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  1. #include <bits/stdc++.h>
  2. using namespace std;
  3. // f(x) = 3x - cos(x) - 1
  4. double f(double x) {
  5.     return 3*x - cos(x) - 1;
  6. }
  7.  
  8. signed main() {
  9.     ios_base::sync_with_stdio(false); cin.tie(NULL);
  10.     int iter = 0, max_iter = 100;
  11.     double tol = 0.0001;
  12.     cout << "Iter\tRoot\n";
  13.     // initial guesses
  14.     double x0 = 0, x1 = 1, x2;
  15.     do {
  16.         x2 = (x0*f(x1) - x1*f(x0)) / (f(x1) - f(x0));
  17.         cout << ++iter << "\t" << x2 << endl;
  18.         if (fabs(f(x2)) < tol) {
  19.             break;
  20.         }
  21.         x0 = x1;
  22.         x1 = x2;
  23.         if (iter > max_iter) {
  24.             cout << "Max iterations reached\n";
  25.             break;
  26.         }
  27.     } while (fabs(x1 - x0) > tol);
  28. }
Success #stdin #stdout 0s 5288KB
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stdin
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Standard input is empty
stdout
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Iter	Root
1	0.578085
2	0.605959
3	0.607106
https://ideone.com/gwWCoz
Secant
language:
C++14 (gcc 8.3)
created:
4 days ago
visibility:
public

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