程序代码：

#include"iostream.h"
#include"math.h"
int jiecheng(int x)
{
    int j,k;
    for(j=1,k=1;j<=x;j++)
        k=k*j;
    return k;
}
double fun(double x,double eps=1e-6)
{
    double s;
    int i;
    for(i=1,s=x;pow(x,2*i+1)/jiecheng(2*i+1)>eps;i++)
    {
        s=s+pow(-1,i)*pow(x,2*i+1)/jiecheng(2*i+1);
    }
    s=s+pow(-1,i)*pow(x,2*i+1)/jiecheng(2*i+1);
    return s;
}
void main()
{
    double x;
    cout<<"Input x please    x=";
    cin>>x;
    cout<<'\n'<<fun(x)<<'\n';
}