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  1. #include <iostream>
  2. #include <utility>
  3. #include <cmath>
  4. using namespace std;
  5.  
  6. double compute_by_rectangle_method(double from, double to, double precision, double (*func)(double) ) {
  7.   if(to < from){
  8.     return compute_by_rectangle_method(to, from, precision, func);
  9.   }
  10.   double accumulator = 0.0;
  11.   for(double i = from + precision; i < to; i += precision) {
  12.     accumulator += func(i);
  13.   }
  14.   return accumulator * precision;
  15. };
  16.  
  17. int main() {
  18.   double from = 0.0;  //prompt_for_double("Enter lower limit of integral: ");
  19.   double to = 1000.0; //prompt_for_double("Enter upper limit of integral: ");
  20.   double result = compute_by_rectangle_method(from, to, 1.0, [](double x){
  21.   	return std::sin(x) + std::sqrt(x) * std::cos(x/3);
  22.   });
  23.   cout << result;
  24.   return 0;
  25. }
Success #stdin #stdout 0s 3140KB
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https://ideone.com/hFxuu2
language:
C++14 (gcc 8.3)
created:
9 years ago
visibility:
secret

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