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Posts: 2
Nickname: meka1
Registered: Feb, 2009
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Re: please some one help me
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Posted: Feb 5, 2009 6:00 PM
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/**
* Play the game of 24, where you are given 4 numbers and you must apply the
* basic mathematical operators (+, -, *, /) to the four numbers (using each
* number exactly once) to yield the value 24.
*
* Class: CS 102, Spring 2009
* Lab: Billie Joe Armstrong, Wed. 6:00 AM
* System: BlueJ 2.1.1, jsdk 1.5, Windows XP
*
* @author Dale Reed
* @version January 13, 2009
*
* Running the program looks like (where what the user thinks of is shown in parenthesis, but doesn't apear on screen:
*/
// Import libraries needed by the program
import java.util.Scanner; // used for console input
// Declare the class
public class TwentyFourB
{
// Fields that can be accessed anywhere in the class go here
Scanner keyboard = new Scanner( System.in); // used to read user input
//----------------------------------------------------------------------------- -----------
// main() - startup main loop. It is necessary to create an instance of this class
// and then call a method from that instance, otherwise there are all kinds
// of error messages having to do with non-static objects (e.g. keyboard)
// being called from a static context (e.g. main). By creating the instance
// and *then* using keyboard, it is not longer being called from a static
// context. Don't worry about understanding all this right now.
public static void main(String[] args)
{
// create an instance of this class
TwentyFourB theTwentyFourBInstance = new TwentyFourB();
// call a non-static method to do everything else
theTwentyFourBInstance.mainLoop();
}
//----------------------------------------------------------------------------- -----------
// mainLoop() - display identifying information and run main loop.
// In your program, you will only add code inside this method. You don't need to
// change anything above except for the comments at the top of the program.
//
void mainLoop()
{
// Display identifying information
System.out.println( "Author: Dale Reed \n" +
"Program: #1, TwentyFour \n" +
"TA: Englebert Humberdink, T 4-5 \n"+
"Jan 13, 2009");
System.out.println();
//Display game instructions and pause display
System.out.println( "Welcome to the game of TwentyFour. Choose one of the sets of 4 numbers below .\n" +
"You then need to use each of those four numbers exactly once, combining them somehow \n" +
"with the basic mathematical operators (+,-,*,/) to yield the value twenty-four. \n" +
"Possible sets of 4 numbers are: \n" +
" 8 5 7 5 9 8 \n" +
" 5 1 1 1 8 8 9 4 2 2 6 4 \n" +
" 8 6 2 3 5 2 \n" +
" \n");
// declare variables
String operator = ""; // stores user input
int number = 0;
int answer = 0;
// Prompt for and read in the 4 numbers to be used
System.out.print("Please enter the first number: ");
answer = keyboard.nextInt();
int loopCounter = 1; // value counts from 1..3, representing the 3 pairs of numbers to be used.
// execute the loop 3 times, since there are 3 operators to be applied
while( loopCounter <4) {
// find out which operator is to be used
System.out.print( "Enter the operator to be used (+,-,*, or /): ");
operator = keyboard.next(); // read user input
System.out.print( "Enter the next number: ");
number = keyboard.nextInt(); // read the next number
// apply the operator to the two values: answer and nextNumber
if( operator.equals("+") ) {
answer = answer + number;
}
else if( operator.equals("-") ) {
answer = answer - number;
}
else if( operator.equals("*") ) {
answer = answer * number;
}
else if( operator.equals("/") ) {
answer = answer / number;
}
// display the answer
System.out.println("That gives: " + answer );
System.out.println();
// increment loop counter
loopCounter = loopCounter + 1;
}//end while( loopCounter...
// Leave a blank line before the answer
System.out.println();
// Now check the answer
if( answer == 24) {
// answer was correct
System.out.println("Well done, genius! \n");
}
else {
// Answer was not correct
System.out.println("Better luck next time. \n");
}
System.out.println("Goodbye, thanks for playing. \n");
}//end mainLoop()
}//end class MagicNumber
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