#include<stdio.h>

const double min=0.0001;
float Item(double n)
{
    double Mul;
    Mul=1;
    for(double i=1;i<=n;i++)
    {
        Mul=Mul*i;
    }
    return double(1/Mul);
}
main()
{
    double e=1,i=1;

    while(Item(i)>min)
    {   
        e=e+Item(i);
        cout<<Item(i)<<endl;
        i++;
    }
    cout<<"e="<<e<<endl;
}

#include<stdio.h>
const double min=0.0001;
float Item(double n)
{
    double Mul,i;
    Mul=1;
    for(i=1;i<=n;i++)
    {
        Mul=Mul*i;
    }
    return (double)1/Mul;   // C和C++有区别
}
main()
{
    double e=1,i=1;

    while(Item(i)>min)
    {   
        e=e+Item(i);
        printf("%lf\n",Item(i));
        i++;
    }
printf("e=%lf\n",e);
}