation: 35

PHP arithmetic operation (addition)

floor( 500 * (1.4 / 100) ) gives me 6 and floor( 500 * 1.4 / 100 ) gives me 7

Can anyone help me understand how PHP arithmetic works internally.

Upvotes: 1

Views: 95

Answers (1)

Rafał Toboła
Rafał Toboła

Reputation: 376

It works like in any other language. Try for example javascript:

    (500*(1.4 / 100)) // this will give you 6.999999999999999
    (500* 1.4 / 100)  // this will give you 7

The problem is, that PHP has internal setting which tells him about precission with which he displays float numbers. Try doing something like that:

    php > ini_set('precision', 17);
    php > echo ( 500 * (1.4 / 100) );
    6.9999999999999991
    php > echo ( 500 * 1.4 / 100 );
    7
    php >

I assume you've tried the code above without ini_set (using default settings – probably 14 as precision), and it returned you 7 in both results:

    php > echo ( 500 * 1.4 / 100 );
    7
    php > echo ( 500 * (1.4 / 100) );
    7
    php >

Upvotes: 6

Related Questions