Saturday, November 9, 2013

Java: Use BigInteger in for-loop

In my previous post, I mentioned a way to handle large integers by using BigInteger. Now I'm going to provide a very important usage of it. We often use for-loop. So here is the way to use it:

Ordinary integers:
for(int i = 1; i <= n; i++) {
 //Task to do
}

BigInteger:
for (BigInteger bi = BigInteger.valueOf(1);
                bi.compareTo(n) <= 0;
                bi = bi.add(BigInteger.ONE)) {
//Task to do
}
here n is a BigInteger variable.

Java: BigInteger

java

Many of you might have wondered, as I did, how to deal with integers of say more than 50 digits or so. And might have thought about breaking the integer into parts or storing it in a string and parse letter-by-letter.
Java provides a class for such large numbers: BigInteger.
You can find it in the package: java.math.BigInteger
We can do some operations like addition, subtraction, multiplication, division etc, but slightly in a different way.
For detailed information on its usage, have a look at this.

Wednesday, November 6, 2013

Eclipse: No Applicable Items on File | New

Today I tried to a new project in eclipse and on clicking
File>New> 
I found
<No Applicable Items>
I'm not able to create any kind of project. Then I found a solution on ecipse discussion group.
There are some selections in the IDE in the upper right corner; Java, JAVA EE and Resource etc. It was set to Java EE. When I selected JAVA, I can now create new projects again