#include
#include
#include
Double Sum4 (DOUBLE); // Function Declaration
Double Sum2 (double);
Double f (double);
//
void main ()
{
Double Sn, S2n, H, Result, A, B
Double EPS;
Int n;
Cout << "Please enter a =";
CIN >> A;
Cout << "Please enter b =";
CIN >> B;
Cout << "Please enter EPS (such as: If you enter 7, it is indicated as 10 ^ -7) =";
CIN >> EPS;
IF (A> B || EPS <0) Return;
EPS = POW (10, -EPS); // Accuracy
H = b-a;
n = (int) ((b-a) / h);
SN = H / (6 * n) * (f (a) 4 * SUM4 (H) 2 * Sum2 (H) f (b));
While (h> 0)
{
H / = 2;
S2n = h / (6 * n) * (f (a) 4 * SUM4 (H) 2 * Sum2 (H) f (b));
IF ((FABS (S2n-Sn) / 15)> EPS) SN = S2n;
Else
{
Result = S2n; // Exit circulatory conditions
Break;
}
}
Cout << "The result is" << setPrecision (9) << result << Endl << "h size =" << h << Endl;
}
//
Double F (double x) // function f (x) expression
{
Return (Exp (-x * x));
}
//
Double Sum4 (Double H) // Composite SIMPSON formula is 4 results
{
INT N, I;
Double Sum = 0;
n = (int) (1 / h);
For (i = 0; i SUM = f ((i 0.5) * h); Return SUM; } // Double Sum2 (Double H) // Composite SIMPSON formula is 2 results { INT N, I; Double Sum = 0; n = (int) (1 / h); For (i = 1; i SUM = f (i * h); Return SUM; }
