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  1. #include <iostream>
  2. #include <math.h>
  3. using namespace std;
  4. 	double f(double x){return (-3*x*x+2*x+9);}
  5. 	double I(double a,double b,int n,double y){return ((b-a)/(2*n)*y);}
  6. int main() {
  7. 	int n; double a,b,y,dy,In;
  8. 	cin>>a>>b>>n;
  9. 	if (n>1){
  10. 		dy=(b-a)/n;
  11. 		y+=f(a)+f(b);
  12. 		for (int i=1; i<n; i++) {y+=2*(f(a+dy*i));}
  13. 		In=I(a,b,n,y);
  14. 		cout << In;
  15. 	}
  16. 	else {cout << "Wrong data";}
  17. }
Success #stdin #stdout 0s 3416KB
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https://ideone.com/RJpYSw
Определенный интеграл
language:
C++14 (gcc 8.3)
created:
8 years ago
visibility:
secret

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