can someone tell what is this question want actually?

[zewl]

The following series summation is an approximation for computing the natural logarithm of a floatingpoint
value x:

logx=[(x-1)]–[[(x-1)^2]/2]+[[(x-1)^3]/3]–[[(x-1)^4]/4]+….+(-1)n+1(x-1)^n/n

Where 2 >= x > 0 and n is a positive integer.
Design and implement an interactive program that does the following:
1. Prompts the user to enter a floating-point value for x and reads it.
2. Ensures that x is in the proper range; if not, re prompts the user to enter another value.

[zewl]

i need to know how to start.

[whodgson]

1.
It wants you to write a "prompt" like "Enter a floating point number" and it also wants the "cin>> ? " code to allow the user to input the floating point number.
2.
It wants code included which will reject a value for x which does not conform with the pre-invariant of 2>x>0. (x must be less than 2 and greater than 0)
i.e if as a result of cin>>x; x evaluated to 2.36 a message would be printed such as "x too big" and return the user to the loop start to enter a valid input which respected the pre-invariant..

[Banfa]

Stangely, as you can get by implication from whodgsons reply it gives the details of a power series but never asks you to put it into code. It almost looks like you have 1/2 the question.

[maiyappan]

read d value for x,n.check wheather if(x>0&&x<=2) then if it true then claculate
d logx in a for loop like given below
if(x>0&&x<=2) {
mul=1;logx=0;
for(i=1;i<=n;i++)
{
mul*=(x-1);
logx+=mul/(float)i;
}}

[zewl]

owh ic.. i'll try to do it.. any problem later i will post..
thx...
>.<