Unit 1.4 Regula Falsi Method

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

#define f(x) ((x*x*x) - (9*x) + 1)
int main()
{
    float x0,x1,e,x2,y0,y1,y2;
    int i=0;
    printf("Enter the value of x0,x1,e\n");
    scanf("%f %f %f",&x0,&x1,&e);
    y0 = f(x0);
    y1 = f(x1);
    if(y1*y0>0){
        printf("\nIntial values are not correct");
        return 0;
    }
    do{
        x2=(x0*y1-x1*y0)/(y1-y0);
        y2=f(x2);
        i++;

        if(y2*y0>0){
            x0 = x2;
            y0 = y2;
        }
        else{
            x1 = x2;
            y1 = y2;
        }
        printf("\nx%d = %f",i,x2);
    }while(fabs(y2)>e);
    printf("\nHence the root is %f",x2);
    printf("\nTotal number of interations are %d",i);
    return 0;
}

/*
Output
Enter the value of x0,x1,e
2 3
0.001
x1 = 2.900000
x2 = 2.941555
x3 = 2.942783
Hence the root is 2.942783
Total number of interations are 3
*/