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float result

Vishnu Prakash
Ranch Hand

Joined: Nov 15, 2004
Posts: 1026


o/p ==> -46

Please explain the o/p


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Ravi Shankar R
Greenhorn

Joined: Jan 05, 2005
Posts: 7
when the value of int i is assigned to float f the value of f is 1.234567936E9 since the change has happened from an integer literal to double literal so i = 1234567890 and f = 1.234567936E9

thus, i - f = 1234567890 - 1.234567936E9 = -46


Rupak Khurana
Ranch Hand

Joined: Mar 01, 2005
Posts: 89
How did you come up with f = 1.234567936E9 ?


SCJP 1.5<br />SCWCD 1.4
Jay Pawar
Ranch Hand

Joined: Aug 27, 2004
Posts: 411
Originally posted by vishnu prakash:


o/p ==> -46

Please explain the o/p


System.out.println(i - (int)f);
when you cast the float value f to int the resultant value is 1234567936
hence the value printed out is ( 1234567890 - 1234567936 ) which is -46


Cheers,<br />Jay<br /> <br />(SCJP 1.4)<br />Heights of great men were not achieved in one day, they were toiling day and night while their companions slept.
Pedro Henrique Pereira de Andrade
Greenhorn

Joined: Jul 05, 2005
Posts: 3

First, sorry for my serious bad inglish, but i'm tring.


The question is: why 1234567890 when converting to float is 1.234567936E9 ???



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Steven Bell
Ranch Hand

Joined: Dec 29, 2004
Posts: 1071
Floating point values are not accurate. Do a search on this forum for floating point accuracy, it has been discussed many times.
 
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