sin(x)的实现

#include<iostream>using namespace std;

//定义为double类型，防止溢出。double GetValue1(int k){if(k==0 || k==1)return 1;else return k*GetValue1(k-1);}double GetValue2(int k,double x){double temp=1.0;for(int i=0;i<2*k+1;i++)temp=temp*x;double temp2=GetValue1(2*k+1);if(k%2==0)temp=temp/temp2;else temp=0-temp/temp2;return temp;}double Sin(double x){static int k=0;double temp=GetValue2(k,x);if(temp>-0.00001 && temp<0.00001)return temp;else {k++;return temp+Sin(x);}}void main(){double pi=3.14;cout<<Sin(pi/4)<<endl;}