快点帮帮忙！！！

[point_to]

求个积分：

e的cos(a)次方*d(sin(a))的积分！！！！！！a为角度。d为微分符号！

[arfi]

sin(a)*exp(cos(a))

[boyfling]

去找个求积分的源码吧

[snipersu]

#include <iostream>
#include <cmath>
using namespace std;
class Integral_Base
{
protected:
double delta;
double consequence;
double lower;
double higher;
public:
Integral_Base(double low,double high,double del=0.01):lower(low),higher(high)
,delta(del),consequence(0)
{
}
//x should be radian.
virtual double fun(double x)=0;
virtual double calculate()
{

for(double i=lower;i<higher;i+=delta)
{
consequence+=(fun(i) * delta);
}
return consequence;
}
};
class MyIntegral:public Integral_Base
{
public:
MyIntegral(double low,double high,double del=0.01)
:Integral_Base(low,high,del)
{}
virtual double fun(double x)
{
return sin(x)*exp(cos(x));
}
};
void main()
{
MyIntegral a(0,3.1416);
cout<<a.calculate();
}

[snipersu]

//我这里的是弧度的,如果用角度的话那你自己转化一下吧!
//派生类要提供自己的fun(double,dobule,double).

//网络不好,回贴真困难!

[point_to]

谢了，怪我没有说清楚，我要的不是程序实现，
我要的就是一个数学答案！！