geometric sequence

[HighlightReel44]

How i do write a funtion ((IsGeometric)) with variable number of arguments that takes an integer first argument followed by any number of arguments of type ((double)) and returns ((true)) uf the argument of type ((double)) forms a geometric sequence and ((false)) if they don't

Need question in 4 days

Thanks. I woudl really appreciate a response in the next 4 days

[whodgson]

hmm....well, assuming you are aware of the properties of a geometric sequence
your isGeometric(int ,double,double. .......double) function has only to determine whether if each term (except the first) increases or reduces by the square of its ratio. For example: a , ar, ar^2, ar^3, ar^4 ..........ar^(n-1) is a geometric sequence where ratio 'r' is being raised by increasing powers. If this is true your function should return 'true' or 1 otherwise 'false' or 0. You could do this by examining the successive powers of r or summing the first ? terms and comparing that value with what it should be using the sum formula.which is a(1-r^n)/1-r (assert r!==1). You would of course need a main () driver function to test the function as well as the appropriate #include <header> files.If you post some code there are plenty of people here to help you get it right.

[newb16]

Start with any tutorial function about va_arg. And when examining doubles for equality thing about some precision because they might not be equal because of rounding.

[HighlightReel44]

ok i'm still a little confused could u give me an example source code of how it should look

[jkmyoung]

Take the first 2 elements,
Set ratio = element 2 / element 1.

loop through double array
if an element * ratio doesn't = the next element, return false.
end loop

return true.

Be careful of rounding, and dividing by zero.

[whodgson]

Couldn`t improve on the above method set out by jkmyoung. It`s time for you to convert this into code.