Unit 1.5 Secant Method

#include <stdio.h>
#include <math.h>
#define f(x) ((x * x * x) - (9*x) + 1)
int main()
{
    float x0,x1,x2,xm,c,E;
    int i = 0;
    printf("Enter the initial values\n");
    scanf("%f %f %f",&x0,&x1,&E);

    if (f(x0) * f(x1) > 0){
        printf("Can not find a root in the given interval");
        return 0;
    }

    do
    {
        x2 = (x0 * f(x1) - x1 * f(x0)) / (f(x1) - f(x0));
        c = f(x0) * f(x2);

        x0 = x1;
        x1 = x2;

        i++;

        if (c == 0) break;
        xm = (x0 * f(x1) - x1 * f(x0)) / (f(x1) - f(x0));
    } while (fabs(xm - x2) >= E);

    printf("Root of the given equation= %f\n", x2);
    printf("No. of iterations = %d\n", i);

    return 0;
}

/*
Output
Enter the initial values
2 3 0.001
Root of the given equation= 2.942849
No. of iterations = 3
*/