#include<stdio.h>
#include<malloc.h>  
  struct student
  {
      int age;
       char score;         
       char name[100];
       };
int main(void)
{
    int len;                                       
    struct student * parr;
    int i;
    printf("请输入学生个数:\n");
    printf("len= ");
    scanf("%d",&len);
    parr=(struct student*)malloc(len * sizeof(struct student));   

    for(i=0;i<len;i++)
    {
        printf ("请输入第%d个学生的信息:",i+1);
        printf("age=");
        scanf("%d",&parr[i].age);
        printf("name=");
        scanf("%s",parr[i].name);
        printf("score=");
        scanf("%f",&parr[i].score);

}
    for(i=0;i<len;i++)
    {
          printf ("第%d个学生的信息:\n",i+1);
        printf("age=%d\n",parr[i].age);
        printf("name=%s\n" ,parr[i].name );
        printf("score=%f\n" ,parr[i].score);
        printf("\n");
    }

}

struct student
{
    int age;
    float score;//!!!!!!!!!!
    char name[100];
};

感谢