bakerule22
asked on
Java How to Program Exercise Question
I been trying figure out this question but i can't figure it out I need help asap!!
Write an applet that asks the user to enter two floating point numbers, obtains the two numbers from the user and draws their sum, product (Multiplication), difference and quotient (division).
So far I got
Write an applet that asks the user to enter two floating point numbers, obtains the two numbers from the user and draws their sum, product (Multiplication), difference and quotient (division).
So far I got
//Fig. 23.9: AdditionApplet.java
// Applet that adds two doubl values entered via input dialogs.
import java.awt.Graphics; // program uses class Graphics
import javax.swing.JApplet; // program uses class JApplet
import javax.swing.jOptionPane; // program uses class jOptionPane
public class AdditionApplet extends JApplet
{
private doulb sum; // sum of values entered by user
// initialize applet by obtaining values from user
public void init()
{
// obtain first number from user
String firstNumber = JOptionPane.showInputDialog(
"Enter first floating-point value" );
// obtain second number from user
String secondNumber = JOptionPane.showInputDialog(
"Enter second floating-point value" );
// convert numbers from type String to type double
double number1 = Double.parseDouble( firstNumber );
double number2 = Double.parseDouble( secondNumber );
sum = number1 + number2; // add numbers
} // end method init
// draw results in a rectangle on applet's background
public void paint( Graphics g )
{
super.paint( g ); // call superclass version of method pain
// draw rectangle starting from (11, 10) that is 270
// pixels wide and 20 pixels tall
g.drawRect( 15, 10, 270, 20 );
// draw results as a String at (25, 25)
g.drawString( "The sum is " + sum, 25, 25 );
} // end method paint
} // end class AdditionApplet
I think you should just change doulb to double and jOptionPane to JOptionPane
And it makes a sum for me just after these two corrections
import javax.swing.jOptionPane; -->import javax.swing.JOptionPane;
private doulb sum; ---> private double sum;
ASKER
ok
ASKER
// Fig. 23.9: AdditionApplet.java
// Applet that adds two double values entered via input dialogs.
import java.awt.Graphics; // program uses class Graphics
import javax.swing.JApplet; // program uses class JApplet
import javax.swing.JOptionPane; // program uses class JOptionPane
public class AdditionApplet extends JApplet
{
private double sum; // sum of values entered by user
// initialize applet by obtaining values from user
public void init()
{
// obtain first number from user
String firstNumber = JOptionPane.showInputDialog(
"Enter first floating-point value" );
// obtain second number from user
String secondNumber = JOptionPane.showInputDialog(
"Enter second floating-point value" );
// convert numbers from type String to type double
double number1 = Double.parseDouble( firstNumber );
double number2 = Double.parseDouble( secondNumber );
sum = number1 + number2; // add numbers
} // end method init
// draw results in a rectangle on applet's background
public void paint( Graphics g )
{
super.paint( g ); // call superclass version of method pain
// draw rectangle starting from (11, 10) that is 270
// pixels wide and 20 pixels tall
g.drawRect( 15, 10, 270, 20 );
// draw results as a String at (25, 25)
g.drawString( "The sum is " + sum, 25, 25 );
} // end method paint
} // end class AdditionApplet
I fix it
Replace
sum = number1 + number2;
also add declaration
private double result;
immediately after the sum declasruion
and also change sum to result in the paint(g) method
and you'll get any operrtaion nit just sum
String operator = JOptionPane.showInputDialog(
"Enter operator (+,-,*,/):");
if(operator.equals("+")){
result = number1 + number2;
} else if
(operator.equals("-")){
result = number1 - number2;
} else if
(operator.equals("*")){
result = number1 * number2;
} else
if(operator.equals("/")){
result = number1 / number2;
}
So your code in ID:36936817 should be working for addition as it worked for me
Look into my previous posting if you want to add other operations
Look into my previous posting if you want to add other operations
ASKER CERTIFIED SOLUTION
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ASKER
ok thanks
ASKER
I just want check one more time if this what look likes
// Fig. 23.9: AdditionApplet.java
// Applet that adds two double values entered via input dialogs.
import java.awt.Graphics; // program uses class Graphics
import javax.swing.JApplet; // program uses class JApplet
import javax.swing.JOptionPane; // program uses class JOptionPane
public class AdditionApplet extends JApplet
{
private double sum; // sum of values entered by user
// initialize applet by obtaining values from user
public void init()
{
// obtain first number from user
String firstNumber = JOptionPane.showInputDialog(
"Enter first floating-point value" );
// obtain second number from user
String secondNumber = JOptionPane.showInputDialog(
"Enter second floating-point value" );
// convert numbers from type String to type double
double number1 = Double.parseDouble( firstNumber );
double number2 = Double.parseDouble( secondNumber );
String operator = JOptionPane.showInputDialog(
"Enter operator (+,-,*,/):");
if(operator.equals("+")){
result = number1 + number2;
} else if
(operator.equals("-")){
result = number1 - number2;
} else if
(operator.equals("*")){
result = number1 * number2;
} else
if(operator.equals("/")){
result = number1 / number2;
}
} // end method init
// draw results in a rectangle on applet's background
public void paint( Graphics g )
{
super.paint( g ); // call superclass version of method pain
// draw rectangle starting from (11, 10) that is 270
// pixels wide and 20 pixels tall
g.drawRect( 15, 10, 270, 20 );
// draw results as a String at (25, 25)
g.drawString( "The sum is " + sum, 25, 25 );
} // end method paint
} // end class AdditionApplet
You should add (or even replace)
private double sum;
with
private double result;
and replace:
g.drawString( "The sum is " + sum, 25, 25 );
with
g.drawString( "The result is " + result, 25, 25 );
The rest I think should be OK.
This works:
Hope you are studying Java all by yourselef, not in a class so that we are not violating EE rules
private double sum;
with
private double result;
and replace:
g.drawString( "The sum is " + sum, 25, 25 );
with
g.drawString( "The result is " + result, 25, 25 );
The rest I think should be OK.
This works:
// Fig. 23.9: AdditionApplet.java
// Applet that adds two double values entered via input dialogs.
import java.awt.Graphics; // program uses class Graphics
import javax.swing.JApplet; // program uses class JApplet
import javax.swing.JOptionPane; // program uses class JOptionPane
public class AdditionApplet extends JApplet
{
private double result; // sum of values entered by user
// initialize applet by obtaining values from user
public void init()
{
// obtain first number from user
String firstNumber = JOptionPane.showInputDialog(
"Enter first floating-point value" );
// obtain second number from user
String secondNumber = JOptionPane.showInputDialog(
"Enter second floating-point value" );
// convert numbers from type String to type double
double number1 = Double.parseDouble( firstNumber );
double number2 = Double.parseDouble( secondNumber );
String operator = JOptionPane.showInputDialog(
"Enter operator (+,-,*,/):");
if(operator.equals("+")){
result = number1 + number2;
} else if
(operator.equals("-")){
result = number1 - number2;
} else if
(operator.equals("*")){
result = number1 * number2;
} else
if(operator.equals("/")){
result = number1 / number2;
}
} // end method init
// draw results in a rectangle on applet's background
public void paint( Graphics g )
{
super.paint( g ); // call superclass version of method pain
// draw rectangle starting from (11, 10) that is 270
// pixels wide and 20 pixels tall
g.drawRect( 15, 10, 270, 20 );
// draw results as a String at (25, 25)
g.drawString( "The result is " + result, 25, 25 );
} // end method paint
} // end class AdditionApplet
Hope you are studying Java all by yourselef, not in a class so that we are not violating EE rules
ASKER
ok thanks for help