C program for Bisection Method

This is program written in c to find the root of equation using bisection method. You can find root of any equation, just you have to do i...

This is program written in c to find the root of equation using bisection method.
You can find root of any equation, just you have to do is change the equation to other equation of which you want to find on the code...... Have Fun!!!


#include<conio.h>
#include<stdio.h>
#include<math.h>
#define f(x) x*x-4*x-10
#define e 0.0001
void main()
{
float x0,x1,x2,f0,f1,f2,root;
int i=1;
clrscr();
printf("Using Bisection Method to find root of equation X^2-4x-10\n");
printf("Enter value for x1 and x2\n");
a:printf("x1: ");
scanf("%f",&x1);
printf("x2: ");
scanf("%f",&x2);
f1=f(x1);
f2=f(x2);
if((f1*f2)>0)
{
printf("Enter another gueses\n");
goto a;
}
else
{
   printf("\t\tx0\tf0\tx1\tf1\tx2\tf2\n");

 b: x0=(x1+x2)/2;
f0=f(x0);
printf("\nItteration: %d\t%.4f\t%.4f\t%.4f\t%.4f\t%.4f\t%.4f",i,x0,f0,x1,f1,x2,f2);
}
if((f1*f0)<0)
{
x2=x0;
f2=f0;
}
else
{
x1=x0;
f1=f0;
}
if(fabs((x2-x1)/x2)<=e)
{
root=(x1+x2)/2;
printf("\nThe root is %.4f",root);
goto c;
}
else
{       i++;
goto b;
}
c:

getch();
}

Output