程序代码：

#include<stdio.h>
#include<malloc.h>
struct Student
{
    char name[100];
    int age;
    float score;
};
int main(void)
{
    int len;
    int i;
    struct Student *p;
    p=(struct Student *)malloc(len*sizeof(struct Student));
    printf("请输入一共有几位学生:");
    scanf("%d",&len);
    for(i=0;i<len;++i)
    {
        printf("请输入第%d位同学的信息:\n",i+1);
        printf("name:");
        scanf("%s",p[i].name);

        printf("age:");
        scanf("%f",&p[i].age);

        printf("score:");
        scanf("%g",&p[i].score);
       
    }
        for(i=0;i<len;++i)
    {
        printf("请输出第%d位同学的信息:\n",i+1);
        printf("name:\n",p[i].name);

        printf("age:\n",&p[i].age);

        printf("score:\n",&p[i].score);
       
       
    }
        return 0;


}

程序代码：

#include<stdio.h>
#include<malloc.h>
struct Student
{
    char name[100];
    int age;
    float score;
};
int main(void)
{
    int len;
    int i,j;
    struct Student st;
    struct Student *p;

    printf("请输入一共有几位学生:");
    scanf("%d",&len);
    p=(struct Student *)malloc(len*sizeof(struct Student));
    //输入
    for(i=0;i<len;++i)
    {
        printf("请输入第%d位同学的信息:\n",i+1);
        printf("name:");
        scanf("%s",&(p+i)->name);

        printf("age:");
        scanf("%d",&p[i].age);

        printf("score:");
        scanf("%f",&p[i].score);
       
    }
    //按成绩进行排序
    //冒泡排序
    for(i=0;i<len-1;++i)
    {
        for(j=0;j<len-i-1;++j)
        {
            if(p[j].score<p[j+1].score)
            {
                st=p[j];
                p[j]=p[j+1];
                p[j+1]=st;

            }
        }
    }
    printf("\n\n");
    printf("学生的信息如下\n");

    //输出
    for(i=0;i<len;++i)
    {
        printf("请输出第%d位同学的信息:\n",i+1);
        printf("name:%s\n",p[i].name);

        printf("age:%d\n",p[i].age);

        printf("score:%f\n",p[i].score);
       
       
    }
        return 0;


}