I have a java question in my computer class, but it makes no sense.

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"Write a Java program named <<yourname>>Assign5 that generate PI to a user defined decimal places (No rounding).
Make sure you use Math.PI (PI is estimated as: 3.141592653589793)
If the user select to choose 5 decimal places the output should be: 3.14159 not 3.14160
Also
If the user select to choose 4 decimal places the output should be: 3.1415 not 3.1416"
I have no idea how to do this!

What I have tried:

I don't know where to start. We never learned this in class so it makes no sense to me.

Posted 12-Nov-17 9:40am

Member 13517170

Updated 12-Nov-17 10:01am

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CPallini · Answer 1 · 2017-11-12T10:01:00

Quote:
I don't know where to start. We never learned this in class so it makes no sense to me.

It actually makes sense.
A possible algorithm is described by the following example:
Suppose you're asked to provide two decimal digits.
Starting from

pi = 3.141592653589793

take just the integer part, namely 3
then multiply the remaining number by 10, obtaining

1.41592653589793

take the integer part, namely 1
make another step

4.1592653589793

obtaining 4.
The result is

3.14