Using for loop create a bluej program for the question(https://1drv.ms/u/s! Ajrld_fzlfykhx8hc1sbkiufuc_p)

Question

1.00/5 (1 vote)

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The question is this-:
Write a program using for loop that computes sinx and cosx by using the following power series-
sinx=x-x^3/3!+x^5/5!-x^7/7!+....
cosx=1-x^2/2!+x^4/4!-x^6/6!+.....

Note-(Here ! is used for factorial of that number and ^ for to the power)
.

What I have tried:

class sincos
{
void main(double x,int n)
{
int i,j,k,f;
double sum=0.0;
x=Math.toRadians(x);
{
for(i=1,j=1;i<=n;i=i+2,j++)
{
f=1;
for(k=1;k<=i;k++)
{
f=f*i;
}

if(j%2==0)
sum=sum-(Math.pow(x,i)/f);
else
sum=sum+(Math.pow(x,i)/f);
}
System.out.println("sin"+Math.toDegrees(x)+"="+sum);
}

for(i=0,j=1;i<=n;i=i+2,j++)
{
f=1;
for(k=1;k<=i;k++)
{
f=f*i;
}

if(j%2==0)
sum=sum-(Math.pow(x,i)/f);
else
sum=sum+(Math.pow(x,i)/f);
}
System.out.println("cos"+Math.toDegrees(x)+"="+sum);
}}

Posted 26-Oct-20 19:04pm

User 14941421

Updated 27-Oct-20 5:21am

v2

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Richard Deeming 27-Oct-20 4:14am

REPOST
You have already posted this in the Java forum:
Using for loop create a bluej program for the question( https://1drv.ms/u/s! Ajrld_fzlfykhx8hc1sbkiufuc_p ) - Java Discussion Boards[^]

An unexplained, unformatted code-dump and a link to download your entire project is still not a question.

Richard MacCutchan 27-Oct-20 11:26am

I thought we voted this one off once already.

[no name] 27-Oct-20 11:32am

Can you solve this question-: YES or NO say once
The question is this-:
Write a program using for loop that computes sinx and cosx by using the following power series-
sinx=x-x^3/3!+x^5/5!-x^7/7!+....
cosx=1-x^2/2!+x^4/4!-x^6/6!+.....

Note-(Here ! is used for factorial of that number and ^ for to the power)

Richard MacCutchan 27-Oct-20 11:38am

Yes, "Write a program", which is an instruction for you to write the program detailed in this assignment. So what exactly do you want from us?

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OriginalGriff · Accepted Answer · 2020-10-26T21:05:00

Compiling does not mean your code is right! :laugh:
Think of the development process as writing an email: compiling successfully means that you wrote the email in the right language - English, rather than German for example - not that the email contained the message you wanted to send.

So now you enter the second stage of development (in reality it's the fourth or fifth, but you'll come to the earlier stages later): Testing and Debugging.

Start by looking at what it does do, and how that differs from what you wanted. This is important, because it give you information as to why it's doing it. For example, if a program is intended to let the user enter a number and it doubles it and prints the answer, then if the input / output was like this:

Input   Expected output    Actual output
  1            2                 1
  2            4                 4
  3            6                 9
  4            8                16

Then it's fairly obvious that the problem is with the bit which doubles it - it's not adding itself to itself, or multiplying it by 2, it's multiplying it by itself and returning the square of the input.
So with that, you can look at the code and it's obvious that it's somewhere here:

C#

int Double(int value)
   {
   return value * value;
   }

Once you have an idea what might be going wrong, start using the debugger to find out why. Put a breakpoint on the first line of the method, and run your app. When it reaches the breakpoint, the debugger will stop, and hand control over to you. You can now run your code line-by-line (called "single stepping") and look at (or even change) variable contents as necessary (heck, you can even change the code and try again if you need to).
Think about what each line in the code should do before you execute it, and compare that to what it actually did when you use the "Step over" button to execute each line in turn. Did it do what you expect? If so, move on to the next line.
If not, why not? How does it differ?
Hopefully, that should help you locate which part of that code has a problem, and what the problem is.
This is a skill, and it's one which is well worth developing as it helps you in the real world as well as in development. And like all skills, it only improves by use!