maths puissance en java.

Bonjour tout le monde

Je veux faire le calul un plynome.

Je n'obtiens aucun résultat.
Code:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 class Fonction { public double calculpolynome(float ax, float ay, float az, float expo){ float resu = 0; float tp; int i; resu = Math.pow(ax, expo) + 2 * Math.pow(ay, expo-1) + 3 * az; return resu; } }
Faut il faire un import.

Dois modifier le code?

A +

A priori non tu n'as pas besoin d'import speciaux.
Si c'etait le cas tu aurais une erreur de compilation.

Quand tu dis que tu n'obtiens aucun resultat ca signifie quoi exactement ?

Normalement oui cette fonction a l'air correcte (sauf conventions de nommage :sm:)

Bonjour tout le monde

Je crois que le probleme vient de la conversion de chaine en doube, je vous ais mis l'erreur d'execution.

J'ignore la commande pour la conversion de string en double.

Voici la conversion string en double.
Code:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 float a = Float.valueOf(x1.getText()); float b = Float.valueOf(x2.getText()); double e = Float.valueOf(exp.getText()); double ab = Float.valueOf(ax.getText()); double ac = Float.valueOf(ax2.getText()); double ad = Float.valueOf(ax3.getText()); total.setText(Double.toString(intergal.calculpolynome(ab,ac,ad,e)));
Voici le calcul
Code:

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 class Fonction { public double calculpolynome(double ax, double ay, double az, double expo){ double resu = 0; float tp; int i; resu = Math.pow(ax, expo) + 2 * Math.pow(ay, expo-1) + 3 * az; return resu; } }
Voici l'erreur d'execution

Citation:

Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: empty St
ring
at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
at java.lang.Float.valueOf(Unknown Source)
at CompoFonction.actionPerformed(CompoFonction.java:569)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Sour
ce)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)
Exception in thread "AWT-EventQueue-0" java.lang.NumberFormatException: empty St
ring
at sun.misc.FloatingDecimal.readJavaFormatString(Unknown Source)
at java.lang.Float.valueOf(Unknown Source)
at CompoFonction.actionPerformed(CompoFonction.java:569)
at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)
at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)
at javax.swing.DefaultButtonModel.setPressed(Unknown Source)
at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(Unknown Sour
ce)
at java.awt.Component.processMouseEvent(Unknown Source)
at javax.swing.JComponent.processMouseEvent(Unknown Source)
at java.awt.Component.processEvent(Unknown Source)
at java.awt.Container.processEvent(Unknown Source)
at java.awt.Component.dispatchEventImpl(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
at java.awt.Container.dispatchEventImpl(Unknown Source)
at java.awt.Window.dispatchEventImpl(Unknown Source)
at java.awt.Component.dispatchEvent(Unknown Source)
at java.awt.EventQueue.dispatchEvent(Unknown Source)
at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
at java.awt.EventDispatchThread.run(Unknown Source)

A +

Code:

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float a = Float.valueOf(x1.getText());
 
 
float b = Float.valueOf(x2.getText());
 
 
double e = Float.valueOf(exp.getText());
 
double ab = Float.valueOf(ax.getText());
 
 
double ac = Float.valueOf(ax2.getText());
 
double ad = Float.valueOf(ax3.getText());

Une de ces chaines de caracteres est vide, apparement c'est ce qui pose probleme.

Re bonjour

J'ai réglé mon problème

Voici le code

Code:

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if(source==calculer)
{
 
float a;
 
 
float b;
 
 
double ex;
double ab;
 
 
double ac;
 
double ad;
 
 
 
try {
 
a = Float.valueOf(x1.getText());
 
 
b = Float.valueOf(x2.getText());
 
 
ex = Float.valueOf(exp.getText());
 
ab = Float.valueOf(ax.getText());
 
 
ac = Float.valueOf(ax2.getText());
 
ad = Float.valueOf(ax3.getText());
 
 
total.setText(Double.toString(intergal.calculpolynome(ab,ac,ad,ex)));
 
}
catch(NumberFormatException e)
{
 
Toolkit.getDefaultToolkit().beep();
JOptionPane.showMessageDialog(null,"Format entré incorrect.","Erreur de saisie",JOptionPane.ERROR_MESSAGE);
 
 
}
 
 
 
 
 
}

A+