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  1. #include <stdio.h>
  2. #include <math.h>
  3.  
  4. double newton_method_cubic(double x0, int max_iter, double tol) {
  5.     double x = x0;
  6.     for (int i = 0; i < max_iter; i++) {
  7.         double fx = x * x * x - 7;
  8.         double dfx = 3 * x * x;
  9.         double x_next = x - fx / dfx;
  10.         if (fabs(x_next - x) < tol) {
  11.             return x_next;
  12.         }
  13.         x = x_next;
  14.     }
  15.     return x;
  16. }
  17.  
  18. int main() {
  19.     double initial_guess = 2.0; // 初期値
  20.     int max_iterations = 100; // 最大反復回数
  21.     double tolerance = 1e-7; // 許容誤差
  22.  
  23.     double root = newton_method_cubic(initial_guess, max_iterations, tolerance);
  24.     printf("∛7 ≈ %.10f\n", root);
  25.  
  26.     return 0;
  27. }
Success #stdin #stdout 0s 5284KB
comments (?)
stdin 
Standard input is empty
stdout 
∛7 ≈ 1.9129311828
https://ideone.com/bAmadb
language:
C (gcc 8.3)
created:
11 days ago
visibility:
public

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