Impliment bisection method using itration

Subject: Computation Techniques.
Practical Name: Code for finding the solution of Equation using bisection Method.

 Source Code:
#include<stdio.h>
    #include<conio.h>
    #include<math.h>

    float f(float x)
    {
        return((x*x*x)-(5*x)+1);
    }
    void main()
    {
        float x1,x2,x3,y1,y2,y3;
        int i,n;
        clrscr();
        printf(" enter initial values and no. of iteration");
        scanf("%f%f%d",&x1,&x2,&n);
        y1=f(x1);
        y2=(x2);
        while ((y1*y2)>0)
        {
            printf("enter the initial values and no. of iteration");
            scanf("%f%f%d",&x1,&x2,&n);
            y1=f(x1);
            y2=f(x2);
        }
        for (i=1;i<=n;i++)
        {
            x3=(x1+x2)/2;
            y3=f(x3);
            if((y1*y3)>0)
            {
                x1=x3;
                y1=y3;
            }
            else
            {
                x2=x3;
                y2=y3;
            }
        }
        printf("the root is ...%f",x3);
        getch();
    }
   
/* output */

enter initial values and no. of iteration
2
4                                                                              
4                                                                              
the root is ...2.125000