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  1. #include <iostream>
  2. #include<iomanip>
  3. using namespace std;
  4.  
  5. double f(double x)
  6. {
  7. 	return (2*x*x*x-7*x+4);
  8. }
  9. int main() 
  10. {
  11. 	double a,b;
  12. 	int n;
  13. 	cin>>a>>b>>n;
  14. 	double s=(f(a)+f(b))/2;
  15. 	double h=(b-a)/n;
  16. 	for (int i=1; i<=n-1; i++)
  17. 	{ 
  18. 		s+=f(a+i*h);
  19. 	}
  20. 	double I=h*s;
  21.  
  22. 	cout<<setprecision(10)<<I<<endl;
  23.  
  24. 	return 0;
  25. }
Success #stdin #stdout 0s 3432KB
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0 2 5000
stdout
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2.00000032
https://ideone.com/ELtpHt
analysis
language:
C++14 (gcc 8.3)
created:
10 years ago
visibility:
public

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