Any Help Appreciated

[DstSoldier]

I'm somewhat of an utter noob at turing and there is this one question in my practice questions that I can't seem to grasp.

Question:

"Write a program to find the sum of a number of terms of the infinite series
1+x+x**2+x**3+x**4+..
where the number of terms n to be evaluated and the value of x are input before the summation begins. Experiment with different values of n and x."

%Chapter 4 Exercise 9
%March 19 2008

Quote:

var n:real
var x:real

put "Please enter the number of terms that will be evaluated"
get n
put "Please enter the value of x"
get x

I can't seem to figure out the next thought process required inorder to solve this problem. I remember an attempt where I incorporated count and a few other options and came to a problem where I could not figure out how to add exponents to x that would be calculated in order to find the sum.Unfortunately, I have misplaced that file.

Any help or suggestions welcome.

Thanks

[Saad]

Look up using for loops to go from 1 to n and adding each number to a variable. Futhermore the exponent function is **.
Eg. sum := sum + 2 ** 2 is the same as adding 4 to sum

[DstSoldier]

Saad @ Wed Mar 19, 2008 6:40 pm wrote:

Look up using for loops to go from 1 to n and adding each number to a variable. Futhermore the exponent function is **.
Eg. sum := sum + 2 ** 2 is the same as adding 4 to sum

Yes thanks for the feedback I knew exponents were double **, could you perhaps point me towards the thread or keyward needed in order to find how to use loops going from 1 to n.

[Saad]

This is the place for "for loops" http://compsci.ca/v3/viewtopic.php?t=3678

Taken out of the Turing Walkthrough found Here

[DstSoldier]

Quote:

/* March 17th, 2008

Program designed to use inputted value of x and square it by the

number of terms inputted, obtaining the sum.

CH4EX9*/

var sum, x : real

var no_of_terms : int

put no_of_terms:0

put "Enter number of terms to input."

get no_of_terms

put no_of_terms, " terms are going to be entered."

put ""



put "Enter value of x."

get x

put x, " is the value of X."



for i : 1.. no_of_terms

put "1+x+", i

end for

I read the loops tutorial to reconfirm what I know I can't seem to get the program to run says no variable, any suggestions?

[Saad]

[quote="DstSoldier @ Wed Mar 19, 2008 7:11 pm"]

Quote:

var no_of_terms : int
put no_of_terms:0

no_of_terms was never initialized and as a result has no value. You want to give it a value

[DstSoldier]

Quote:

/* March 17th, 2008

Program designed to use inputted value of x and square it by the

number of terms inputted, obtaining the sum.

CH4EX9*/

var sum, x : real

var no_of_terms : int

put "Enter number of terms to input."

get no_of_terms

cls

put no_of_terms, " terms are going to be entered."

put ""



put "Enter value of x."

get x

put x, " is the value of X."


for i : 1.. no_of_terms

put "1+x+", i

%This is what I want to do before I end the program cant figure out how to to do it.
sum=: i+x**no_of_terms


end for

hmm I seem to have fixed that last problem cant seem to get the sum be equal to i+x to the exponent to the no_of_terms.