import cs1.Keyboard;
/**
   Calculate the sum of numbers from a to b step c.
   @author Greg Vogl
   last modified 2003-09-22
*/
public class Sumabc
{
   /**
      Calculate the sum of numbers from a to b step c.
      <br>input: float a, b, c
      <br>output: sum from a to b step c
      @throws IOException to handle bad input
   */
   public static void main (String[] args) 
   {
      // get input
      System.out.println("This program calculates the sum of numbers from a to b step c.");
      System.out.println("Enter float a and press Enter.");
      float a = Keyboard.readFloat();
      System.out.println("Enter float b and press Enter.");
      float b = Keyboard.readFloat();
      System.out.println("Enter float c and press Enter.");
      float c = Keyboard.readFloat();

      // calculate statistics
      float sum = 0;
      for (float f = a; f <= b; f += c)
         sum += f;

      // output results
      System.out.println(sum + "\tSum");
   }
}