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#2
m21wo2010-09-28 21:17
帮你一下！呵呵！
 程序代码：#include <iostream> #include <cmath> #include <iomanip> using namespace std; int main() { cout<<setprecision(15); cout<<"input x="; double x; cin>>x; cout<<"input required precision:"; double prec; cin>>prec; double precp; double i=0; double result=0; do { double temp=1; for(int j=1;j<=(i+i+1);j++) temp*=x/j; temp=temp*pow(-1,i); result+=temp; i++; precp=fabs(temp); }while(precp>prec); cout<<"利用泰勒展开式得sin(x)为："<<endl; cout<<result<<endl; cout<<"直接调用cmath库里函数sin(x)为："<<endl; cout<<sin(x)<<endl; cout<<"泰勒展开式n值为："<<endl; cout<<i<<endl; cout<<"在精度下泰勒展开式最后一项为:"<<endl; cout<<precp<<endl; return 0; } |
急求个三角函数的编程...就是sin(x)=..........就是（-1）的i次方再乘以x的（2i+1）次方..最后除以（2i+1）的阶乘....谢谢了..我要交给老师的..作业来的
#include <iostream>
#include <cmath>
#include <iomanip>
using namespace std;
int main()
{
cout<<setprecision(15);
cout<<"input x=";
double x;
cin>>x;
cout<<"input required precision:";
double prec;
cin>>prec;
double precp=1e100;
int i=0;
double result=0;
do
{
double temp=1;
for(int j=1;j<=(i+i+1);j++)
{
temp*=x/j;
}
result+=temp;
i++;
precp=fabs(temp);
}while(precp>prec);
cout<<result<<endl;
cout<<exp(x)<<endl;
cout<<i<<endl;
cout<<precp<<endl;
return 0;
}
怎么改才对啊.....帮帮忙..