Hi,

I am new to the forums and new to C++ and need some help. I was given an assignment for class to calculate the area of a circle using only the radius as a user input and not using Pi in the code. I need to do this by calculating the areas of a series of rectangles under the curve and adding them together. Using nested loops to continuously reduce the size of these rectangles until the approximated area value is within a margin of error less than 0.1%.

I've spent hours trying to figure out how to get this done and so far this is what ive come up with but I don't know what im doing wrong... If someone could please help me out id greatly appreciate it!

Code:#include<iostream> #include<cmath> using namespace std; int main () { // Initialize double radius, difference, newvalue, oldvalue, area, n(2), i, square; cout << "Enter the radius of the circle...\n"; cout << "Radius: "; cin >> radius; oldvalue=((radius*radius)*3)/2; difference = abs(((newvalue - oldvalue/oldvalue)))*100; // Summon Loop while (difference <= 0.1) { for (i=1; i==n; i++) { square = (radius / n) * (sqrt((radius*radius) - (i*(radius / n)*(i*(radius / n))))); newvalue += square; } // Check Loop difference = abs(((newvalue - oldvalue)/oldvalue))*100; if (difference > 0.1) { oldvalue=newvalue; } n++; } // Result area = 2*newvalue; cout << "\nThe estimated area of the circle is: " << area << endl; system("pause"); return(0); }