cast (int) does not work correctly

Question

I initialized a double a with Math.pow(10,24). Now I need to convert double a to int b:

a = Math.pow(10,24)
int b = (int)a;
System.out.println(a);
System.out.println(b);

System prints out :

1.0E24
2147483647

This result is obviously not correct.

BigInteger is your friend, although even this won't be 100% accurate given double's limitations. — Hovercraft Full Of Eels, Dec 28 '15 at 23:46
[Integer](https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html) max value of an Integer is 10^31 -1 or am i wrong? — plattfuß, Dec 29 '15 at 12:59

score 3 · Answer 1 · answered Dec 28 '15 at 23:46

3

It's because Integer has limit INT_MAX - 2147483647

answered Dec 28 '15 at 23:46

Invisible

OK, but what is `INT_MAX`? Where in Java is `INT_MAX` defined? – ajb Dec 29 '15 at 00:40
but why are INT_MAX and MAX_VALUE different? – plattfuß Dec 29 '15 at 13:02
you can read more about primitive data types like int here: [Click Here](https://docs.oracle.com/javase/tutorial/java/nutsandbolts/datatypes.html) – Invisible Dec 29 '15 at 21:13
Primitive data type int, and [Integer](https://docs.oracle.com/javase/7/docs/api/java/lang/Integer.html) class is different. – Invisible Dec 29 '15 at 21:38

1 Answers1