Square Root of a number by using simple calculations.

#include<stdio.h>
#include<conio.h>
main()
{
float a,b,e=0.00001,p,k;
clrscr();
textcolor(GREEN);
do
{
printf(" ***********************************");
printf(" PROGRAM TO FIND SQUARE ROOT OF A NUMBER");
printf(" ***********************************");
cprintf("ENTER A NUMBER(-1 to Quit) :");
scanf("%f",&k);

a=k;p=a*a;
while(p-k>=e)
{
b=(a+(k/a))/2;
a=b;
p=a*a;
}
printf("SQUARE ROOT IS = %f",a);
getch();
clrscr();
}
while(k!=-1);
getch();
}