/*试题描述函数接口定义：double f( int n, double a[], double x );其中n是多项式的阶数，a[]中存储系数，x是给定点。函数须返回多项式f(x)的值。裁判测试程序样例：#include <stdio.h>#define MAXN 10double f( int n, double a[], double x );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;}输入第一行是多项式的阶数和x的值，第二行是各个系数的值输出多项式f(x)的值样例输入2 1.11 2.5 -38.7样例输出-43.1*/#include<stdio.h>#define MAXN 10double f(int n,double a[],double x);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;} double f(int n,double a[], double x){ double sum; int i; for(i = 0; i <= n; i++) sum += a[i] * pow(x,i); //可利用函数指针调用pow函数 return sum;}