Approximation value of pi is 3.466667.

write some code, and then ask us for help when u get stuck. read the sI don't know what I am missing or what esle to do.ticky about homework.

you need to display pi when it has been approximated:

cout << "approximate value of pi is"<<pi<<endl;
and pi =4x(1-1/3+1/5-1/7-+1/9-1/11+1/13/...); will not work becuase the compiler can not calculate the ... so to coninue you would need some sort of looped structure. Then when it has done that, all you have to do is multiply by 4.

heres an example of how i would do it:

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#include <iostream.h>
#include <math.h>
int main()
{
	 double pi = 0; // Calculating pi/4
	 int elements = 2000;
	 for (long int n = 1; n <= elements; n++)
	 {
		 pi += (double) pow(-1, n+1)/(2*n-1);
	 } 
// Calculating pi
pi *= 4;
cout << "Estimated PI value (" << elements << " elements): "<< pi;
return 0;
}

#include <iostream.h> #include <math.h> int main() { double pi = 0; // Calculating pi/4 int elements = 2000; for (long int n = 1; n <= elements; n++) { pi += (double) pow(-1, n+1)/(2*n-1); } // Calculating pi pi *= 4; cout << "Estimated PI value (" << elements << " elements): "<< pi; return 0; }

As you can see I left some work in there for you, but it up to you to find out how the program works and what you need to modify to allow the user to determin the number of cycles.

usingnamespace std; use that with <iostream> and it should work.