2004年秋浙江省计算机等级考试二级C 编程题(2)-题解(C语言代码)

# include <stdio.h>
double fact (int n);
double mypow (double x,int n);
int main ()
{
    int n,i,a=-1;
    double x,s=0,sum=0;
    scanf ("%lf %d",&x,&n);
     for (i=1;i<=n;i++)
     {
         s=mypow (-1,i-1)*mypow (x,i)/fact (i);
         sum+=s;
     }
    printf ("%0.4lf",sum);
    return 0;
}
double fact (int n)
{
    int i;
    double j=1,sum=0;
    for (i=1;i<=n;i++)
    {
        j*=i;
    }
    return j;
}
double mypow (double x,int n)
{
    int i;
    double y=1;
    for (i=1;i<=n;i++)
    {
        y*=x;
    }
    return y;
}