Why there is a difference Between the Output of the two similar PHP Code

Asked Sep 10 '18 at 06:00

Active Sep 10 '18 at 06:22

Viewed 57 times

PHP Code 1

<?php 
 $a = 0.03;
 $b = 0.01 + 0.02;
 var_dump($a == $b);
?>

Output 1

bool(true)

PHP Code 2

<?php 
 $a = 0.3;
 $b = 0.1 + 0.2;
 var_dump($a == $b);
?>

Output 2

bool(false)

What is the Difference between the above two codes, Why its lead to two different Output. Can anyone please provide me the explanation which i seek. I am kind of Confused by looking at this.

edited Sep 10 '18 at 06:22

Suriya Prakash.M

asked Sep 10 '18 at 06:00

Abdul Rahim Shaikh

Replace 0.1 and add 0.01 in second code – Jaydev Vara Sep 10 '18 at 06:05
output is correct , but mistake in your variable – Jaydev Vara Sep 10 '18 at 06:05
check and compare both variable – Jaydev Vara Sep 10 '18 at 06:06
The reason is that is you go farther to the right of the decimal point, you get into smaller and smaller numbers. By the same token, 0.01 is less than 0.5 0.05 is less than 0.1, but more than 0.01. 0.004 is less than 0.01. – Sep 10 '18 at 06:08
@GauravNarula I totally know how the Decimal things work, My Question is about how there is a difference between the two output, According to me the output will be `bool(true)` for both the code. – Abdul Rahim Shaikh Sep 10 '18 at 06:33
because when you add 0.1+0.4 = 0.5 which is less than 1 means false. – Sep 10 '18 at 06:51

Why there is a difference Between the Output of the two similar PHP Code

0 Answers0