程序代码：

/*
动态输入学生个数，并输入姓名，学号，和一门成绩！
*/
#include "stdio.h"
#include "stdlib.h"
struct STUDENT
{
    int number;
    char name[15];
    int score;
};
int main()
{
    int i = 0, n;
    printf("Hello World!\n");
    struct STUDENT *p;//这要不要用*p=NULL
    printf("Please enter n:");
    scanf("%d", &n);
    p=(struct STUDENT *)malloc(sizeof(struct STUDENT)*n);
    if(p==NULL)
    {
        printf("No enough memory!\n");
        exit(0);
    }
    for(i=0; i < n; i++)
    {
        printf("Please enter the student's number:");
        scanf("%d", &(p+i)->number);
        printf("Please enter the student's name:");
        scanf("%s", &(p+i)->name);
        printf("Please enter the student's score:");
        scanf("%d", &(p+i)->score);
    }
    for(i=0; i < n; i++)
    {
        printf("姓名:%s\n", (p+i)->name);
        printf("学号:%d\n", (p+i)->number);
        printf("成绩:%d\n", (p+i)->score);
    }
    free(p);
    return 0;
}