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DstSoldier

Wed Mar 19, 2008 6:32 pm


Any Help Appreciated

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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

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


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Saad

Wed Mar 19, 2008 6:40 pm


Re: Any Help Appreciated

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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


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DstSoldier

Wed Mar 19, 2008 6:51 pm


Re: Any Help Appreciated

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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.


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Saad

Wed Mar 19, 2008 6:53 pm


RE:Any Help Appreciated

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

Taken out of the Turing walkthrough found [url=http://compsci.ca/v3/viewtopic.php?t=8808]Here


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DstSoldier

Wed Mar 19, 2008 7:11 pm


Re: Any Help Appreciated

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/* 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?


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Saad

Wed Mar 19, 2008 7:12 pm


Re: Any Help Appreciated

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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 ;)


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DstSoldier

Wed Mar 19, 2008 7:32 pm


Re: Any Help Appreciated

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/* 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.