Untitled

#include<stdio.h>
#include<math.h>
#include<stdlib.h>
#define f(x) x*x*x-2*x-5
int main()
{
        float x0,x1,x2,f0,f1,f2,e;
            int step=1,N;
                printf("\nEnter initial guesses:\n");
                    scanf("%f%f", &x0, &x1);
                        printf("Enter tolerable error:\n");
                            scanf("%f", &e);
                                printf("Enter maximum iteration:\n");
                                    scanf("%d", &N); /* Implementing Secant Method */
                                        printf("\nStep\t\tx0\t\tx1\t\tx2\t\tf(x2)\n");
                                            do
                                                {
                                                            f0 = f(x0); f1 = f(x1);
                                                                    if(f0 == f1)
                                                                            {
                                                                                            printf("Mathematical Error.");
                                                                                                        exit(0);
                                                                            }
                                                                                    x2 = x1 - (x1 - x0) * f1/(f1-f0);
                                                                                            f2 = f(x2);
                                                                                                    printf("%d\t\t%f\t%f\t%f\t%f\n", step, x0, x1, x2, f2);
                                                                                                            x0 = x1; f0 = f1; x1 = x2; f1 = f2;
                                                                                                                    step = step + 1;
                                                                                                                            if(step > N)
                                                                                                                                    {
                                                                                                                                                    printf("Not Convergent.");
                                                                                                                                                                exit(0);
                                                                                                                                    }
                                                }
                                                    while(fabs(f2)>e);
                                                        printf("\nRoot is: %f", x2);
                                                            getch();
}
                                                                                                                                    }
                                                                            }
                                                }
}