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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. double f(double x) {
  5.     return x * x * x - 2 * x - 5;
  6. }
  7.  
  8. void secant_method(double x0, double x1, double tol, int max_iter) {
  9.     double x_next, fx0, fx1;
  10.     int iter = 0;
  11.  
  12.     printf("Iteration\t x0\t\t x1\t\t x_next\t\t f(x_next)\n");
  13.  
  14.     do {
  15.         fx0 = f(x0);
  16.         fx1 = f(x1);
  17.  
  18.         if (fx1 - fx0 == 0) {
  19.             printf("Mathematical Error! Division by zero occurred.\n");
  20.             return;
  21.         }
  22.  
  23.         x_next = x1 - (fx1 * (x1 - x0)) / (fx1 - fx0);
  24.  
  25.         printf("%d\t\t %lf\t %lf\t %lf\t %lf\n", iter + 1, x0, x1, x_next, f(x_next));
  26.  
  27.         x0 = x1;
  28.         x1 = x_next;
  29.         iter++;
  30.  
  31.     } while (fabs(f(x_next)) > tol && iter < max_iter);
  32.  
  33.     if (iter == max_iter) {
  34.         printf("\nMethod did not converge within %d iterations.\n", max_iter);
  35.     } else {
  36.         printf("\nThe root of the equation is: %lf\n", x_next);
  37.     }
  38. }
  39.  
  40. int main() {
  41.     double x0, x1, tol;
  42.     int max_iter;
  43.  
  44.     printf("Enter two initial guesses (x0 and x1): ");
  45.     scanf("%lf %lf", &x0, &x1);
  46.  
  47.     printf("Enter the desired tolerance: ");
  48.     scanf("%lf", &tol);
  49.  
  50.     printf("Enter the maximum number of iterations: ");
  51.     scanf("%d", &max_iter);
  52.  
  53.     secant_method(x0, x1, tol, max_iter);
  54.  
  55.     return 0;
  56. }
Success #stdin #stdout 0.01s 5292KB
comments (?)
stdin 
Standard input is empty
stdout 
Enter two initial guesses (x0 and x1): Enter the desired tolerance: Enter the maximum number of iterations: Iteration	 x0		 x1		 x_next		 f(x_next)
Mathematical Error! Division by zero occurred.
https://ideone.com/U0sQx7
language:
C (clang 8.0)
created:
2 days ago
visibility:
public

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