Thread: The "For" loop

I have a homework assignment where I'm supposed to calculate the values for theta when given the value of pi and I'm sure I have to use the "for" loop however I don't know how the code for this would work.

Here is what I have so far:

Code:

double theta (int limit);
const double pi = 3.141592653589793;

int main (void)
{
   //Local Declaration
   int limit;

   //Statements
   printf("pi = %lf\n", pi);
   limit=5;
   printf ("\nNumber of terms = %d\nTheta = %lf\nDifference between theta and pi = %lf\n\n",
   limit, theta(limit), theta(limit) - pi);
   limit=10;
   printf ("\nNumber of terms = %d\nTheta = %lf\nDifference between theta and pi = %lf\n\n",
   limit, theta(limit), theta(limit) - pi);

Here's the problem if it helps:

In this problem you will build a main function, that acts as a test driver for your theta (Θ) function.
In the figure in the book for problem 50, theta (Θ) is used for the approximation of pi (Π).

Make the return type from the theta function a double, the value of theta.
Make the parameter of the theta function an int, the number of terms to be used in the approximation.

Call the theta function from main two times.
The first time, pass the integer 5 to request 5 terms in the approximation.
The second time, pass the integer 10 to request 10 terms in the approximation.
In the main function print a neat listing of the results.
First print the value of pi (which is approximatly 3.141592653589793),
Then print the following for each of the two passes:

* The number of terms
* The values calculated for theta
* The difference between the values of theta and pi

Another thing, when I run what I have so far into the compiler, an error comes up saying that my printf statement is undefined. I think this is an error with my compiler, but I'm not positive. If anyone could verify this for me it would be greatly appreciated. Using Bloodshed Dev C++

Originally Posted by PaperBag

Code:

   printf ("\nNumber of terms = %d\nTheta = %lf\nDifference between theta and pi = %lf\n\n",
   limit, theta(limit), theta(limit) - pi);


   printf ("\nNumber of terms = %d\nTheta = %lf\nDifference between theta and pi = %lf\n\n",
   limit, theta(limit), theta(limit) - pi);

for your printf statements, unlike with some functions, you can't separate it into multiple lines, and that's probably what your compiler is complaining about.

try it like this:

Code:

/*your first printf*/
 printf ("\nNumber of terms = %d \n",limit);

 printf ("Theta = %lf\n",theta(limit));

printf ("Difference between theta and pi = %lf \n\n",theta(limit) - pi);

/*this also makes it more readable*/

this is all assuming what you're putting in for your %?'s are correctly done. hope i could help =P

Oh wow... sorry about that guys. I'm rather new at this as Quzah indirectly pointed out

Does anyone still know how this "for" loop is supposed to look? I'm reading the lessons on this site right now, but unfortunately I'm still confused.

Didn't you read quzah's post?