I'm trying to use math.sin(x) for sin but it not work correctly

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A o a!
I'm trying to creat a calculator using java swing componants that have sin, cos and tan functions and also inverse of these functions. I'm using Math.sin(x); function and like this others. Here is a problem in my code these six functions not work correctly but other functions work correctly like sinh, cosh and tanh and some others. Below I past the code that's I write in my program. Kindly if anyone understand please tell me where I'm wrong.

What I have tried:

Java

private void cosActionPerformed(java.awt.event.ActionEvent evt) {                                    
        num = Double.parseDouble(jTextField1.getText()) ;
        jLabel1.setText("Cos "+num);
        ans = Math.cos(num);
        jTextField1.setText(Double.toString(ans));
    }

Posted 21-Mar-21 21:36pm

Mehboob Shaukat

Updated 21-Mar-21 22:31pm

CPallini

v2

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Comments

CPallini 22-Mar-21 3:40am

Hello, you should report also the:
- input
- output
- expected output
in order to get help.

Patrice T 22-Mar-21 3:42am

'Here is a problem in my code these six functions not work correctly'
Be more specific.
What input, actual output and expected output, on what code ?

Mehboob Shaukat 22-Mar-21 3:49am

Hello Dear
Here is whole code.

public class Testclass extends javax.swing.JFrame {

/**
* Creates new form Testclass
*/

double num,ans;

public Testclass() {
initComponents();
}

/**
* This method is called from within the constructor to initialize the form.
* WARNING: Do NOT modify this code. The content of this method is always
* regenerated by the Form Editor.
*/
@SuppressWarnings("unchecked")
// <editor-fold defaultstate="collapsed" desc="Generated Code">
private void initComponents() {

jLabel1 = new javax.swing.JLabel();
jTextField1 = new javax.swing.JTextField();
sin = new javax.swing.JButton();
cos = new javax.swing.JButton();
tan = new javax.swing.JButton();

setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);

sin.setText("Sin");
sin.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
sinActionPerformed(evt);
}
});

cos.setText("Cos");
cos.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
cosActionPerformed(evt);
}
});

tan.setText("Tan");
tan.addActionListener(new java.awt.event.ActionListener() {
public void actionPerformed(java.awt.event.ActionEvent evt) {
tanActionPerformed(evt);
}
});

javax.swing.GroupLayout layout = new javax.swing.GroupLayout(getContentPane());
getContentPane().setLayout(layout);
layout.setHorizontalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(javax.swing.GroupLayout.Alignment.TRAILING, layout.createSequentialGroup()
.addContainerGap()
.addGroup(layout.createParallelGroup(javax.swing.GroupLayout.Alignment.TRAILING)
.addComponent(sin, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(jTextField1)
.addComponent(jLabel1, javax.swing.GroupLayout.DEFAULT_SIZE, javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE)
.addComponent(cos, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE)
.addComponent(tan, javax.swing.GroupLayout.DEFAULT_SIZE, 380, Short.MAX_VALUE))
.addContainerGap())
);
layout.setVerticalGroup(
layout.createParallelGroup(javax.swing.GroupLayout.Alignment.LEADING)
.addGroup(layout.createSequentialGroup()
.addContainerGap()
.addComponent(jLabel1, javax.swing.GroupLayout.PREFERRED_SIZE, 39, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(jTextField1, javax.swing.GroupLayout.PREFERRED_SIZE, 36, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(sin, javax.swing.GroupLayout.PREFERRED_SIZE, 55, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(cos, javax.swing.GroupLayout.PREFERRED_SIZE, 55, javax.swing.GroupLayout.PREFERRED_SIZE)
.addPreferredGap(javax.swing.LayoutStyle.ComponentPlacement.UNRELATED)
.addComponent(tan, javax.swing.GroupLayout.PREFERRED_SIZE, 55, javax.swing.GroupLayout.PREFERRED_SIZE)
.addContainerGap(javax.swing.GroupLayout.DEFAULT_SIZE, Short.MAX_VALUE))
);

Mehboob Shaukat 22-Mar-21 3:51am

Kindly read this and tell me where I'm wrong. I'm very thankful to you.

Patrice T 22-Mar-21 4:13am

Use Improve question to update your question.
So that everyone can pay attention to this information.

What input, actual output and expected output ?

Mehboob Shaukat 22-Mar-21 4:22am

In my code I enter 1 using sin function it gives answer 0.8414709848078965 while original value is 0.017452 and when I enter 1 using cos function it returns me 0.540302 while original value is 0.999848 and same like this others

2 solutions

Solution 1

Quote:
In my code I enter 1 using sin function it gives answer 0.8414709848078965 while original value is 0.017452 and when I enter 1 using cos function it returns me 0.540302 while original value is 0.999848 and same like this others

The problem is your expectation !
You expect sin to work in degree, but it works in radian.
Read documentation.

Posted 21-Mar-21 22:30pm

Patrice T

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OriginalGriff · Accepted Answer · 2021-03-21T22:31:00

Solution 2

It's probably because you are providing degrees, and math.cos expects radians.

cos(1) radian is 0.54030230586
cos(1) degree is 0.99984769515

To convert from degrees to radians, just multiply the degrees by π/180.

Posted 21-Mar-21 22:31pm

OriginalGriff

Comments

Mehboob Shaukat 22-Mar-21 4:33am

I'm very very thankful to you sir.
Very very thank you sir

OriginalGriff 22-Mar-21 5:20am

You're welcome!