# include <stdio.h>
# include <malloc.h>

struct student
{
    int age;
    char name;
    float score;
};

int main(void)
{
    int len;
    struct Student * pArr;
    int i;
    //动态构造一维数组

    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个学生的信息是：\n", i+1);
        printf("age:%d\n", pArr[i].age);
        printf("name:%s\n", pArr[i].name);
        printf("score:%f\n", pArr[i].score);
    }

    return 0;
}

struct student
{
    int age;
    char name;
    float score;
};
struct Student * pArr;
结构体名字不匹配吧

C语言对大小写是敏感的

// luntan.cpp : Defines the entry point for the console application.
//

#include "stdafx.h"
#include "stdio.h"
#include "malloc.h"
#include "string.h"
//c语言中严格区分大小写，你的结构体名与声明时的不一致，都必须是大写
struct Student
 {
     int age;
     char name[2];//必须是字符数组的才能进行字符串的输出输入
     float score;
 };
 
int main(void)
 {
     int len;
     struct Student * pArr;
     int i;
     //动态构造一维数组
 
    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个学生的信息是：\n", i+1);
         printf("age:%d\n", pArr[i].age);
         printf("name:%s\n", pArr[i].name);
         printf("score:%f\n", pArr[i].score);
     }

    return 0;
 }