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  1. #include <iostream>
  2. #include <cmath>
  3. #include <iomanip>
  4. using namespace std;
  5.  
  6. double f(double x) {
  7.     return x*x*x - x - 2;
  8. }
  9.  
  10. int main() {
  11.     double x1, x2, x3, f1, f2, tolerance;
  12.     int iteration = 0, max_iterations = 1000;
  13.  
  14.     cout << "Enter the value of x1: ";
  15.     cin >> x1;
  16.     cout << "Enter the value of x2: ";
  17.     cin >> x2;
  18.     cout << "Enter tolerance value: ";
  19.     cin >> tolerance;
  20.  
  21.     cout << "\nIteration\t x1\t\t x2\t\t x3\t\t f(x1)\t\t f(x2)\n";
  22.     cout << fixed << setprecision(6);
  23.  
  24.     do {
  25.         f1 = f(x1);
  26.         f2 = f(x2);
  27.  
  28.         if (fabs(f2 - f1) < 1e-12) {
  29.             cout << "ভাগফল শূন্যের কাছাকাছি, গণনা করা যায় না।" << endl;
  30.             break;
  31.         }
  32.  
  33.         x3 = (f2 * x1 - f1 * x2) / (f2 - f1);
  34.         double fx3 = f(x3);
  35.  
  36.         cout << iteration + 1 << "\t\t " << x1 << "\t " << x2 << "\t " << x3
  37.              << "\t " << f1 << "\t " << f2 << endl;
  38.  
  39.         x1 = x2;
  40.         x2 = x3;
  41.         f1 = f2;
  42.         f2 = fx3;
  43.  
  44.         iteration++;
  45.  
  46.         if (iteration >= max_iterations) {
  47.             cout << "সমাধান নির্ধারিত সংখ্যক ধাপে সন্নিকটে পৌঁছায়নি।" << endl;
  48.             break;
  49.         }
  50.  
  51.     } while (fabs(f(x3)) > tolerance);
  52.  
  53.     if (fabs(f(x3)) <= tolerance) {
  54.         cout << "\nApproximate root = " << x3 << endl;
  55.     }
  56.  
  57.     return 0;
  58. }
  59.  
Success #stdin #stdout 0s 5312KB
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stdin
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x0=1
x1=2
stdout
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Enter the value of x1: Enter the value of x2: Enter tolerance value: 
Iteration	 x1		 x2		 x3		 f(x1)		 f(x2)
ভাগফল শূন্যের কাছাকাছি, গণনা করা যায় না।
https://ideone.com/fQuA4I
language:
C++14 (gcc 8.3)
created:
12 days ago
visibility:
public

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