Solved

# Programming tips

Posted on 2009-07-06
310 Views
There once was a wise servant who saved the life of a princess. The king promised to pay whatever the servant could dream up. Knowing that the king loved chess, the servant told the king he would like to have grains of wheat. One grain on the first square of a chess board. Two grains on the next. Four on the third, and so on.

There are 64 squares on a chessboard.

Write a program that shows how many grains were on each square and the total number of grains.

In other words, I want to type

java Grains

and see

square 1:  1 grain
square 2:  2 grains
square 3:  4 grains
square 4:  8 grains

etc.

public class Chess {
public static void main(String[] args) {
try{
int enteredNumber = Integer.parseInt(args[0]);
if( enteredNumber < 1 || enteredNumber > 64){
System.out.print("invalid numbers");
System.exit(0);
}
int numberOfSquares = (int)Math.pow(2, (enteredNumber - 1));
System.out.println(numberOfSquares);
}catch(NumberFormatException e){
e.printStackTrace();
}
}
}
0
Question by:SunScreenCert
[X]
###### Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

• Help others & share knowledge
• Earn cash & points
1 Comment

LVL 20

Accepted Solution

a_b earned 500 total points
ID: 24791766
Run a for loop from 0 to 63 that does the calculation for you
for(int i=0;i<64;i++)
{
numberOfSquares = (int) Math.pow(2,i);
sysout(numberOfSquares);
}

Right now the program is only running for a single number you need to change the dependency on the args[0].
0

## Featured Post

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Java had always been an easily readable and understandable language.  Some relatively recent changes in the language seem to be changing this pretty fast, and anyone that had not seen any Java code for the last 5 years will possibly have issues unde…
Introduction Java can be integrated with native programs using an interface called JNI(Java Native Interface). Native programs are programs which can directly run on the processor. JNI is simply a naming and calling convention so that the JVM (Java…
Viewers will learn about arithmetic and Boolean expressions in Java and the logical operators used to create Boolean expressions. We will cover the symbols used for arithmetic expressions and define each logical operator and how to use them in Boole…
This tutorial covers a step-by-step guide to install VisualVM launcher in eclipse.
###### Suggested Courses
Course of the Month2 days, 22 hours left to enroll