/* -------------------------------------------------------------------
   Modular programming

      MAIN (driver) program
   ------------------------------------------------------------------- */

#include <iostream.h>


int main(int argc, char *argv[])
{
   extern float f(float);            // Declare function f

   extern float RectangleRule(float f(float), 
		float, float, int);  // Declare function RectangleRule

   float  a, b, integral;
   int    N;

   cout << "Enter start of interval: ";
   cin >> a;

   cout << "Enter end of interval: ";
   cin >> b;

   cout << "Enter N (number of segments): ";
   cin >> N;

   integral = RectangleRule(f, a, b, N);   // Use RectangleRule !!!

   cout << "Approximate finite integral = " << integral << "\n";

}