/*Newton - Raphson method for calculating square roots*/
/*First sq rt program by Rajesh*/

#include <stdio.h>
#include <conio.h>
#define EPSILON 0.0001

main()
{
 float n,guess;
 clrscr();
 printf("\n\nThis program will calculate the square root of given number\n************************************************************\n Enter zero to terminate the application");
 printf("\n\n\nPlease enter a number whose root is to be found:");
 scanf("%f",&n);

 while(n)
 {
  while(n<0||n>1000)
   {
    printf("\nPlease enter a non zero number within 1000!");
    printf("\n So what is the new number:");
    scanf("%f",&n);
   }

  for(
     guess=n/2.0;
     guess * guess - n > EPSILON||guess * guess - n < -EPSILON;
     guess =(guess + n/guess)/2.0
    );
  printf("\nThe square root of %f is %f.",n,guess);
  printf("\n\nEnter a new number whose square root is to be calculated:");
  scanf("%f",&n);
 }
 printf("\n\nThank you for using my program\n\n\n\n             ---Rajesh");
 getch();
}