?? d3r2.cpp
字號:
#include "iostream.h"
#include "math.h"
double func(double x)
{
return pow(x, 2) * (pow(x,2) - 2.0) * sin(x);
}
double fint(double x)
{
//integral of func
double aaa;
aaa = 4.0 * x * (pow(x,2) - 7.0) * sin(x);
return aaa - (pow(x , 4) - 14.0 * pow(x , 2) + 28.0) * cos(x);
}
void main()
{
//program d3r2
//driver for routine qtrap
double pio2 = 1.5707963;
double s, b,a = 0.0;
b = pio2;
cout<<endl;
cout<<"integral of func computed with qtrap"<<endl;
cout<<endl;
cout<<"actual value of integral is:";
cout<<(fint(b) - fint(a))<<endl;
cout<<endl;
qtrap(a, b, s);
cout<<"result from routine qtrap is:";
cout<<s<<endl;
}
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