基础编程练习错误集

printf();我居然把他放到了头文件下，我有罪><

 double f( int n, double a[], double x )
   {
   
   double sum,s=0,t=1;
    for(int i=0;i<=n;i++)
    {
        for(int j = 0;j<=i;j++)
        {
            t*=x;
        }
        s=a[i]*t;
        printf("%lf",double(s));
        t=1;
        sum+=s;
    }
    
}
#include <stdio.h>

#define MAXN 10

int main()
{
    int n, i;
    double a[MAXN], x;
    
    scanf("%d %lf", &n, &x);
    for ( i=0; i<=n; i++ )
        scanf("%lf", &a[i]);
    printf("%.1f\n", f(n, a, x));
    return 0;
}

发出来记录脑残时刻！！！