C : fixed point iteration method

#include<stdio.h>
#include<conio.h>
#include<math.h>
#include<stdlib.h>

#define E 0.00001
#define g(x) 2-x*x

int main()
{
float x1,x2;

printf("Enter the initial guess : ");
scanf("%f",&x1);

Lbl:
x2=g(x1);
if(((x2-x1)/x2)<E)
{
printf("The root is %f",x2);
goto End;
}
else
   {
x1=x2;
goto Lbl;
}
End:
getch();
return(0);
}