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  1. #include <iostream>
  2. #include <cmath>
  3.  
  4. using namespace std;
  5.  
  6. double fpokh(double x) {
  7.     return 2*x-6;
  8. }
  9.  
  10. int main() {
  11.  
  12.     std::ios_base::sync_with_stdio(false);
  13.     std::cin.tie(NULL);
  14.  
  15.     double a = 1;
  16.     double b = 5;
  17.     double c;
  18.     double e = 0.001;
  19.     int k = 0;
  20.  
  21.  
  22.     while (abs(b - a) > e) {
  23.         c = (a + b) / 2.0;
  24.         k++;
  25.  
  26.         double der = fpokh(c);
  27.  
  28.         if (der == 0.0) {
  29.             a = c;
  30.             b = c;
  31.             break;
  32.         } else if (der > 0) {
  33.             b = c;
  34.         } else {
  35.             a = c;
  36.         }
  37.     }
  38.  
  39.     double xmin = (a + b) / 2.0;
  40.     cout << xmin << " " << k << '\n';
  41.  
  42.     return 0;
  43. }
  44.  
Success #stdin #stdout 0s 5316KB
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3 1
https://ideone.com/GiHdcx
language:
C++14 (gcc 8.3)
created:
6 days ago
visibility:
public

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