程序代码：

#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#define N 100
#define D 100

int main(void)
{
    char a[N] = {'\0'};
    char *p[D] = {NULL};
    int i = 0;
    int m = 0;
    double n = 0.0;

    printf("请输入任意个浮点数，再一次按回车结束：\n");

    while((*fgets(a, N, stdin) != '\n') && i < N)
    {
        p[i] = (char *)malloc(strlen(a) + 1);
        if(p[i] == NULL)
        {
            printf("内存不足！\n");
            return 1;
        }
        strcpy(p[i++], a);
    }
    m = i;
    for(i = 0; i < m; i++)
    {
        n = n + atof(p[i]);
        free(p[i]);
        p[i] = NULL;
    }
    printf("平均值是：%lf\n", n/((double)m));
    
    return 0;
}